Flow-induced vibration test device, method, computer device, storage medium and product

Abstract

The application relates to a flow-induced vibration test device, a method, a computer device, a storage medium and a product. The device comprises a flow channel groove, a test simulation body and a collection device. The flow channel groove comprises a fluid inlet section, a fluid mixing section, a test section and a fluid outlet section which are sequentially connected. The fluid mixing section is used for mixing the fluid flowing from the fluid inlet section to generate mixed fluid. The mixed fluid flows through the test section and flows out from the fluid outlet section. The test simulation body comprises a plurality of non-linear heat transfer pipes and a support assembly. The support assembly is used for fixedly mounting the plurality of non-linear heat transfer pipes in the test section. The collection device is arranged on the plurality of non-linear heat transfer pipes and is used for collecting test data when the plurality of non-linear heat transfer pipes flow-induced vibration occurs when the mixed fluid flows into the test section. The flow-induced vibration test device can ensure that the large natural circulation heat exchanger can safely operate in actual production by cooperating the plurality of non-linear heat transfer pipes with the support assembly.

Description

Technical Field

[0001] This application relates to the field of flow-induced vibration analysis technology for heat exchanger tube bundle regions, and in particular to a flow-induced vibration testing apparatus, method, computer equipment, storage medium, and product. Background Technology

[0002] Large-scale natural circulation heat exchangers are large devices that transfer a portion of the heat from a hot fluid to a cold fluid, primarily ensuring the required temperature during operation. Heat transfer tubes are installed in the tube bundle region of a large-scale natural circulation heat exchanger. These tubes not only exchange heat between the media on both sides of the tube and shell but also serve as pressure boundaries for the reactor cooling system, containing radioactive materials. Therefore, the structural integrity of the heat transfer tubes is crucial to the safe operation of the entire heat exchanger. During steady-state operation of a large-scale natural circulation heat exchanger, if the shell-side fluid laterally scours the heat transfer tubes, excessive flow-induced vibration will occur, leading to damage. Therefore, a flow-induced vibration testing device needs to be designed to verify the safety margin of the heat transfer tubes in a large-scale natural circulation heat exchanger during flow-induced vibration.

[0003] Traditional techniques typically simplify the heat transfer tubes and their supporting structures, and then design flow-induced vibration testing devices based on these simplified components. However, in actual production, the heat transfer tubes and their supporting structures used in large natural circulation heat exchangers are quite complex. Therefore, because traditional flow-induced vibration testing devices use simplified heat transfer tubes and supporting structures to simulate flow-induced vibration, they cannot accurately simulate the flow-induced vibration behavior of heat transfer tubes in actual production.

[0004] Therefore, using traditional flow-induced vibration testing devices cannot accurately verify the safety margin of heat transfer tubes in large natural circulation heat exchangers when flow-induced vibration occurs. Consequently, it cannot be guaranteed that large natural circulation heat exchangers can operate safely in actual production. Summary of the Invention

[0005] Therefore, it is necessary to provide a flow-induced vibration testing device, method, computer equipment, storage medium, and product that can ensure the safe operation of large-scale natural circulation heat exchangers in actual production, addressing the aforementioned technical problems.

[0006] In a first aspect, this application provides a flow-induced vibration testing apparatus. The apparatus includes: a flow channel, a test simulation body, and data acquisition equipment;

[0007] The flow channel includes a fluid inlet section, a fluid mixing section, a test section, and a fluid outlet section connected in sequence; the fluid mixing section is used to mix the fluid flowing in from the fluid inlet section to generate a mixed fluid; the mixed fluid flows through the test section and flows out from the fluid outlet section;

[0008] The test simulation body includes multiple non-linear heat transfer tubes and a support assembly, the support assembly being used to fix the multiple non-linear heat transfer tubes in the test section;

[0009] The data acquisition device is installed on the multiple non-linear heat transfer tubes and is used to collect test data when the multiple non-linear heat transfer tubes undergo flow-induced vibration as the mixed fluid flows into the test section.

[0010] In one embodiment, the support component includes a base plate;

[0011] The base plate is connected to the outer shell of the test section; a first through hole is opened on the base plate, and a heat transfer tube fixing assembly is provided on the base plate; the mixed fluid flows from the fluid mixing section into the test section through the first through hole; the two ends of the multiple non-linear heat transfer tubes are connected to the base plate through the heat transfer tube fixing assembly.

[0012] In one embodiment, the support assembly further includes a support plate;

[0013] The support plate is connected to the outer shell of the test section, and the support plate is located between the bottom plate and the fluid outlet section. The support plate is disposed on the straight section of the non-linear heat transfer tube. A second through hole is opened on the support plate, through which the mixed fluid flows into the fluid outlet section, and the multiple non-linear heat transfer tubes pass through the second through hole and are clearance-fitted with the second through hole on the support plate.

[0014] In one embodiment, the support assembly further includes a vibration damping assembly and a fixing assembly;

[0015] The vibration damping component is V-shaped and installed in the bend section of the non-linear heat transfer tube; a third through hole is opened at each end of the vibration damping component; the number of vibration damping components is at least five sets, and each set of vibration damping components includes at least six layers of vibration damping strips;

[0016] The fixing assembly includes at least five pairs of anti-vibration strip rods, each pair of which passes through a third through hole on a set of anti-vibration components and connects to the outer shell of the test section.

[0017] In one embodiment, the support component further includes a collar;

[0018] The collar is sleeved on the anti-vibration strip tie rod, and the anti-vibration strips of different layers in each group of anti-vibration components are spaced apart by the collar.

[0019] In one embodiment, the acquisition device includes:

[0020] An acceleration sensor is installed on the inner wall of the multiple non-linear heat transfer tubes, on the outer shell of the flow channel, and on the test bench; the acceleration sensor is used to measure the acceleration data of the multiple non-linear heat transfer tubes and the test device.

[0021] A pressure sensor is installed on the outer wall of the target heat transfer tube and at a pressure measuring point outside the multiple non-linear heat transfer tubes to measure the pressure data of the multiple non-linear heat transfer tubes and the fluid outside the multiple non-linear heat transfer tubes; the distance between the target heat transfer tube and the support assembly meets a preset distance condition.

[0022] A temperature sensor is installed on the external outlet pipe connected to the fluid outlet section to measure the temperature data of the entire test circuit.

[0023] A flow detection sensor is installed in the fluid inlet section and the fluid mixing section to detect the flow rate of the fluid entering the fluid inlet section and the flow rate of the fluid entering the fluid mixing section.

[0024] In one embodiment, the fluid mixing section includes a first mixing section and a second mixing section connected in sequence; a first fluid flows into the first mixing section through a fluid inlet section; the first mixing section includes a second fluid inlet pipe, through which the second fluid flows into the first mixing section, and mixes with the first fluid in the first mixing section to generate an intermediate mixed fluid;

[0025] The second mixing section includes a packing layer. The intermediate mixing fluid flows from the first mixing section into the second mixing section and is mixed through the packing layer to generate the mixed fluid.

[0026] In one embodiment, the fluid inlet section includes a first fluid inlet pipe, a fourth through hole, and a baffle plate;

[0027] The first fluid flows into the test device through the first fluid inlet pipe; the fourth through hole is opened at one end of the first fluid inlet pipe, and the first fluid flows into the first mixing section through the fourth through hole; the baffle plate is disposed on one side of the fourth through hole to make the flow rate of the first fluid evenly distributed.

[0028] In one embodiment, the experimental simulator further includes an observation window;

[0029] The observation window is located on the outer shell of the test device in the fluid mixing section and the test section, and is used to observe the mixing of the first fluid and the second fluid.

[0030] In one embodiment, the support plate includes a first support plate and a second support plate;

[0031] The first support plate and the second support plate are arranged sequentially in the test section, and both the first support plate and the second support plate are arranged in the straight pipe section of the multiple non-linear heat transfer pipes.

[0032] In one embodiment, the non-linear heat transfer tube includes either a U-shaped heat transfer tube or a spiral heat transfer tube.

[0033] Secondly, this application also provides a method for simulating flow-induced vibration tests. The method is applied to the flow-induced vibration testing apparatus in any of the embodiments of the first aspect described above, and the method includes:

[0034] The mixed fluid is controlled to flow into the test section according to preset fluid flow parameters; the preset fluid flow parameters include fluid velocity parameters and fluid cavitation fraction parameters.

[0035] When the mixed fluid flows into the test section, test data of the flow-induced vibration test device is collected by the acquisition device when the flow-induced vibration occurs; the test data includes at least one of acceleration data, strain data, pressure data, temperature data and flow rate data;

[0036] The preset fluid flow parameters and the corresponding test data are analyzed to determine the vibration characteristics of the multiple non-linear heat transfer tubes when flow-induced vibration occurs.

[0037] Thirdly, this application also provides a flow-induced vibration test simulation device. The device includes:

[0038] A mixed fluid inflow module is used to control the mixed fluid to flow into the test section according to preset fluid flow parameters; the preset fluid flow parameters include fluid velocity parameters and fluid cavitation fraction parameters.

[0039] The test data acquisition module is used to acquire test data of the flow-induced vibration test device when the mixed fluid flows into the test section; the test data includes at least one of acceleration data, strain data, pressure data, temperature data and flow rate data;

[0040] The test data analysis module is used to analyze the preset fluid flow parameters and the test data corresponding to the preset fluid flow parameters to determine the vibration characteristics of multiple non-linear heat transfer tubes when flow-induced vibration occurs.

[0041] Fourthly, this application also provides a design method for a flow-induced vibration testing apparatus. The method is applied to the flow-induced vibration testing apparatus in any of the embodiments of the first aspect described above, and the method includes:

[0042] Obtain an initial model of the flow-induced vibration test device; the initial model includes an initial flow channel and an initial test simulation body, the initial test simulation body includes multiple non-linear heat transfer tubes and support components;

[0043] Flow-induced vibration analysis and flow field analysis are performed on the initial model to determine the first initial parameters of the initial flow channel and the multiple non-linear heat transfer tubes. The first initial parameters are the parameters of the initial flow channel and the multiple non-linear heat transfer tubes when the initial model meets the preset envelope requirement and the flow field of the initial model meets the preset flow field requirement.

[0044] Assign the first initial parameters to the initial flow channel and the multiple non-linear heat transfer tubes in the initial model to generate a first intermediate model. Perform stress analysis on the first intermediate model to determine the second initial parameters of the support components in the first intermediate model that meet the preset stress conditions.

[0045] The second initial parameters are assigned to the support components in the first intermediate model to obtain the second intermediate model. A fluid mixing experiment is conducted on the second intermediate model to determine the third initial parameters of the initial flow channel in the second intermediate model that meet the preset fluid mixing experiment conditions.

[0046] The flow-induced vibration test device is generated based on the first initial parameters of the initial flow channel and the multiple non-linear heat transfer tubes, the second initial parameters of the support assembly, and the third initial parameters of the initial flow channel.

[0047] Fifthly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the method described in the second aspect above.

[0048] Sixthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, implements the steps of the method described in the second aspect above.

[0049] In a seventh aspect, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the steps of the method described in the second aspect above.

[0050] The aforementioned flow-induced vibration testing apparatus, method, computer equipment, storage medium, and product include a flow channel, a test simulator, and a data acquisition device. The flow channel includes a fluid inlet section, a fluid mixing section, a test section, and a fluid outlet section connected in sequence. The fluid mixing section is used to mix the fluid flowing in from the fluid inlet section to generate a mixed fluid. The mixed fluid flows through the test section and exits from the fluid outlet section. The test simulator includes multiple non-linear heat transfer tubes and a support assembly. The support assembly is used to fix the multiple non-linear heat transfer tubes in the test section. The data acquisition device is installed on the multiple non-linear heat transfer tubes and is used to collect test data when the multiple non-linear heat transfer tubes undergo flow-induced vibration as the mixed fluid flows into the test section. The flow-induced vibration testing device in this application is designed using multiple non-linear heat transfer tubes with a complexity similar to those in actual production. These multiple non-linear heat transfer tubes can accurately simulate the non-linear heat transfer tube structure in the tube bundle region of a large-scale natural circulation heat exchanger in actual production, thus accurately simulating the flow-induced vibration of fluids in actual production. Furthermore, the support assembly strengthens the support structure of the multiple non-linear heat transfer tubes, and the cooperation between the flow channel grooves and the through holes in the support assembly facilitates the transmission of the mixed fluid, thereby accurately simulating the flow-induced vibration behavior of the heat transfer tubes in the tube bundle region of a large-scale natural circulation heat exchanger in actual production. Moreover, this flow-induced vibration testing device is large in scale and includes a fluid mixing section, enabling uniform mixing of the fluid in the test section. This allows for the verification of flow-induced vibration behavior under high flow rate conditions, thus accurately verifying the safety margin of the heat transfer tubes in a large-scale natural circulation heat exchanger when flow-induced vibration occurs. Consequently, it ensures the safe operation of large-scale natural circulation heat exchangers in actual production. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the flow-induced vibration test apparatus in one embodiment;

[0052] Figure 2 This is a schematic diagram of the structure of the base plate of the flow-induced vibration test device in one embodiment;

[0053] Figure 3 This is a schematic diagram of the support plate of the flow-induced vibration test device in one embodiment;

[0054] Figure 4 This is a schematic diagram of the vibration damping component and fixing component of the flow-induced vibration test device in one embodiment;

[0055] Figure 5 This is a schematic diagram showing the installation of the first accelerometer sensor on the heat transfer tube in another embodiment;

[0056] Figure 6 This is a schematic diagram of the wiring of the first accelerometer on the heat transfer tube in another embodiment;

[0057] Figure 7 This is a schematic diagram showing the installation of the second acceleration sensor on the test apparatus in another embodiment;

[0058] Figure 8 This is a schematic diagram of the installation of the second acceleration sensor on the support frame in another embodiment;

[0059] Figure 9 This is a schematic diagram showing the installation of the first pressure sensor on the heat transfer tube in another embodiment;

[0060] Figure 10 This is a schematic diagram of the wiring of the first pressure sensor on the heat transfer tube in another embodiment;

[0061] Figure 11 This is a schematic diagram showing the installation positions of the first acceleration sensor and the first pressure sensor in another embodiment;

[0062] Figure 12 This is a schematic diagram showing the installation of a second pressure sensor on a heat transfer tube in another embodiment;

[0063] Figure 13 This is a schematic diagram of the fluid mixing section of a flow-induced vibration test apparatus in one embodiment;

[0064] Figure 14 This is a schematic diagram of the structure of the fourth through hole in the fluid inlet section in one embodiment;

[0065] Figure 15 This is a diagram illustrating the application environment of the flow-induced vibration test simulation method in one embodiment;

[0066] Figure 16 This is a flowchart illustrating a flow-induced vibration test simulation method in one embodiment;

[0067] Figure 17 This is a flowchart illustrating the design method of a flow-induced vibration testing device in one embodiment;

[0068] Figure 18 This is a schematic diagram of the tube array size in the pre-analysis of the flow field in one embodiment;

[0069] Figure 19 This is a schematic diagram of the inter-tube velocity distribution in the heat transfer tubes of a test section in one embodiment;

[0070] Figure 20 This is a schematic diagram of the location of the heat transfer tube that needs to be measured in the high flow rate region in one embodiment;

[0071] Figure 21 This is a comparison diagram of the inter-tube flow velocity under certain test conditions and the steady-state operation of the actual product on a certain heat transfer tube in one embodiment.

[0072] Figure 22 This is a comparison diagram of the fluid dynamic pressure under certain test conditions and the steady-state operation of the actual product on a heat transfer tube in one embodiment.

[0073] Figure 23 This is a schematic diagram of the structure of a fluid mixing module performance test simulator in one embodiment;

[0074] Figure 24 This is a schematic diagram of the installation of a fluid mixing module performance test simulator in one embodiment;

[0075] Figure 25 This is a structural block diagram of a flow-induced vibration test simulation device in one embodiment;

[0076] Figure 26 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0077] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0078] Large-scale natural circulation heat exchangers are large devices that transfer a portion of the heat from a hot fluid to a cold fluid, primarily ensuring the required temperature during operation. Heat transfer tubes are installed in the tube bundle region of a large-scale natural circulation heat exchanger. These tubes not only exchange heat between the media on both sides of the tube and shell but also serve as pressure boundaries for the reactor cooling system, containing radioactive materials. Therefore, the structural integrity of the heat transfer tubes is crucial to the safe operation of the entire heat exchanger. During steady-state operation of a large-scale natural circulation heat exchanger, if the shell-side fluid laterally scours the heat transfer tubes, excessive flow-induced vibration will occur, leading to damage. Therefore, a flow-induced vibration testing device needs to be designed to verify the safety margin of the heat transfer tubes in a large-scale natural circulation heat exchanger during flow-induced vibration.

[0079] In traditional techniques, heat transfer tubes and their supporting structures are typically simplified, and flow-induced vibration testing devices are designed based on these simplified structures. However, in actual production, the heat transfer tubes and their supporting structures used in large natural circulation heat exchangers are quite complex. Therefore, because traditional flow-induced vibration testing devices use simplified heat transfer tubes and supporting structures to simulate flow-induced vibration, they cannot accurately simulate the flow-induced vibration behavior of non-linear heat transfer tube structures (such as inverted U-shaped heat transfer tube bends) in actual production. Inverted U-shaped heat transfer tubes are a common structural form in large natural circulation heat exchangers, and the high-risk area for flow-induced vibration in these tubes is mainly concentrated in the bends.

[0080] The heat transfer tubes in traditional flow-induced vibration testing devices are structurally simplified versions of those in large-scale natural circulation heat exchangers used in actual production. Therefore, these devices can only verify the first-order vibration characteristics of the heat transfer tubes during flow-induced vibration, but cannot verify the higher-order vibration characteristics. Firstly, the heat transfer tubes in traditional devices cannot simulate the support structure of real product heat transfer tubes, which is a key factor affecting the flow-induced vibration response. Secondly, the scale of traditional devices is too small to simulate the flow-induced vibration behavior of heat transfer tubes in tube bundles under high flow rates and velocities. Thirdly, the small volume and high fluid resistance of the gas-water mixing section in traditional test bodies cannot meet the verification requirements of large-flow-rate flow-induced vibration tests in actual engineering. Therefore, traditional flow-induced vibration testing devices cannot accurately simulate the flow-induced vibration behavior of heat transfer tubes in actual production.

[0081] Therefore, using traditional flow-induced vibration testing devices cannot accurately verify the safety margin of heat transfer tubes in large natural circulation heat exchangers when flow-induced vibration occurs. Consequently, it cannot be guaranteed that large natural circulation heat exchangers can operate safely in actual production.

[0082] Based on this, this application provides a flow-induced vibration testing device that can ensure the safe operation of large-scale natural circulation heat exchangers in actual production.

[0083] In one embodiment, such as Figure 1 As shown, a flow-induced vibration testing device is provided, which includes: a flow channel, a test simulation body, and a data acquisition device;

[0084] The flow channel includes a fluid inlet section 120, a fluid mixing section 140, a test section 160, and a fluid outlet section 180 connected in sequence; the fluid mixing section 140 is used to mix the fluid flowing in from the fluid inlet section 120 to generate a mixed fluid; the mixed fluid flows through the test section 160 and flows out from the fluid outlet section;

[0085] The test simulation body includes multiple non-linear heat transfer tubes 220 and a support assembly 240. The support assembly 240 is used to fix the multiple non-linear heat transfer tubes in the test section 160.

[0086] The data acquisition device is installed on multiple non-linear heat transfer tubes to collect test data when the mixed fluid flows into the test section 160 and the multiple non-linear heat transfer tubes experience flow-induced vibration.

[0087] The support assembly 240 includes a base plate 242, a support plate 244, a vibration damping assembly 246, a fixing assembly 248, and a collar. The outer shell of the flow-induced vibration test device includes an observation window 131, a reinforcing rib 132, and a flange 133. The observation window 131 is used by the operator to observe the mixing of the first fluid and the second fluid. The reinforcing rib 132 is used to support the outer shell and prevent the device from deforming during the flow-induced vibration process. The flange 133 connects the fluid inlet section 120, the fluid mixing section 140, the test section 160, and the fluid outlet section 180.

[0088] In this embodiment, a flow-induced vibration testing device is provided, including a flow channel, a test simulation body, and a data acquisition device. The flow channel includes a fluid inlet section 120, a fluid mixing section 140, a test section 160, and a fluid outlet section 180 connected in sequence. The fluid mixing section 140 is used to mix the fluid flowing in from the fluid inlet section 120 to generate a mixed fluid. The mixed fluid flows through the test section 160 and flows out from the fluid outlet section 180. The test simulation body includes multiple non-linear heat transfer tubes and a support assembly 240. The support assembly 240 is used to fix the multiple non-linear heat transfer tubes in the test section 160. The data acquisition device is installed on the multiple non-linear heat transfer tubes and is used to collect test data when the multiple non-linear heat transfer tubes undergo flow-induced vibration when the mixed fluid flows into the test section 160. The flow-induced vibration test apparatus in this application is designed using multiple non-linear heat transfer tubes with a complexity similar to those in actual production. These multiple non-linear heat transfer tubes can accurately simulate the non-linear heat transfer tube structure in the tube bundle region of a large natural circulation heat exchanger in actual production, thus accurately simulating the flow-induced vibration of fluids in actual production. Furthermore, the support assembly 240 strengthens the support structure for the multiple non-linear heat transfer tubes. The cooperation between the flow channel groove and the through holes in the support assembly 240 facilitates the transmission of the mixed fluid, thereby accurately simulating the flow-induced vibration behavior of the heat transfer tubes in the tube bundle region of a large natural circulation heat exchanger in actual production. Moreover, this flow-induced vibration test apparatus is relatively large, featuring a fluid mixing section 140, which can achieve uniform mixing of the fluid in the test section 160. This allows for the verification of flow-induced vibration behavior under high flow rate conditions, thus accurately verifying the safety margin of the heat transfer tubes in a large natural circulation heat exchanger when flow-induced vibration occurs. Therefore, it can ensure the safe operation of large natural circulation heat exchangers in actual production.

[0089] In one embodiment, the support assembly 240 includes a base plate 242; the base plate 242 is connected to the outer shell of the test section 160; a first through hole is formed on the base plate 242, and a heat transfer tube fixing assembly 202 is provided on the base plate 242; the mixed fluid flows from the fluid mixing section 140 into the test section 160 through the first through hole; the two ends of multiple non-linear heat transfer tubes are connected to the base plate 242 through the heat transfer tube fixing assembly 202.

[0090] like Figure 2 The diagram shown is a structural schematic of the base plate 242 in the support assembly 240 of the flow-induced vibration test device in one embodiment. The support assembly 240 of the flow-induced vibration test device also includes the base plate 242.

[0091] The base plate 242 includes a first through hole 201, a heat transfer tube fixing assembly 202, and bolt holes 203. Multiple first through holes 201 are provided on the base plate 242 for allowing the mixed fluid to flow from the fluid mixing section 140 into the test section 160 through the first through holes 201. The heat transfer tube fixing assembly 202 is provided on the base plate 242 for welding the two ends of multiple non-linear heat transfer tubes to the base plate 242 via the heat transfer tube fixing assembly 202. Bolt holes 203 are provided on the base plate 242 for connecting flanges, so that the base plate 242 is connected to the outer shell of the test section 160 via flanges.

[0092] In this embodiment, the support assembly 240 includes a base plate 242 with multiple first through holes 201 for allowing the mixed fluid to flow from the fluid mixing section 140 into the test section 160 through the first through holes 201, thus facilitating the transmission of the mixed fluid. A heat transfer tube fixing assembly 202 is provided on the base plate 242 for welding the two ends of multiple non-linear heat transfer tubes to the base plate 242, thereby strengthening the support structure of the multiple non-linear heat transfer tubes. Bolt holes 203 are provided on the base plate 242 for connecting flanges, so that the base plate 242 is connected to the outer shell of the test section 160 through the flanges, thereby enhancing the stability of the flow-induced vibration test device. The interaction of the first through hole 201, the heat transfer tube fixing assembly 202, and the bolt hole 203 on the base plate 242 enables this flow-induced vibration test device to accurately simulate the flow-induced vibration behavior of the heat transfer tubes in the tube bundle region of a large natural circulation heat exchanger in actual production. This allows for accurate verification of the safety margin of the heat transfer tubes in a large natural circulation heat exchanger when flow-induced vibration occurs. Furthermore, it ensures the safe operation of the large natural circulation heat exchanger in actual production.

[0093] In one embodiment, the support assembly 240 further includes a support plate 244; the support plate 244 is connected to the outer shell of the test section 160, and the support plate 244 is located between the base plate 242 and the fluid outlet section 180. The support plate 244 is disposed on the straight section of the non-linear heat transfer tube; a second through hole is opened on the support plate 244, through which the mixed fluid flows into the fluid outlet section 180, and multiple non-linear heat transfer tubes pass through the second through hole and are clearance-fitted with the second through hole on the support plate 244.

[0094] like Figure 3 The diagram shown is a structural schematic of the support plate 244 of a flow-induced vibration testing apparatus in one embodiment. The support assembly 240 of the flow-induced vibration testing apparatus also includes the support plate 244;

[0095] The support plate 244 includes a second through hole 301 and bolt holes 302. The second through hole 301 is provided on the support plate 244, through which the mixed fluid flows into the fluid outlet section 180. The straight sections of multiple non-linear heat transfer tubes pass through the second through hole 301, with a clearance fit to the second through hole 301 on the support plate 244. The bolt holes 302 are provided on the support plate 244 for connecting flanges, allowing the support plate 244 to be connected to the outer shell of the test section 160 via flanges. The support plate 244 is located between the base plate 242 and the fluid outlet section 180, and is positioned on the straight sections of the non-linear heat transfer tubes.

[0096] In this embodiment, the support assembly 240 includes a support plate 244 with a second through hole 301. The mixed fluid flows into the fluid outlet section 180 through the second through hole 301, making the transmission of the mixed fluid more convenient. Straight sections of multiple non-linear heat transfer tubes pass through the second through hole 301, fitting with the second through hole 301 on the support plate 244 with a clearance, strengthening the support structure of the straight sections of the multiple non-linear heat transfer tubes. Bolt holes 302 are provided on the support plate 244 for connecting flanges, allowing the support plate 244 to be connected to the outer shell of the test section 160 via flanges, thus enhancing the stability of the flow-induced vibration test device. The mutual cooperation of the second through hole 301 and bolt holes 302 on the support plate 244 enables the flow-induced vibration test device to accurately simulate the flow-induced vibration behavior of the heat transfer tubes in the tube bundle area of ​​a large natural circulation heat exchanger in actual production, thereby accurately verifying the safety margin of the heat transfer tubes in a large natural circulation heat exchanger when flow-induced vibration occurs. This ensures that large-scale natural circulation heat exchangers can operate safely in actual production.

[0097] In one embodiment, the support component 240 further includes a vibration damping component 246 and a fixing component 248;

[0098] The vibration damping component 246 is V-shaped and installed in the bend section of the non-linear heat transfer tube; a third through hole is opened at both ends of the vibration damping component 246; the number of vibration damping components 246 is at least five sets, and each set of vibration damping components 246 includes at least six layers of vibration damping strips;

[0099] The fixing assembly 248 includes at least five pairs of anti-vibration strip rods, each pair of anti-vibration strip rods passing through a third through hole on a set of anti-vibration assemblies 246 and connected to the housing of the test section 160.

[0100] like Figure 4 The diagram shown is a structural schematic of the vibration damping component 246 and the fixing component 248 of a flow-induced vibration testing device in one embodiment. The support component 240 of the flow-induced vibration testing device also includes the vibration damping component 246 and the fixing component 248.

[0101] The vibration damping component 246 is V-shaped and installed on the bend section of the non-linear heat transfer tube; a third through hole 401 is opened at both ends of the vibration damping component 246; the number of vibration damping components 246 is at least five sets, and each set of vibration damping components 246 includes at least six layers of vibration damping strips 402. In the bend section of the heat transfer tube, the vibration damping strips 402 are spaced apart from the non-linear heat transfer tube, and the vibration damping strips 402 are used to fix the bend section of the non-linear heat transfer tube.

[0102] The fixing assembly 248 includes at least five pairs of anti-vibration bar rods 403. Each pair of anti-vibration bar rods 403 passes through a third through hole 401 on a set of anti-vibration assemblies 246 and is connected to the outer shell of the test section 160. The two ends of each pair of anti-vibration bar rods 403 are fixed by nuts.

[0103] In this embodiment, the support assembly 240 further includes a vibration damping assembly 246 and a fixing assembly 248. In the bends of the heat transfer tubes, the vibration damping strips 402 in the vibration damping assembly 246 are spaced apart from the non-linear heat transfer tubes, and the vibration damping strips 402 are used to fix the bends of the non-linear heat transfer tubes. The fixing assembly 248 includes at least five pairs of vibration damping strip tie rods 403, which are used to fix the vibration damping assembly 246. The vibration damping assembly 246 and the fixing assembly 248 strengthen the support structure of the bends of multiple non-linear heat transfer tubes, thereby enhancing the stability of the flow-induced vibration test device. This allows the flow-induced vibration test device to accurately simulate the flow-induced vibration behavior of the heat transfer tubes in the tube bundle region of a large natural circulation heat exchanger in actual production, thus enabling more accurate verification of the safety margin of the heat transfer tubes in the large natural circulation heat exchanger when flow-induced vibration occurs. Furthermore, this ensures the safe operation of the large natural circulation heat exchanger in actual production.

[0104] In one embodiment, the support component 240 further includes a collar; the collar is sleeved on the anti-vibration strip rod, and the anti-vibration strips of different layers in each group of anti-vibration components 246 are spaced apart by the collar.

[0105] like Figure 4 As shown, the support assembly 240 of the flow-induced vibration test device also includes a collar 404;

[0106] The collar 404 is fitted onto the anti-vibration strip tie rod 403, and the anti-vibration strips 402 of different layers in each anti-vibration assembly 246 are spaced apart by the collar 404.

[0107] In this embodiment, the support assembly 240 further includes a collar 404, which is used to space the vibration-damping strips 402 of different layers in each set of vibration-damping assemblies 246. The collar 404, in conjunction with the vibration-damping assembly 246 and the fixing assembly 248, strengthens the support structure of multiple non-linear heat transfer tube bends, thereby enhancing the stability of the flow-induced vibration test device. This allows the device to accurately simulate the flow-induced vibration behavior of heat transfer tubes in the tube bundle region of a large natural circulation heat exchanger in actual production, thus accurately verifying the safety margin of the heat transfer tubes in the large natural circulation heat exchanger when flow-induced vibration occurs. Furthermore, this ensures the safe operation of the large natural circulation heat exchanger in actual production.

[0108] In one embodiment, the data acquisition device of the flow-induced vibration testing apparatus includes:

[0109] Accelerometers are installed on the inner walls of multiple non-linear heat transfer tubes, the outer shell of the flow channel, and the test bench; the accelerometers are used to measure the acceleration data of multiple non-linear heat transfer tubes and the test device.

[0110] Pressure sensors are installed on the outer wall of the target heat transfer tube and at pressure measuring points outside the multiple non-linear heat transfer tubes to measure the pressure data of the fluid outside the multiple non-linear heat transfer tubes; the distance between the target heat transfer tube and the support assembly meets the preset distance conditions.

[0111] A temperature sensor is installed on the external outlet pipe connected to the fluid outlet section to measure the temperature data of the entire test loop;

[0112] A flow detection sensor is installed in the fluid inlet section and the fluid mixing section to detect the flow rate of the fluid entering the fluid inlet section and the flow rate of the fluid entering the fluid mixing section.

[0113] The acceleration sensor includes a first acceleration sensor and a second acceleration sensor. The first acceleration sensor is installed on the inner wall of multiple non-linear heat transfer tubes and is used to measure the acceleration data of the multiple non-linear heat transfer tubes. Optionally, the first acceleration sensor can be a triaxial accelerometer, that is, a triaxial accelerometer can be installed at a triaxial acceleration measurement point as the first acceleration sensor, used to measure the acceleration value of the mixed fluid when it undergoes flow-induced vibration under different preset fluid flow parameters. Figure 5 The diagram shown illustrates the installation of a first accelerometer sensor on a heat transfer tube in another embodiment. The accelerometer 501 is mounted inside a non-linear heat transfer tube 504 via screws 502 and a rubber ring 503. Figure 6 As shown, this is a schematic diagram of the wiring of the first accelerometer on the heat transfer tube in another embodiment. After the triaxial accelerometer is successfully installed, the wiring on the triaxial accelerometer is connected out of the test section 160 through the small hole on the base plate 242, and then the wiring is routed along the inner wall of the flow channel of the fluid mixing section 140. The wiring on the triaxial accelerometer is connected out of the flow-induced vibration test device through the opening on the outer shell and connected to the test analysis equipment.

[0114] The second accelerometer is mounted on the outer shell of the flow channel and on the test bench, and is used to measure the acceleration data of the test apparatus. Specifically, such as... Figure 7 The diagram shown illustrates the installation of a second acceleration sensor on the experimental setup in another embodiment. Figure 8 The diagram shows the installation of a second acceleration sensor on a support frame in another embodiment. Optionally, the second acceleration sensor can be an accelerometer. Accelerometers 702 are mounted on the test frame and the test device body. A total of 10 second acceleration sensors are used for measurement. The second acceleration sensors on the test frame and the test device are used to monitor the acceleration of the test frame and the test device itself during vibration.

[0115] The pressure sensor includes a first pressure sensor and a second pressure sensor. The first pressure sensor is disposed on the outer wall of the target heat transfer tube among multiple non-linear heat transfer tubes, and is used to measure the strain data of the multiple non-linear heat transfer tubes; the distance between the target heat transfer tube and the support assembly meets a preset distance condition. Specifically, the first pressure sensor on the heat transfer tube is used to measure the vibration stress when the heat transfer tube undergoes flow-induced vibration under different preset fluid flow parameters. Optionally, the first pressure sensor can be a strain gauge. Figure 9 The diagram shows the installation of the first pressure sensor on the heat transfer tube in another embodiment. The first pressure sensor 902 is attached to the designated heat transfer tube 904 at a distance of 40mm from the anti-vibration strip support position or the support plate 244 position, and is attached to four positions on the designated heat transfer tube, in the direction of the incoming flow and perpendicular to the incoming flow direction. A rubber sleeve 906 is then used to wrap the strain gauge to prevent the fluid from directly scouring the strain gauge and causing damage due to vibration stress. The ends of the rubber sleeve 906 are fixed with metal rings 908. Figure 10 The diagram shown illustrates the wiring of the first pressure sensor on the heat transfer tube in another embodiment. After all the first pressure sensors are successfully installed, following the principle of proximity, the wiring of the first pressure sensors runs along the outer wall of the heat transfer tube and exits from the flange at the first support plate 244. Figure 11The diagram shown illustrates the installation positions of the first acceleration sensor and the first pressure sensor in another embodiment.

[0116] The second pressure sensor is installed at a pressure measuring point outside the multiple non-linear heat transfer tubes to measure the pressure data of the fluid outside the tubes. Specifically, the second pressure sensor on the experimental setup is used to measure the cavitation fraction of the fluid outside the multiple non-linear heat transfer tubes, such as... Figure 12 The diagram shows the installation of a second pressure sensor on a heat transfer tube in another embodiment. Four pressure measuring points P1, P2, P9, and P10 are set in the bend section of the non-linear heat transfer tube; four pressure measuring points P3, P4, P5, and P6 are set in the straight section of the non-linear heat transfer tube between the first and second support plates; and two pressure measuring points P7 and P8 are set in the straight section of the non-linear heat transfer tube between the second support plate and the base plate 242. After obtaining the pressure data of P1, P2, P9, and P10 through the second pressure sensor, the average of the pressure data of P1, P2, P9, and P10 is calculated to obtain the pressure data of the bend section of the non-linear heat transfer tube. Based on the pressure data of the bend section of the non-linear heat transfer tube, the cavitation fraction of the bend sections of multiple non-linear heat transfer tubes is calculated. The pressure loss of the first support plate is obtained by obtaining the pressure data of P1 and P3, or the pressure data of P2 and P4, through the second pressure sensor. The pressure data of P3 and P5, or P4 and P6, are obtained through the second pressure sensor, thereby determining the pressure loss of the straight section of the non-linear heat transfer tube. The pressure data of P5 and P7, or P6 and P8, are obtained through the second pressure sensor, thereby determining the pressure loss of the second support plate.

[0117] A temperature sensor is installed on the external outlet pipe connected to the fluid outlet section 180 to measure the temperature data of the entire test loop. Specifically, the temperature sensor can accurately monitor the fluid temperature and whether the overall temperature of the test apparatus meets the preset threshold.

[0118] Flow detection sensors are installed in the fluid inlet section 120 and the fluid mixing section 140 to detect the flow rate of the fluid entering the fluid inlet section and the flow rate of the fluid entering the fluid mixing section. Specifically, the flow sensors monitor the flow rates of the first fluid and the second fluid, and then, by using the pressure data measured by the second pressure sensor, the flow rate data of the first fluid, and the flow rate data of the second fluid, the cavitation fraction at a specified location of the test apparatus is calculated.

[0119] In this embodiment, accelerometers are installed on the inner walls of multiple non-linear heat transfer tubes, the outer shell of the flow channel, and the test bench. These accelerometers measure the acceleration data of the multiple non-linear heat transfer tubes and the test apparatus. Pressure sensors are installed on the outer walls of the target heat transfer tube and at pressure measurement points outside the multiple non-linear heat transfer tubes to measure the pressure data of the fluid outside the tubes. A temperature sensor is installed on the external outlet pipe connected to the fluid outlet section to measure the temperature data of the entire test loop. Flow detection sensors are installed at the fluid inlet section and the fluid mixing section to detect the flow rate of the fluid entering the inlet section and the flow rate of the fluid entering the mixing section. This provides the test data required by the acquisition equipment when multiple non-linear heat transfer tubes experience flow-induced vibration, thereby verifying the flow-induced vibration behavior under high flow rate conditions and accurately verifying the safety margin of heat transfer tubes in large natural circulation heat exchangers when flow-induced vibration occurs. This ensures that large-scale natural circulation heat exchangers can operate safely in actual production.

[0120] In one embodiment, such as Figure 13 The diagram shows a schematic of the structure of the fluid mixing section 140 of a flow-induced vibration test apparatus in one embodiment. The fluid mixing section 140 of the flow-induced vibration test apparatus includes a first mixing section 142 and a second mixing section 144 connected in sequence. The first fluid flows into the first mixing section 142 through the fluid inlet section 120. The first mixing section 142 includes a second fluid inlet pipe 1422. The second fluid flows into the first mixing section 142 through the second fluid inlet pipe and mixes with the first fluid in the first mixing section 142 to generate an intermediate mixed fluid.

[0121] The second mixing section includes a packing layer 1442. The intermediate mixing fluid flows from the first mixing section 142 into the second mixing section 144 and is mixed through the packing layer 1442 to generate a mixed fluid.

[0122] Specifically, the fluid inlet section 120 has two rows of inlets at the top of its inlet pipe, through which the first fluid flows into the first mixing section 142. The first mixing section 142 includes a second fluid inlet pipe, which includes a main pipe 1422a, a branch pipe 1422b, and a nozzle 1422c. The second fluid flows into the first mixing section 142 through the second fluid inlet pipe 1422 and mixes with the first fluid in the first mixing section 142 to generate an intermediate mixed fluid. The second mixing section 144 is provided with a packing layer 1442, which can fully cut the first and second fluids to achieve uniform mixing and realize a bubble flow pattern. The intermediate mixed fluid flows from the first mixing section 142 into the second mixing section 144 and is mixed through the packing layer 1442 to generate a mixed fluid.

[0123] In this embodiment, the fluid mixing section 140 includes a first mixing section 142 and a second mixing section 144 connected in sequence. A first fluid flows into the first mixing section 142 through a fluid inlet section 120. The first mixing section 142 includes a second fluid inlet pipe 1422, through which the second fluid flows into the first mixing section 142 and mixes with the first fluid to generate an intermediate mixed fluid. A packing layer 1442 is provided within the second mixing section, through which the intermediate mixed fluid flows from the first mixing section 142 into the second mixing section 144 and mixes with the packing layer 1442 to generate a mixed fluid. The fluid mixing section 140 enables uniform mixing of the fluid in the test section 160, thereby verifying the flow-induced vibration behavior under high flow rate conditions. This allows for more accurate verification of the safety margin of the heat transfer tubes in a large natural circulation heat exchanger when flow-induced vibration occurs. Furthermore, it ensures the safe operation of the large natural circulation heat exchanger in actual production.

[0124] In one embodiment, the fluid inlet section 120 includes a first fluid inlet pipe, a fourth through hole, and a baffle plate;

[0125] The first fluid flows into the test device through the first fluid inlet pipe; the fourth through hole is opened at one end of the first fluid inlet pipe, and the first fluid flows into the first mixing section through the fourth through hole; the baffle plate is set on one side of the fourth through hole to make the flow rate of the first fluid evenly distributed.

[0126] Combination Figure 1 As shown, the fluid inlet section 120 includes a first fluid inlet pipe, a fourth through hole, and a baffle plate. The first fluid flows into the fluid inlet section 120 through the first fluid inlet pipe. Figure 14 The diagram shows a schematic of the fourth through-hole 1402 in the fluid inlet section of one embodiment. Two rows of fourth through-holes 1402 are provided at the top of the first fluid inlet pipe, through which the first fluid flows into the fluid mixing section 140. A baffle plate is disposed on the side of the first fluid inlet pipe where the fourth through-holes are located. The baffle plate includes multiple baffles that divide the first fluid into multiple first fluid channels. The first fluid can pass through the first fluid channels between each baffle, resulting in a uniform flow rate. The uniformly distributed first fluid then flows into the fluid mixing section 140 through the first fluid channels.

[0127] In this embodiment, the fluid inlet section 120 includes a first fluid inlet pipe, a fourth through hole, and a baffle plate. The first fluid flows into the test device through the first fluid inlet pipe. The fourth through hole is located at one end of the first fluid inlet pipe, through which the first fluid flows into the first mixing section. The baffle plate is disposed on one side of the fourth through hole to ensure a uniform flow rate of the first fluid. The arrangement of the first fluid inlet pipe, the fourth through hole, and the baffle plate in the fluid inlet section 120 enables a uniform distribution of the first fluid, preparing for thorough mixing of the first and second fluids. This allows for more accurate verification of flow-induced vibration behavior under high flow rate conditions, and thus more accurately verifies the safety margin of the heat transfer tubes in a large natural circulation heat exchanger when flow-induced vibration occurs. Furthermore, it ensures the safe operation of the large natural circulation heat exchanger in actual production.

[0128] In one embodiment, the test simulator also includes an observation window;

[0129] The observation window is set on the outer shell of the test device in the fluid mixing section and the test section, and is used to observe the mixing of the first fluid and the second fluid.

[0130] Combination Figure 1 As shown, observation windows are installed on the outer shell of the test device in the fluid mixing section and the test section, specifically divided into a first observation window, a second observation window, and a third observation window. There are three first observation windows, evenly distributed on the outer shell of the fluid mixing section below the base plate. These first observation windows allow observation of the mixing effect of the fluid, serving as a benchmark for observing the mixing effect in the test section. There are five second observation windows, evenly distributed on the outer shell of the test section below the second support plate. These second observation windows allow for a more comprehensive observation of the mixing effect of the fluid outside the straight sections of the multiple non-linear heat transfer tubes, reducing blind spots compared to the first observation windows. There are five third observation windows, evenly distributed in an arc shape on the outer shell of the curved sections of the multiple non-linear heat transfer tubes. These third observation windows allow observation of the mixing effect of the fluid outside the curved sections of the multiple non-linear heat transfer tubes.

[0131] In this embodiment, an observation window is installed on the outer shell of the test device in the fluid mixing section and the test section to observe the mixing of the first fluid and the second fluid. By providing the observation window, a high-speed camera outside the flow-induced vibration test device can observe the mixing effect of the mixed fluid and the vibration of multiple non-linear heat transfer tubes. This allows for more accurate verification of the flow-induced vibration behavior under high flow rate conditions, and thus more accurately verifies the safety margin of the heat transfer tubes in a large natural circulation heat exchanger when flow-induced vibration occurs. Furthermore, this ensures the safe operation of the large natural circulation heat exchanger in actual production.

[0132] In one embodiment, the support plate 244 of the flow-induced vibration testing device includes a first support plate and a second support plate;

[0133] The first support plate and the second support plate are arranged sequentially within the test section 160, and both the first support plate and the second support plate are set in the straight pipe section of multiple non-linear heat transfer pipes.

[0134] Combination Figure 1 As shown, the first support plate and the second support plate are arranged sequentially within the test section 160, and both the first support plate and the second support plate are installed on the straight sections of multiple non-linear heat transfer tubes. The second support plate is positioned between the first support plate and the base plate 242.

[0135] In this embodiment, the support plate 244 includes a first support plate and a second support plate, both of which are disposed on the straight sections of multiple non-linear heat transfer tubes. The placement of the first and second support plates strengthens the support structure of the straight sections of the multiple non-linear heat transfer tubes, enabling the flow-induced vibration testing device to accurately simulate the flow-induced vibration behavior of the heat transfer tubes in the tube bundle region of a large-scale natural circulation heat exchanger in actual production. This allows for accurate verification of the safety margin of the heat transfer tubes in the large-scale natural circulation heat exchanger when flow-induced vibration occurs. Furthermore, it ensures the safe operation of the large-scale natural circulation heat exchanger in actual production.

[0136] In one embodiment, the non-linear heat transfer tube of the flow-induced vibration test apparatus includes either a U-shaped heat transfer tube or a spiral heat transfer tube. The non-linear heat transfer tube comprises straight sections and bent sections.

[0137] In this embodiment, the non-linear heat transfer tube includes any one of U-shaped or spiral heat transfer tubes. The flow-induced vibration test device in this application uses multiple non-linear heat transfer tubes with similar complexity to those in actual production. These multiple non-linear heat transfer tubes can accurately simulate the non-linear heat transfer tube structure in the tube bundle region of a large natural circulation heat exchanger in actual production, thereby accurately simulating the flow-induced vibration of fluids in actual production. This allows for accurate verification of the safety margin of the heat transfer tubes in a large natural circulation heat exchanger when flow-induced vibration occurs. Consequently, it ensures the safe operation of the large natural circulation heat exchanger in actual production.

[0138] The flow-induced vibration test simulation method provided in this application embodiment can be applied to, for example... Figure 15In the application environment shown, computer device 1502 communicates with data acquisition device 1504 via a network. Computer device 1502 can store data that data acquisition device 1504 needs to process. The mixed fluid is controlled to flow into test section 160 according to preset fluid flow parameters; the preset fluid flow parameters include fluid velocity parameters and fluid cavitation fraction parameters; when the mixed fluid flows into test section 160, test data of the flow-induced vibration test device is collected by the data acquisition device; the test data includes at least one of acceleration data, strain data, pressure data, temperature data, and flow rate data; the preset fluid flow parameters and the corresponding test data are analyzed to determine the vibration characteristics of multiple non-linear heat transfer tubes during flow-induced vibration. Computer device 1502 can be, but is not limited to, various personal computers, laptops, smartphones, tablets, IoT devices, and portable wearable devices. IoT devices can be smart speakers, smart TVs, smart air conditioners, smart vehicle devices, etc. Portable wearable devices can be smartwatches, smart bracelets, head-mounted devices, etc. The data acquisition device 1504 can be implemented using a standalone server or a server cluster consisting of multiple servers.

[0139] In one embodiment, such as Figure 16 As shown, a method for simulating flow-induced vibration testing is provided and applied to the aforementioned flow-induced vibration testing apparatus. This method is then applied to… Figure 15 Taking computer device 1502 as an example, the explanation includes the following steps:

[0140] Step 1602: Control the mixed fluid to flow into the test section 160 according to the preset fluid flow parameters; the preset fluid flow parameters include fluid velocity parameters and fluid cavitation fraction parameters.

[0141] Among them, the fluid velocity parameter is the fluid velocity; the fluid cavitation fraction parameter is the cavitation fraction, also known as the cross-sectional gas content, which characterizes the percentage of gas in a gas-liquid two-phase mixture. This parameter directly affects the heat and mass transfer characteristics of two-phase flow and is an important parameter affecting the operation and performance of two-phase flow systems. Real-time measurement of this parameter is of great significance.

[0142] Specifically, computer equipment 1502 controls the mixed fluid to flow into test section 160 according to preset fluid flow parameters. In the flow-induced vibration test simulation method of this application, the preset fluid flow parameters include fluid velocity parameters and fluid cavitation fraction parameters, mainly divided into two test conditions: the first is to keep the fluid velocity parameters constant while changing the fluid cavitation fraction parameters, and the second is to keep the fluid cavitation fraction parameters constant while changing the fluid velocity parameters.

[0143] Step 1604: When the mixed fluid flows into the test section 160, the test data of the flow-induced vibration test device when the flow-induced vibration occurs is collected by the acquisition device; the test data includes at least one of acceleration data, strain data, pressure data, temperature data and flow rate data.

[0144] Specifically, when the mixed fluid flows into the test section 160, i.e., when multiple non-linear heat transfer tubes experience flow-induced vibration, the test data of the multiple non-linear heat transfer tubes undergoing flow-induced vibration is collected by the acquisition device 1504. The acquisition device 1504 includes an acceleration sensor, a pressure sensor, a temperature sensor, and a flow detection sensor, specifically collecting the vibration characteristics, damping ratio, and added mass coefficient of the multiple non-linear heat transfer tubes; the vibration acceleration and displacement response values ​​of the straight and curved sections of the multiple non-linear heat transfer tubes under different flow velocities and under different flow velocities; and the vibration strain values ​​of the curved sections of the multiple non-linear heat transfer tubes under different flow velocities and under different flow velocities.

[0145] Step 1606: Analyze the preset fluid flow parameters and the test data corresponding to the preset fluid flow parameters to determine the vibration characteristics of multiple non-linear heat transfer tubes when flow-induced vibration occurs.

[0146] Specifically, computer device 1502 analyzes the preset fluid flow parameters and the corresponding test data. If no vortex shedding resonance or hydrodynamic instability is found within the test flow velocity range, and no abnormal vibration is detected; and the test data collected by acquisition device 1504 when the flow-induced vibration test device experiences flow-induced vibration, including the vibration characteristics of multiple non-linear heat transfer tubes and the vibration acceleration, strain, and displacement values ​​under different operating conditions, all meet the requirements of the flow-induced vibration safety margin of the flow-induced vibration test device for test data, thereby accurately verifying the safety margin of the heat transfer tubes in the large natural circulation heat exchanger when flow-induced vibration occurs.

[0147] In the aforementioned flow-induced vibration test simulation method, the mixed fluid is controlled to flow into the test section 160 according to preset fluid flow parameters. These preset fluid flow parameters include fluid velocity parameters and fluid cavitation fraction parameters. When the mixed fluid flows into the test section 160, test data is collected from the flow-induced vibration test device using a data acquisition device. The test data includes at least one of acceleration data, strain data, pressure data, temperature data, and flow rate data. The preset fluid flow parameters and the corresponding test data are analyzed to determine the vibration characteristics of multiple non-linear heat transfer tubes during flow-induced vibration. The flow-induced vibration test simulation method in this application collects test data from the flow-induced vibration test device when multiple non-linear heat transfer tubes experience flow-induced vibration, and analyzes the obtained test data. This process can accurately simulate the flow-induced vibration behavior of heat transfer tubes in the tube bundle area of ​​a large natural circulation heat exchanger in actual production, thereby accurately verifying the safety margin of heat transfer tubes in a large natural circulation heat exchanger during flow-induced vibration. This ensures that large-scale natural circulation heat exchangers can operate safely in actual production.

[0148] In one embodiment, such as Figure 17 As shown, a design method for a flow-induced vibration testing device is provided, which is applied to the above-mentioned flow-induced vibration testing device, and includes the following steps:

[0149] Step 1702: Obtain the initial model of the flow-induced vibration test device; the initial model includes the initial flow channel and the initial test simulation body, which includes multiple non-linear heat transfer pipes and support components.

[0150] Specifically, modal analysis was conducted on the heat transfer tubes in the flow-induced vibration test apparatus to ensure that the vibration characteristics of the bends in the heat transfer tubes of the test apparatus were similar to those of the bends in the actual product. Specifically, the vibration frequencies and mode shapes of the bends in the test apparatus and the product were kept similar. This led to the determination of the decoupling criterion between the bends and straight sections of the heat transfer tubes: taking two spans of straight tubes eliminates the influence of the straight section as a whole on the dynamic characteristics of the bends. Consequently, the scale of the heat transfer tubes in the test apparatus was determined to be two spans of straight tubes and all bends, thus determining the dimensions of the heat transfer tubes in the flow-induced vibration test apparatus and obtaining the initial model of the flow-induced vibration test apparatus.

[0151] Step 1704: Perform flow-induced vibration analysis and flow field analysis on the initial model to determine the first initial parameters of the initial flow channel and multiple non-linear heat transfer tubes. The first initial parameters are the parameters of the initial flow channel and multiple non-linear heat transfer tubes when the initial model meets the preset envelope requirements during flow-induced vibration and when the flow field of the initial model meets the preset flow field requirements.

[0152] Specifically, firstly, a pre-analysis of flow-induced vibration is performed on the initial model. Firstly, based on preset requirements, the mass flow rate, cavitation fraction range, and dimensions of the heat transfer tubes in the tube bundle bend region under the steady-state operating conditions of the actual product are verified, and the envelope performance of the flow-induced vibration test device is calculated.

[0153] Secondly, based on the calculated operating conditions, a flexural instability analysis was conducted on the heat transfer tubes in the pre-designed flow-induced vibration test device to obtain the flexural instability rate of the heat transfer tube with the largest bend radius in the pre-designed flow-induced vibration test device. Based on the principle of determining the maximum flexural instability rate of the heat transfer tube with the largest bend radius in the envelope product, the requirements for the test operating conditions were determined.

[0154] Next, turbulent buffeting analysis was conducted on the heat transfer tubes in the pre-designed flow-induced vibration test apparatus to obtain the root mean square effective value of the turbulent buffeting response of the heat transfer tubes, and compared with the turbulent buffeting response in the actual product. Based on the requirement that the vibration response of the pre-designed flow-induced vibration test apparatus envelops the product's vibration response, the principle for meeting the requirements of the turbulent buffeting experiment for the flow-induced vibration test conditions was obtained.

[0155] Second, a pre-analysis of the flow field is performed on the initial model to determine the tube array size, the flow channel dimensions of the test section, and the pressure loss of the test device. Firstly, the pre-analysis of the flow field determines the tube array size and the flow channel thickness selected in the design of the pre-designed flow-induced vibration test device. For example... Figure 18 The diagram shows the tube array size in the pre-analysis of the flow field. The pre-analysis determined that the tube array size to eliminate the influence of boundary conditions is five rows of heat transfer tubes, and the thickness of the test section of the flow-induced vibration test device was determined to be 112 mm. Next, based on the channel dimensions and the results of the pre-analysis of the flow-induced vibration, combined with the flow control capability of the test bench and the performance parameter requirements of the test device, the operating conditions for the flow-induced vibration test were obtained. Then, pressure loss calculations were performed on the pre-designed flow-induced vibration test device to obtain its working pressure. Based on the working pressure and the test loop, a matching design was carried out, and the segmental pressure drop of each section of the test device was determined.

[0156] Third, perform flow field analysis on the initial model. Firstly, as... Figure 19 The diagram shows the inter-tube velocity distribution of the heat transfer tubes in the test section. Through flow field analysis, the inter-tube velocity distribution of the heat transfer tubes in the test section is obtained. Based on flow conservation, the inter-tube velocity of the target heat transfer tube is calculated, providing input for subsequent flow-induced vibration analysis of the heat transfer tubes. Secondly, as... Figure 20 The diagram shows the locations of the heat transfer tubes to be measured in the high-velocity region. The velocity distribution is used to initially determine the locations of the heat transfer tubes to be measured in the high-velocity region. Next, the inter-tube velocity distribution of heat transfer tubes at key locations selected from the pre-set flow-induced vibration test apparatus is compared with that of heat transfer tubes at the same locations in the actual product. Figure 21The image shows a comparison of the inter-tube flow velocity under certain test conditions and the actual steady-state operation of a heat transfer tube; for example... Figure 22 The image shows a comparison of the fluid dynamic pressure under certain test conditions and the steady-state operation of the actual product on a heat transfer tube. Figure 21 , Figure 22 As can be seen from the data, the fluid velocity and dynamic pressure experienced by the heat transfer tube in the pre-set flow-induced vibration test device can effectively envelop the heat transfer tube at the same position on the product. The fluid excitation of the heat transfer tube is positively correlated with the flow velocity and dynamic pressure between the tubes, and the response of the flow-induced vibration is also positively correlated with the fluid excitation. This verifies that the flow field of the pre-set flow-induced vibration test device has the ability to envelop the actual product in terms of flow-induced vibration.

[0157] Fourth, flow-induced vibration analysis was performed on the initial model. First, based on the flow velocity between the heat transfer tubes in the test device obtained from the flow field analysis, the envelope of the heat transfer tubes' flow-induced vibration response to the actual product was verified. By comparing the vibration response of the heat transfer tubes in the pre-designed flow-induced vibration test device with that of the actual product's heat transfer tubes, it can be seen that the flow-induced vibration response of the pre-designed flow-induced vibration test device under typical operating conditions can well encapsulate the vibration response of the heat transfer tubes at the same location in the actual product. Second, based on the results of the flow field analysis and flow-induced vibration analysis of the pre-designed flow-induced vibration test device, and considering the structural characteristics of the heat transfer tubes in the pre-designed flow-induced vibration test device, the measurement point locations were selected. The measurement point locations should adhere to the following principles: 1) located in the high transverse inter-tube flow velocity region and the high fluid dynamic pressure region; 2) located at locations with large effective values ​​of turbulent excitation vibration response; 3) located at locations with large vibration stress; 4) located at the critical position of the vibration damping strip support: the location of the maximum unsupported span; 5) symmetry was considered; 6) a certain degree of redundancy was considered; 7) the installability of strain gauges and accelerometers was considered. Based on the above principles, the locations of acceleration and strain measurement points are determined when conducting flow-induced vibration tests. This allows us to determine the initial parameters of the initial flow channel and multiple non-linear heat transfer tubes when the initial model meets the preset envelope requirements during flow-induced vibration and when the flow field of the initial model meets the preset flow field requirements.

[0158] Step 1706: Assign first initial parameters to the initial flow channel and multiple non-linear heat transfer tubes in the initial model to generate a first intermediate model. Perform stress analysis on the first intermediate model to determine the second initial parameters of the support components in the first intermediate model that meet the preset stress conditions.

[0159] Specifically, a first intermediate model is generated by assigning first initial parameters to the initial flow channel and multiple non-linear heat transfer tubes in the initial model. Based on the segmented pressure drop and considering a safety factor of 1.5, the first intermediate model is divided into three parts for stress analysis. The first part is the fluid inlet section and fluid mixing section; the second part is the straight pipe test section; and the third part is the bend pipe test section and fluid outlet section. Based on the stress analysis, second initial parameters for the support components in the first intermediate model are determined to meet the preset stress conditions, ensuring that the maximum and deformation of the preset flow-induced vibration test device meet the preset requirements.

[0160] Step 1708: Assign second initial parameters to the support components in the first intermediate model to obtain the second intermediate model. Conduct a fluid mixing experiment on the second intermediate model to determine the third initial parameters of the initial flow channel in the second intermediate model that meet the preset fluid mixing experiment conditions.

[0161] Specifically, the supporting components in the first intermediate model are assigned second initial parameters to obtain the second intermediate model. To ensure that the first and second fluids are fully mixed before the test section and that the morphology of the mixed fluid is approximately bubbly during the test, a fluid mixing device that meets the preset requirements and whose structural interface is compatible with the preset flow-induced vibration test device body needs to be developed. Fluid mixing experiments are then conducted on the second intermediate model. First, based on the operating flow rate of the test section of the test device and the structural dimensions of the inlet position of the fluid mixing section, the flow rate at the inlet of the fluid mixing section is calculated to ensure that the fluid mixing module meets the performance requirements for fluid mixing within the inlet flow rate range of the fluid mixing section. Then, considering the test bench capacity, the overall pressure loss of the fluid mixing module is calculated, including the nozzle pressure loss, the spray head pressure loss, and the pressure loss of the packing layer in the mixing section. By calculating and optimizing the mixer pressure loss and iterating several times, the structure of the fluid mixing module that meets the pressure loss requirements of the test bench is determined.

[0162] Secondly, the determined fluid mixing module structure is combined with Figure 13 As shown. The second fluid inlet pipe 1422 includes a main pipe 1422a, a branch pipe 1422b, and a nozzle 1422c. The end interface of the branch pipe can be connected to the nozzle to achieve preliminary air-water mixing under low cavitation conditions, and the end of the branch pipe can also be connected to a spray head to achieve preliminary air-water mixing under high cavitation conditions. Specifically, under low cavitation conditions, the first fluid inlet is connected to the water circuit of the test circuit, and the second fluid inlet is connected to the air circuit; under high cavitation conditions, the first fluid inlet is connected to the air circuit, and the second fluid inlet is connected to the water circuit. The second mixing section is connected to the first mixing section through a flange, and a corrugated plate packing layer is provided inside the second mixing section to achieve thorough mixing of the fluids.

[0163] Furthermore, due to the complexity of two-phase flow, it is difficult to establish or select a suitable mathematical and physical model for two-phase mixing using theoretical methods such as computational fluid dynamics. Therefore, after completing the design of the fluid mixing module structure, it is necessary to conduct experiments on the fluid mixing module to observe the fluid mixing effect under different operating conditions, and to provide a reference for subsequent experiments on the entire flow-induced vibration test device. The design principles of the fluid mixing module performance test device are as follows: 1) The flow velocity through the performance test simulation body of the mixing device is consistent with that of the flow-induced vibration test device; 2) The perforation velocity of the nozzle is consistent with that of the flow-induced vibration test device; 3) The maximum and minimum values ​​of the cavitation fraction cover the operating parameter range of the flow-induced vibration test device; 4) The layout is consistent with the test device. Figure 23 The diagram shown is a structural schematic of the fluid mixing module performance test simulator designed according to the above design principles. Figure 24 The diagram shown is a schematic of the installation of the fluid mixing module performance test simulator in the test loop.

[0164] Subsequently, based on the test conditions required by the flow-induced vibration test apparatus and adhering to the principle that the apparent velocities of air and water are consistent, a fluid mixing experiment was conducted based on the structural characteristics of the fluid mixing module performance test simulator to determine the test conditions for the performance test. During the fluid mixing experiment, a high-speed camera was used to capture the mixing effect in the transparent section downstream of the mixing unit. Electromagnetic flow meters and air flow meters were used to measure the water flow rate and air flow rate, respectively. The pressure and pressure difference of the test simulator and the test circuit were also measured.

[0165] Finally, the obtained experimental results mainly consisted of video data of air-water mixing captured by a high-speed camera and the pressure difference of the simulated body measured by the pressure difference measuring point. Through video comparison and pressure difference analysis, the following conclusions were drawn: 1) Under low flow rate and low cavitation rate conditions, bubbles easily aggregate into large bubbles, but at the end of the transparent section, they basically break down into smaller bubbles again; 2) Under high flow rate conditions, there was no significant difference in the mixing effect produced by air pipes with different openings; 3) Under low flow rate conditions, the mixing effect of the 80-hole air pipe was slightly better than that of the 400-hole air pipe; 4) Under low air flow rate conditions, not all openings of the 400-hole air pipe had airflow; only the top two rows of openings had airflow; 5) At high air flow rates, the air resistance of the 80-hole air pipe was greater than that of the 400-hole air pipe. Based on the analysis of these conclusions, it was concluded that the designed fluid mixing module has the characteristics of good mixing effect and low resistance, which can meet the experimental requirements. Furthermore, the number of openings in the nozzle on the flow-induced vibration test device was determined, thereby determining the third initial parameter of the initial flow channel in the second intermediate model that meets the preset fluid mixing experimental conditions.

[0166] Step 1710: Based on the first initial parameters of the initial flow channel and multiple non-linear heat transfer tubes, the second initial parameters of the support assembly, and the third initial parameters of the initial flow channel, a flow-induced vibration test device is generated.

[0167] Specifically, through the above-mentioned flow-induced vibration analysis, flow field analysis, stress analysis, and fluid mixing experiment, the first initial parameters of the initial flow channel and multiple non-linear heat transfer tubes, the second initial parameters of the support components, and the third initial parameters of the initial flow channel are obtained, and the flow-induced vibration test device is generated, thereby completing the design of the flow-induced vibration test device.

[0168] In the aforementioned design method for flow-induced vibration, an initial model of the flow-induced vibration test device is obtained. The initial model includes an initial flow channel and an initial test simulation body, which includes multiple non-linear heat transfer tubes and supporting components. Flow-induced vibration analysis and flow field analysis are performed on the initial model to determine the first initial parameters of the initial flow channel and the multiple non-linear heat transfer tubes. These first initial parameters are the parameters of the initial flow channel and the multiple non-linear heat transfer tubes when the initial model meets preset envelope requirements during flow-induced vibration and when the flow field of the initial model meets preset flow field requirements. The initial flow channel and the multiple non-linear heat transfer tubes in the initial model are then analyzed. A first intermediate model is generated by assigning first initial parameters to the tubes. Stress analysis is performed on the first intermediate model to determine the second initial parameters of the support components that meet preset stress conditions. The second initial parameters are then assigned to the support components in the first intermediate model to obtain a second intermediate model. A fluid mixing experiment is conducted on the second intermediate model to determine the third initial parameters of the initial flow channel groove that meet preset fluid mixing experimental conditions. Based on the first initial parameters of the initial flow channel groove and multiple non-linear heat transfer tubes, the second initial parameters of the support components, and the third initial parameters of the initial flow channel groove, a flow-induced vibration test device is generated. Through flow-induced vibration analysis, flow field analysis, stress analysis, and fluid mixing experiments, the flow-induced vibration test device of this application is obtained. Using this designed flow-induced vibration test device, the flow-induced vibration behavior of the heat transfer tubes in the tube bundle region of a large natural circulation heat exchanger in actual production can be simulated relatively accurately. This allows for accurate verification of the safety margin of the heat transfer tubes in a large natural circulation heat exchanger when flow-induced vibration occurs. Therefore, it can be ensured that the large natural circulation heat exchanger can operate safely in actual production.

[0169] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0170] Based on the same inventive concept, this application also provides a flow-induced vibration test simulation device for implementing the flow-induced vibration test simulation method described above. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more flow-induced vibration test simulation device embodiments provided below can be found in the limitations of the flow-induced vibration test simulation method above, and will not be repeated here.

[0171] In one embodiment, such as Figure 25 As shown, a flow-induced vibration test simulation device 2500 is provided, including: a mixed fluid inflow module 2502, a test data acquisition module 2504, and a test data analysis module 2506, wherein:

[0172] The mixed fluid inflow module 2502 is used to control the mixed fluid to flow into the test section 160 according to preset fluid flow parameters; the preset fluid flow parameters include fluid velocity parameters and fluid cavitation fraction parameters.

[0173] The test data acquisition module 2504 is used to acquire test data of the flow-induced vibration test device when the mixed fluid flows into the test section 160; the test data includes at least one of acceleration data, strain data, pressure data, temperature data and flow rate data;

[0174] The test data analysis module 2506 is used to analyze the preset fluid flow parameters and the test data corresponding to the preset fluid flow parameters to determine the vibration characteristics of multiple non-linear heat transfer tubes when flow-induced vibration occurs.

[0175] Each module in the aforementioned flow-induced vibration testing device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the computer device's memory as software, so that the processor can call and execute the corresponding operations of each module.

[0176] In one embodiment, a computer device is provided, which may be a server or a terminal, and its internal structure diagram may be as follows: Figure 26As shown, the computer device includes a processor, memory, and a network interface connected via a system bus. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database stores flow-induced vibration test data. The network interface communicates with external terminals via a network connection. When the computer program is executed by the processor, it implements a flow-induced vibration test simulation method.

[0177] Those skilled in the art will understand that Figure 26 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0178] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0179] The mixed fluid is controlled to flow into the test section 160 according to preset fluid flow parameters; the preset fluid flow parameters include fluid velocity parameters and fluid cavitation fraction parameters.

[0180] When the mixed fluid flows into the test section 160, test data of the flow-induced vibration test device is collected by the acquisition device when the flow-induced vibration occurs; the test data includes at least one of acceleration data, strain data, pressure data, temperature data and flow rate data;

[0181] By analyzing the preset fluid flow parameters and the corresponding test data, the vibration characteristics of multiple non-linear heat transfer tubes when flow-induced vibration occurs are determined.

[0182] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0183] The mixed fluid is controlled to flow into the test section 160 according to preset fluid flow parameters; the preset fluid flow parameters include fluid velocity parameters and fluid cavitation fraction parameters.

[0184] When the mixed fluid flows into the test section 160, test data of the flow-induced vibration test device is collected by the acquisition device when the flow-induced vibration occurs; the test data includes at least one of acceleration data, strain data, pressure data, temperature data and flow rate data;

[0185] By analyzing the preset fluid flow parameters and the corresponding test data, the vibration characteristics of multiple non-linear heat transfer tubes when flow-induced vibration occurs are determined.

[0186] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0187] The mixed fluid is controlled to flow into the test section 160 according to preset fluid flow parameters; the preset fluid flow parameters include fluid velocity parameters and fluid cavitation fraction parameters.

[0188] When the mixed fluid flows into the test section 160, test data of the flow-induced vibration test device is collected by the acquisition device when the flow-induced vibration occurs; the test data includes at least one of acceleration data, strain data, pressure data, temperature data and flow rate data;

[0189] By analyzing the preset fluid flow parameters and the corresponding test data, the vibration characteristics of multiple non-linear heat transfer tubes when flow-induced vibration occurs are determined.

[0190] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0191] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0192] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0193] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A flow-induced vibration testing device, characterized in that, The device includes: a flow channel, a test simulation body, and data acquisition equipment; The flow channel includes a fluid inlet section, a fluid mixing section, a test section, and a fluid outlet section connected in sequence. The fluid mixing section includes a first mixing section and a second mixing section connected in sequence. A first fluid flows into the first mixing section through the fluid inlet section. The first mixing section includes a second fluid inlet pipe, through which the second fluid flows into the first mixing section and mixes with the first fluid to generate an intermediate mixed fluid. The second mixing section is provided with a packing layer, through which the intermediate mixed fluid flows from the first mixing section into the second mixing section and mixes with the packing layer to generate the mixed fluid. The mixed fluid flows through the test section and exits from the fluid outlet section. The test simulation body includes multiple non-linear heat transfer tubes and a support assembly. The support assembly includes a vibration damping component, a fixing component, and a collar. The vibration damping component is V-shaped and installed on the bend of the non-linear heat transfer tube. The non-linear heat transfer tube includes either a U-shaped heat transfer tube or a spiral heat transfer tube. A third through hole is provided at each end of the vibration damping component. There are at least five sets of vibration damping components, and each set includes at least six layers of vibration damping strips. The fixing component includes at least five pairs of vibration damping strip rods. Each pair of vibration damping strip rods passes through the third through hole on a set of vibration damping components and connects to the outer shell of the test section. The collar is fitted onto the vibration damping strip rods, and the vibration damping strips in different layers of each set of vibration damping components are spaced using the collar. The support assembly is used to fix the multiple non-linear heat transfer tubes in the test section. The data acquisition device is installed on the multiple non-linear heat transfer tubes and is used to collect test data when the multiple non-linear heat transfer tubes undergo flow-induced vibration as the mixed fluid flows into the test section.

2. The apparatus according to claim 1, characterized in that, The support assembly includes a base plate; The base plate is connected to the outer shell of the test section; a first through hole is opened on the base plate, and a heat transfer tube fixing assembly is provided on the base plate; the mixed fluid flows from the fluid mixing section into the test section through the first through hole; the two ends of the multiple non-linear heat transfer tubes are connected to the base plate through the heat transfer tube fixing assembly.

3. The apparatus according to claim 2, characterized in that, The support assembly also includes a support plate; The support plate is connected to the outer shell of the test section, and the support plate is located between the bottom plate and the fluid outlet section. The support plate is disposed on the straight section of the non-linear heat transfer tube. A second through hole is opened on the support plate, through which the mixed fluid flows into the fluid outlet section, and the multiple non-linear heat transfer tubes pass through the second through hole and are clearance-fitted with the second through hole on the support plate.

4. The apparatus according to claim 3, characterized in that, The support plate includes a first support plate and a second support plate; The first support plate and the second support plate are arranged sequentially in the test section, and both the first support plate and the second support plate are arranged in the straight pipe section of the multiple non-linear heat transfer pipes.

5. The apparatus according to claim 1, characterized in that, The data acquisition device includes: An acceleration sensor is installed on the inner wall of the multiple non-linear heat transfer tubes, on the outer shell of the flow channel, and on the test bench; the acceleration sensor is used to measure the acceleration data of the multiple non-linear heat transfer tubes and the test device. A pressure sensor is installed on the outer wall of the target heat transfer tube and at a pressure measuring point outside the multiple non-linear heat transfer tubes to measure the pressure data of the multiple non-linear heat transfer tubes and the fluid outside the multiple non-linear heat transfer tubes; the distance between the target heat transfer tube and the support assembly meets a preset distance condition. A temperature sensor is installed on the external outlet pipe connected to the fluid outlet section to measure the temperature data of the entire test circuit. A flow detection sensor is installed in the fluid inlet section and the fluid mixing section to detect the flow rate of the fluid entering the fluid inlet section and the flow rate of the fluid entering the fluid mixing section.

6. The apparatus according to claim 1, characterized in that, The fluid inlet section includes a first fluid inlet pipe, a fourth through hole, and a baffle plate; The first fluid flows into the test device through the first fluid inlet pipe; the fourth through hole is opened at one end of the first fluid inlet pipe, and the first fluid flows into the first mixing section through the fourth through hole; the baffle plate is disposed on one side of the fourth through hole to make the flow rate of the first fluid evenly distributed.

7. The apparatus according to claim 1, characterized in that, The experimental simulator also includes an observation window; The observation window is located on the outer shell of the test device in the fluid mixing section and the test section, and is used to observe the mixing of the first fluid and the second fluid.

8. A method for simulating flow-induced vibration, characterized in that, Applied to the flow-induced vibration testing apparatus as described in any one of claims 1-7, the method comprises: The mixed fluid is controlled to flow into the test section according to preset fluid flow parameters; the preset fluid flow parameters include fluid velocity parameters and fluid cavitation fraction parameters. When the mixed fluid flows into the test section, test data of the flow-induced vibration test device is collected by the acquisition device when the flow-induced vibration occurs; the test data includes at least one of acceleration data, strain data, pressure data, temperature data and flow rate data; The preset fluid flow parameters and the corresponding test data are analyzed to determine the vibration characteristics of multiple non-linear heat transfer tubes when flow-induced vibration occurs.

9. A flow-induced vibration simulation test device, characterized in that, Applied to the flow-induced vibration testing apparatus as described in any one of claims 1-7, the apparatus further includes: A mixed fluid inflow module is used to control the mixed fluid to flow into the test section according to preset fluid flow parameters; the preset fluid flow parameters include fluid velocity parameters and fluid cavitation fraction parameters. The test data acquisition module is used to acquire test data of the flow-induced vibration test device when the mixed fluid flows into the test section; the test data includes at least one of acceleration data, strain data, pressure data, temperature data and flow rate data; The test data analysis module is used to analyze the preset fluid flow parameters and the test data corresponding to the preset fluid flow parameters to determine the vibration characteristics of multiple non-linear heat transfer tubes when flow-induced vibration occurs.

10. A design method for a flow-induced vibration testing device, characterized in that, Applied to the flow-induced vibration testing apparatus as described in any one of claims 1-7, the method comprises: Obtain an initial model of the flow-induced vibration test device; the initial model includes an initial flow channel and an initial test simulation body, the initial test simulation body includes multiple non-linear heat transfer tubes and support components; Flow-induced vibration analysis and flow field analysis are performed on the initial model to determine the first initial parameters of the initial flow channel and the multiple non-linear heat transfer tubes. The first initial parameters are the parameters of the initial flow channel and the multiple non-linear heat transfer tubes when the initial model meets the preset envelope requirement and the flow field of the initial model meets the preset flow field requirement. Assign the first initial parameters to the initial flow channel and the multiple non-linear heat transfer tubes in the initial model to generate a first intermediate model. Perform stress analysis on the first intermediate model to determine the second initial parameters of the support components in the first intermediate model that meet the preset stress conditions. The second initial parameters are assigned to the support components in the first intermediate model to obtain the second intermediate model. A fluid mixing experiment is conducted on the second intermediate model to determine the third initial parameters of the initial flow channel in the second intermediate model that meet the preset fluid mixing experiment conditions. The flow-induced vibration test device is generated based on the first initial parameters of the initial flow channel and the multiple non-linear heat transfer tubes, the second initial parameters of the support assembly, and the third initial parameters of the initial flow channel.

11. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method of claim 8.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the method of claim 8.

13. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method of claim 8.

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