A test device for verifying the principle of flow-induced vibration of tube bundle and its use method

Abstract

The present invention provides a test device for verifying the principle of flow-induced vibration of a tube bundle, which includes a flow channel groove and a test simulation body. The flow channel groove includes: an inlet section, an inlet stable section, a test section, an outlet stable section, and an outlet section. The test simulation body is fixed in the test section, and the test simulation body includes a groove and a test tube installed inside the groove. The test tube can be a single straight tube, a straight tube bundle, a single curved tube, or a curved tube bundle; when the test tube is a single straight tube or a straight tube bundle, the inlet stable section, the test section, and the outlet stable section are all rectangular flow channel grooves, and the groove is a rectangular groove; when the test tube is a single curved tube or a curved tube bundle, the inlet stable section, the test section, and the outlet stable section are all fan-shaped flow channel grooves, and the groove is a fan-shaped groove. One end of the test tube is fixed at the bottom of the groove, and the other end of the test tube is a free end. The present invention can verify the principle of flow-induced vibration of curved tube bundles by comparing the test results of curved tubes and straight tubes.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering tests, and in particular to a test device for verifying the principle of tube bundle flow-induced vibration and a use method thereof. Background Art

[0002] At present, nuclear power steam generators or heat exchangers in the petrochemical industry all carry out tube bundle flow-induced vibration tests on straight tubes or U-shaped tubes. There is currently no verification test on the principle of tube bundle flow-induced vibration applied to spiral coils.

[0003] For spiral coil steam generators, the spiral heat transfer tubes are subjected to flow-induced vibrations caused by the flow of reactor coolant. There are many mechanisms for flow-induced vibrations caused by the fluid outside the tubes, such as turbulent random vibrations, vortex shedding vibrations, and flow elastic instability vibrations. The above types of flow-induced vibration phenomena may cause wear between the spiral tubes and the support bars, thereby causing damage to the spiral heat transfer tubes. Therefore, it is necessary to evaluate the flow-induced vibration of the spiral heat transfer tube bundle.

[0004] The semi-empirical formulas for the analysis and calculation of various mechanisms of flow-induced vibration are all derived from tests on straight tubes and equidistantly distributed (equilateral triangle or square) straight tube bundles. For heat transfer tube bundles with spiral coils and non-equidistant distribution, the applicability of the formulas and parameters used in these specifications needs to be additionally verified, and experimental research needs to be carried out on the flow-induced vibration phenomenon of space bends and bend bundles. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a test device and a method for using the test device for verifying the flow-induced vibration principle of a tube bundle. Not only can flow-induced vibration tests be carried out on a single straight tube and a straight tube bundle, but flow-induced vibration tests can also be carried out on a single curved tube and a curved tube bundle. By comparing the test results of the curved tube and the straight tube, the principle of flow-induced vibration of the curved tube bundle can be verified.

[0006] The present invention provides a test device for verifying the principle of flow-induced vibration of a tube bundle, comprising a flow channel and a test simulation body, wherein the flow channel comprises: an inlet section, an inlet stabilization section, a test section, an outlet stabilization section, and an outlet section matching the test simulation body;

[0007] Wherein, the test simulation body is fixedly installed on the test section, and the test simulation body includes a groove and a test tube installed inside the groove, and the test tube is one of a single straight tube, a straight tube bundle, a single curved tube, and a curved tube bundle; when the test tube is a single straight tube or a straight tube bundle, the inlet stable section, the test section, and the outlet stable section are all rectangular flow channel grooves, and the groove is a rectangular groove; when the test tube is a single curved tube or a curved tube bundle, the inlet stable section, the test section, and the outlet stable section are all fan-shaped flow channel grooves, and the groove is a fan-shaped groove;

[0008] One end of the test tube is fixed to the bottom of the groove, and the other end of the test tube is a free end. The two side surfaces of the groove are two opposite planes, and an observation window is fixed to the top of the groove. The bottom, two side surfaces and top of the groove together constitute a closed flow channel.

[0009] Preferably, the straight tube bundle is a plurality of straight tubes distributed in an array;

[0010] The width of the flow channel between the outermost straight tube of the plurality of straight tubes distributed in the array and the side surface of the groove is half the width of the flow channel between two adjacent straight tubes of the plurality of straight tubes distributed in the array;

[0011] The width between the single straight tube and the side wall of the groove is greater than twice the diameter of the single straight tube.

[0012] Preferably, the bend bundle is a plurality of bends arranged in an array; the width of the flow channel between the outermost bend in the plurality of bends arranged in an array and the side surface of the groove is half the width of the flow channel between two adjacent bends in the plurality of bends arranged in an array.

[0013] Preferably, a base is fixed to the bottom of the groove by bolts, and one end of the test tube is welded to the base.

[0014] Preferably, a high-speed camera is installed outside the observation window;

[0015] An acceleration sensor is arranged on the inner wall of the straight tube or the inner wall of the curved tube of the test tube, and a plurality of strain gauges are installed along the circumferential direction on the outer wall of the straight tube or the outer wall of the curved tube of the test tube.

[0016] Preferably, two acceleration sensors are arranged on the inner wall of the straight tube or the inner wall of the curved tube in the test tube, one of which is located on the inner wall in the middle of the straight tube or the curved tube, and the other is located on the inner wall at the free end of the straight tube or the curved tube.

[0017] Preferably, the free end of each straight tube or curved tube in the test tube is sealed with a rubber stopper.

[0018] The present invention also provides a method for using a test device for verifying the principle of tube bundle flow-induced vibration, wherein the test device is the above-mentioned test device, and the method for using comprises the following steps:

[0019] S1. Increasing the fluid flow in the flow channel by increasing the flow in a step-by-step manner;

[0020] S2. When the fluid flow rate increases to a set target maximum value, the fluid flow rate is gradually reduced;

[0021] S3, when the fluid flow rate decreases to a set minimum value, returning to step S1 from the 1st to the nth time, and executing step S4 at the n+1th time;

[0022] S4, increasing the fluid flow rate in the flow channel groove in a stepwise manner until the test tube in the test simulation body reaches fatigue fracture;

[0023] Among them, in each of the above steps, the vibration acceleration and strain response time history curve of the test tube in the test simulation body are measured under different fluid flow rates to obtain the relationship between the vibration acceleration and strain of the test tube in the test simulation body and the fluid flow rate.

[0024] Preferably, the method further comprises the following steps:

[0025] When the test tube is a single straight tube, the fluid flow corresponding to the maximum point of vibration response when vortex shedding occurs in the straight tube in the test simulation body, and the fluid flow when vibration locking occurs in the straight tube in the test simulation body are obtained according to the relationship between the vibration acceleration and strain of the straight tube in the test simulation body and the fluid flow;

[0026] When the test tube is a plurality of straight tubes distributed in an array, the fluid flow corresponding to the maximum point of vibration response when turbulent excitation occurs in the straight tube in the test simulation body, or the fluid flow when fluid-elastic instability occurs in the straight tube in the test simulation body, is obtained according to the relationship between the vibration acceleration and strain of the straight tube in the test simulation body and the fluid flow.

[0027] Preferably, the method further comprises the following steps:

[0028] When the test pipe is a single curved pipe, the fluid flow corresponding to the maximum point of vibration response when vortex shedding occurs in the curved pipe in the test simulation body and the fluid flow when vibration locking occurs in the curved pipe in the test simulation body are obtained according to the relationship between the vibration acceleration and strain of the curved pipe in the test simulation body and the fluid flow;

[0029] When the test pipe is a plurality of curved pipes distributed in an array, the fluid flow corresponding to the maximum point of vibration response when turbulent excitation occurs in the curved pipe in the test simulation body, or the fluid flow when fluid-elastic instability occurs in the curved pipe in the test simulation body, is obtained according to the relationship between the vibration acceleration and strain of the curved pipe in the test simulation body and the fluid flow.

[0030] The implementation of the present invention has the following beneficial effects: the test section of the flow channel in the test device provided by the present invention is installed with a test simulation body, and the test pipe in the test simulation body is one of a single straight pipe, a straight pipe bundle, a single curved pipe, and a curved pipe bundle, and different pipe flow-induced vibration tests can be carried out respectively. The present invention can not only carry out flow-induced vibration tests on single straight pipes and straight pipe bundles, but also carry out flow-induced vibration tests on single curved pipes and curved pipe bundles. By comparing the test results of curved pipes and straight pipes, the principle of flow-induced vibration of curved pipe bundles can be verified. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a top view of a test device for the single straight tube flow-induced vibration principle provided by the present invention.

[0033] Figure 2 It is a side view of a test device for the flow-induced vibration principle of a single straight tube provided by the present invention.

[0034] Figure 3 It is a top view of the test device for the straight tube beam flow-induced vibration principle provided by the present invention.

[0035] Figure 4 It is a side view of a test device for the straight tube beam flow-induced vibration principle provided by the present invention.

[0036] Figure 5 It is a structural schematic diagram of a single straight tube test simulation body provided by the present invention.

[0037] Figure 6 It is a structural schematic diagram of the straight tube bundle test simulation body provided by the present invention.

[0038] Figure 7 It is a structural schematic diagram of a single bent pipe test simulation body provided by the present invention.

[0039] Figure 8 It is a structural schematic diagram of a bent pipe bundle test simulation body provided by the present invention.

[0040] Fig. 9 It is an array distribution diagram of multiple straight tubes in the straight tube bundle provided by the present invention.

[0041] Fig.10 It is a schematic diagram of installing the acceleration sensor provided by the present invention.

[0042] Fig.11 It is a schematic diagram of the installation and fixing method of the acceleration sensor provided by the present invention.

[0043] Fig.12 It is a schematic diagram of the installation method of the strain gauge provided by the present invention.

[0044] The accompanying drawings are marked as: 11, single straight tube test simulation body; 12, straight tube bundle test simulation body; 2, inlet section; 3, inlet stabilization section; 31, rectification section; 4, test section; 5, outlet stabilization section; 50, light inlet; 6, outlet section; 7, groove; 70, base; 8, test tube; 80, straight tube; 81, straight tube free end; 82, bent tube free end; 83, acceleration sensor; 84, strain gauge; 85, screw hole; 86, rubber sleeve; 9, observation window; A10, A11, A20, A21, flow channel. DETAILED DESCRIPTION

[0045] The present invention provides a test device for verifying the principle of flow-induced vibration of a tube bundle, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, it includes a flow channel and a test simulation body, and the flow channel includes: an inlet section 2, an inlet stable section 3, a test section 4, an outlet stable section 5, and an outlet section 6 that match the test simulation body. The fluid flows in from the fluid inlet R1 and flows out from the fluid outlet R2.

[0046] The test simulation body is fixedly installed in the test section 4, and the test simulation body includes a groove 7 and a test tube 8 installed in the groove 7. The test tube 8 is Figure 5 The single straight tube shown, Figure 6 The straight tube bundle shown, Figure 7 The single elbow shown, Figure 8 One of the bent tube bundles shown in the figure; when the test tube 8 is a single straight tube or a straight tube bundle, the inlet stable section 3, the test section 4 and the outlet stable section 5 are all rectangular flow channel grooves, and the groove 7 is a rectangular groove; when the test tube 8 is a single bent tube or a bent tube bundle, the inlet stable section 3, the test section 4 and the outlet stable section 5 are all fan-shaped flow channel grooves, and the groove 7 is a fan-shaped groove. Among them, Figure 2 The test simulation body shown is a single straight tube test simulation body 11. Figure 3 , Figure 4 The test simulation body shown is a straight tube bundle test simulation body 12.

[0047] One end of the test tube 8 is fixed to the bottom of the groove 7, and the other end of the test tube 8 is a free end (such as Figure 5 , 6 The straight tube free end 81 shown, Figure 7 , 8The free end 82 of the elbow shown in the figure), the two sides of the groove 7 are two opposite planes, and an observation window 9 is fixed on the top of the groove 7, and the bottom, two sides and top of the groove 7 together form a closed flow channel. An observation window 9 is also provided at the test section 4 located above the test simulation body, and a light inlet 50 is provided at the inlet stable section 3 or the outlet stable section 5 near the bottom of the test simulation body.

[0048] When the test simulation body in the test device includes a plurality of straight pipes distributed in an array or a plurality of curved pipes distributed in an array, the main pipe includes two inlet stabilization sections 3 between the inlet section 2 and the test section 4, and a rectifying section 31 is between the two inlet stabilization sections 3.

[0049] Furthermore, the straight tube bundle is a plurality of straight tubes arranged in an array; the width of the flow channel A11 between the outermost straight tube in the plurality of straight tubes arranged in an array and the side surface of the groove 7 is half the width of the flow channel between two adjacent straight tubes in the plurality of straight tubes arranged in an array. By imitating the straight tube bundle test piece with the same pitch ratio, adjusting the straight tube spacing along the fluid direction, a straight tube test simulation body with different pitch ratios can be obtained. The difference in spatial distribution between the straight tube bundle with the same pitch ratio and the straight tube bundle with different pitch ratios is shown in Fig. 9 shown.

[0050] The width between the single straight tube and the side wall of the groove 7 is greater than twice the diameter of the single straight tube. A flow channel A10 is formed between the single straight tube and the side wall of the groove 7.

[0051] The bend bundle is a plurality of bends arranged in an array; the width of the flow channel A21 between the outermost bend in the plurality of bends arranged in an array and the side of the groove is half the width of the flow channel between two adjacent bends in the plurality of bends arranged in an array.

[0052] Similar to the straight tube bundle, the curved tube bundle test simulation body also has two types of test simulation bodies: one with the same section diameter ratio and one with different section diameter ratios.

[0053] The width between the single curved pipe and the side wall of the groove is greater than twice the diameter of the single curved pipe. A flow channel A20 is formed between the single curved pipe and the side wall of the groove 7.

[0054] Furthermore, a base 70 is fixed to the bottom of the groove 7 by bolts, and one end of the test tube 8 is welded to the base 70 .

[0055] A high-speed camera is installed outside the observation window 9; an acceleration sensor 83 is arranged on the inner wall of the straight tube or the inner wall of the curved tube of the test tube 8, and a plurality of strain gauges 84 are installed along the circumferential direction on the outer wall of the straight tube or the outer wall of the curved tube of the test tube 8.

[0056] Two acceleration sensors 83 are arranged on the inner wall of the straight tube or the inner wall of the curved tube in the test tube 8, one of the acceleration sensors 83 is located on the inner wall in the middle of the straight tube or the curved tube, and the other acceleration sensor 83 is located on the inner wall of the free end of the straight tube or the curved tube.

[0057] The free end of each straight tube or curved tube in the test tube 8 is sealed with a rubber plug.

[0058] For a single straight pipe test simulation body, Fig.10 As shown, the vibration acceleration, displacement and strain of the pipe can be measured during the test by using an acceleration sensor 83, a high-speed camera and a strain gauge 84. Two acceleration sensors 83 are installed inside the pipe at the mid-span and free end respectively. The acceleration sensors 83 are fixed by screws and auxiliary installation devices. A rubber plug is used at the end of the pipe for waterproof sealing. The installation and fixing method of the acceleration sensor 83 is shown in FIG. Fig.11 , wherein the installation position of the acceleration sensor 83 is as follows Fig.11 As shown in B1, the auxiliary installation position of the acceleration sensor 83 is as follows Fig.11 As shown in B2, 80 is a straight tube and 85 is a screw hole. The top wall of the flow channel groove (groove 7) uses a transparent material as an observation window, and a high-speed camera is installed outside to take high-speed photos of the vibration displacement of the free end of the tube, which is convenient for subsequent image analysis. At a certain distance from the fixed end of the tube, four strain gauges 84 are evenly installed along the circumference of the outer wall of the tube. The outside of the strain gauge 84 is isolated and protected by a rubber sleeve 86. The installation method of the strain gauge 84 can be seen. Fig.12 .

[0059] The installation type, installation position and installation fixing method of the sensor in the single bent pipe test simulation body are the same as those of the single straight pipe test simulation body.

[0060] The straight tube bundle test simulation body and the bent tube bundle test simulation body are selected parts of the tubes for measurement, wherein the installation type, installation position and installation fixing method of the sensor are the same as those of the single straight tube test simulation body.

[0061] Each test simulation body is equipped with a measuring sensor, and the corresponding test device is connected to the hydraulic bench to carry out the corresponding flow-induced vibration test.

[0062] The present invention also provides a method for using a test device for verifying the principle of tube bundle flow-induced vibration. The test device is the above-mentioned test device, and the method for using comprises the following steps:

[0063] S1, increasing the fluid flow in the flow channel by increasing the flow in a step-by-step manner;

[0064] S2. When the fluid flow rate increases to the set target maximum value, the fluid flow rate is gradually reduced;

[0065] S3, when the fluid flow rate drops to the set minimum value, return to step S1 from the 1st to the nth time, and execute step S4 at the n+1th time;

[0066] S4, increasing the fluid flow rate in the flow channel groove in a stepwise manner until the test tube in the test simulation body reaches fatigue fracture;

[0067] In each of the above steps, the vibration acceleration and strain response time history curves of the test tube in the test simulation body are measured under different fluid flow rates to obtain the relationship between the vibration acceleration and strain of the test tube in the test simulation body and the fluid flow rate.

[0068] The method for using the test device for verifying the principle of tube bundle flow-induced vibration also includes the following steps:

[0069] When the test tube is a single straight tube, the fluid flow rate corresponding to the maximum point of vibration response when vortex shedding occurs in the straight tube in the test simulation body, and the fluid flow rate when vibration locking occurs in the straight tube in the test simulation body are obtained according to the relationship between the vibration acceleration and strain of the straight tube in the test simulation body and the fluid flow rate;

[0070] When the test tube is a plurality of straight tubes distributed in an array, the fluid flow corresponding to the maximum point of vibration response when turbulent excitation occurs in the straight tube in the test simulation body is obtained according to the relationship between the vibration acceleration and strain of the straight tube in the test simulation body and the fluid flow rate, or the fluid flow when fluid-elastic instability occurs in the straight tube in the test simulation body.

[0071] The method for using the test device for verifying the principle of tube bundle flow-induced vibration also includes the following steps:

[0072] When the test pipe is a single curved pipe, the fluid flow corresponding to the maximum point of vibration response when vortex shedding occurs in the curved pipe in the test simulation body, and the fluid flow when vibration locking occurs in the curved pipe in the test simulation body are obtained according to the relationship between the vibration acceleration and strain of the curved pipe in the test simulation body and the fluid flow;

[0073] When the test pipe is a plurality of curved pipes distributed in an array, the fluid flow corresponding to the maximum vibration response point when turbulent excitation occurs in the curved pipe in the test simulation body, or the fluid flow when fluid-elastic instability occurs in the curved pipe in the test simulation body, is obtained according to the relationship between the vibration acceleration and strain of the curved pipe in the test simulation body and the fluid flow.

[0074] The above method can be specifically illustrated by the following example:

[0075] (1) Single straight pipe flow-induced vibration test.

[0076] The fluid flow rate in the test device is increased in steps to obtain the vibration response of a single straight pipe at different flow rates (flow velocities). When the flow rate increases to the set target maximum value, the flow rate is gradually reduced to the set minimum value, and then the flow rate is increased again in steps to the set target maximum value. After the above process is repeated 3 times, when the flow rate reaches the set maximum value for the 4th time, the flow rate continues to be slowly increased in steps until the pipe reaches fatigue fracture. The test can be stopped after the pipe in the test simulation body breaks. For the acceleration and strain response time history curves obtained from the flow-induced vibration test, the relationship between the strain and acceleration vibration response of the measured pipe and the flow rate (flow velocity) is obtained by statistical analysis, and the curve is fitted. According to the fitting curve, the flow rate corresponding to the maximum point of the vibration response when vortex shedding occurs in the pipe in the test simulation body is obtained.

[0077] (2) Flow-induced vibration test of a single elbow.

[0078] Increase the flow rate in steps to obtain the vibration response of a single curved pipe at different flow rates (flow velocities). When the flow rate increases to the set target maximum value, gradually reduce the flow rate, and then increase the flow rate again in steps to the set target maximum value. After repeating the above process three times, when the flow rate reaches the set maximum value for the fourth time, continue to increase the flow rate slowly in steps until the pipe reaches fatigue fracture. The test can be stopped after the pipe breaks. For the acceleration and strain response time history curves obtained from the flow-induced vibration test, the relationship between the strain and acceleration vibration response of the measured pipe and the flow rate is obtained by statistical analysis, and the curve is fitted. According to the fitting curve, the flow rate corresponding to the maximum point of the vibration response when vortex shedding occurs in the pipe is obtained.

[0079] A comparative analysis was conducted on the acceleration, displacement and strain values ​​of a single straight pipe and a single curved pipe under the same flow step, and the difference in the same measurement parameters between the curved pipe and the straight pipe was checked. Based on the curved pipe measurement parameters, the empirical formula of the existing straight pipe was fitted and corrected.

[0080] (3) Straight tube beam flow-induced vibration test.

[0081] Increase the flow rate in steps to obtain the corresponding parameters such as vibration acceleration and vibration strain of the straight tube bundle at different flow rates (flow velocities). When the flow rate increases to the set target maximum value, the flow rate is gradually reduced, and then the flow rate is increased again in steps to the set target maximum value. After repeating the above process three times, when the flow rate reaches the set target maximum value for the fourth time, continue to increase the flow rate slowly in steps until a tube reaches fatigue fracture. The test can be stopped after the tube breaks. For the acceleration and strain response time history curves obtained from the flow-induced vibration test, the relationship between the strain and acceleration vibration response of the measured pipe and the flow rate is obtained by statistical analysis, and the curve is fitted. According to the fitting curve, the flow rate corresponding to the maximum point of the vibration response when turbulent excitation occurs in the straight tube bundle pipe, or the flow rate when "flow-elastic instability" occurs in the straight tube bundle pipe, is obtained.

[0082] According to the above implementation steps, flow-induced vibration tests were carried out on straight tube bundles with the same section diameter ratio and straight tube bundles with different section diameter ratios.

[0083] (4) Vibration characteristics of bent tube bundle and flow-induced vibration test.

[0084] Increase the flow rate in steps to obtain the corresponding parameters such as vibration acceleration and vibration strain of the bent pipe bundle at different flow rates (flow velocities). When the flow rate increases to the set target maximum value, the flow rate is gradually reduced, and then the flow rate is increased again in steps to the set target maximum value. After repeating the above process three times, when the flow rate reaches the set target maximum value for the fourth time, continue to increase the flow rate slowly in steps until a pipe reaches fatigue fracture. The test can be stopped after the pipe breaks. For the acceleration and strain response time history curves obtained from the flow-induced vibration test, the relationship between the strain and acceleration vibration response of the measured pipe and the flow rate is obtained by statistical analysis, and the curve is fitted. According to the fitting curve, the flow rate corresponding to the maximum point of vibration response when turbulent excitation occurs in the bent pipe bundle pipe, or the flow rate when "flow-elastic instability" occurs in the bent pipe bundle pipe, is obtained.

[0085] According to the above implementation steps, flow-induced vibration tests were carried out on the bend bundles with the same pitch-diameter ratio and the bend bundles with different pitch-diameter ratios.

[0086] A comparative analysis was conducted on the acceleration, displacement and strain values ​​of the curved tube bundle and the straight tube bundle under the same flow step, and the difference in the same measurement parameters between the curved tube bundle and the straight tube bundle was checked. Based on the measurement parameters of the curved tube bundle, the empirical formula of the existing straight tube bundle was fitted and corrected.

[0087] The test device provided by the present invention has the following advantages:

[0088] 1) The test device provided by the present invention has a simple structure and can greatly reduce the difficulty of processing and manufacturing and reduce the test cost through diversified module design.

[0089] 2) The present invention adopts a cantilever beam for fixing, which makes it easier to realize the flow-induced vibration phenomenon and greatly reduces the specification requirements for the hydraulic test bench.

[0090] 3) The present invention mainly conducts experiments on the principle of flow-induced vibration of curved tube bundles, and can also conduct experiments on the principle of flow-induced vibration of straight tube bundles. The test results and conclusions are not limited to a specific engineering product, and can be widely applied to most engineering products including curved tubes and curved tube bundles and straight tubes and straight tube bundles.

[0091] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A test device for verifying the principle of flow-induced vibration of a tube bundle, characterized in that: It includes a flow channel and a test simulation body, wherein the flow channel includes: an inlet section, an inlet stabilization section, a test section, an outlet stabilization section, and an outlet section that match the test simulation body; Wherein, the test simulation body is fixedly installed on the test section, and the test simulation body includes a groove and a test tube installed inside the groove, and the test tube is one of a single straight tube, a straight tube bundle, a single curved tube, and a curved tube bundle; when the test tube is a single straight tube or a straight tube bundle, the inlet stable section, the test section, and the outlet stable section are all rectangular flow channel grooves, and the groove is a rectangular groove; when the test tube is a single curved tube or a curved tube bundle, the inlet stable section, the test section, and the outlet stable section are all fan-shaped flow channel grooves, and the groove is a fan-shaped groove; One end of the test tube is fixed to the bottom of the groove, and the other end of the test tube is a free end. The two side surfaces of the groove are two opposite planes, and an observation window is fixed to the top of the groove. The bottom, two side surfaces and top of the groove together constitute a closed flow channel.

2. The test device for verifying the principle of flow-induced vibration of a tube bundle according to claim 1, characterized in that: The straight tube bundle is a plurality of straight tubes distributed in an array; The width of the flow channel between the outermost straight tube of the plurality of straight tubes distributed in the array and the side surface of the groove is half the width of the flow channel between two adjacent straight tubes of the plurality of straight tubes distributed in the array; The width between the single straight tube and the side wall of the groove is greater than twice the diameter of the single straight tube.

3. The test device for verifying the principle of flow-induced vibration of a tube bundle according to claim 1, characterized in that: The bent pipe bundle is a plurality of bent pipes distributed in an array; the flow channel width between the outermost bent pipe in the plurality of bent pipes distributed in an array and the side surface of the groove is half the flow channel width between two adjacent bent pipes in the plurality of bent pipes distributed in an array.

4. The test device for verifying the principle of flow-induced vibration of a tube bundle according to claim 1, characterized in that: A base is fixed to the bottom of the groove by bolts, and one end of the test tube is welded to the base.

5. The test device for verifying the principle of flow-induced vibration of tube bundle according to claim 1, characterized in that: A high-speed camera is installed outside the observation window; An acceleration sensor is arranged on the inner wall of the straight tube or the inner wall of the curved tube of the test tube, and a plurality of strain gauges are installed along the circumferential direction on the outer wall of the straight tube or the outer wall of the curved tube of the test tube.

6. The test device for verifying the principle of flow-induced vibration of a tube bundle according to claim 5, characterized in that: Two acceleration sensors are arranged on the inner wall of the straight tube or the inner wall of the curved tube in the test tube, one of which is located on the inner wall in the middle of the straight tube or the curved tube, and the other is located on the inner wall at the free end of the straight tube or the curved tube.

7. The test device for verifying the principle of flow-induced vibration of a tube bundle according to claim 5, characterized in that: The free end of each straight tube or curved tube in the test tube is sealed with a rubber plug.

8. A method for using a test device for verifying the principle of flow-induced vibration of a tube bundle, characterized in that: The test device is the test device according to any one of claims 1 to 7, and the method of use comprises the following steps: S1, increasing the fluid flow in the flow channel by increasing the flow in a step-by-step manner; S2. When the fluid flow rate increases to a set target maximum value, the fluid flow rate is gradually reduced; S3, when the fluid flow rate decreases to a set minimum value, returning to step S1 from the 1st to the nth time, and executing step S4 at the n+1th time; S4, increasing the fluid flow rate in the flow channel groove in a stepwise manner until the test tube in the test simulation body reaches fatigue fracture; Among them, in each of the above steps, the vibration acceleration and strain response time history curve of the test tube in the test simulation body are measured under different fluid flow rates to obtain the relationship between the vibration acceleration and strain of the test tube in the test simulation body and the fluid flow rate.

9. The method for using the test device for verifying the principle of tube bundle flow-induced vibration according to claim 8, characterized in that: The following steps are also included: When the test tube is a single straight tube, the fluid flow corresponding to the maximum point of vibration response when vortex shedding occurs in the straight tube in the test simulation body, and the fluid flow when vibration locking occurs in the straight tube in the test simulation body are obtained according to the relationship between the vibration acceleration and strain of the straight tube in the test simulation body and the fluid flow; When the test tube is a plurality of straight tubes distributed in an array, the fluid flow corresponding to the maximum point of vibration response when turbulent excitation occurs in the straight tube in the test simulation body, or the fluid flow when fluid-elastic instability occurs in the straight tube in the test simulation body, is obtained according to the relationship between the vibration acceleration and strain of the straight tube in the test simulation body and the fluid flow.

10. The method for using the test device for verifying the principle of tube bundle flow-induced vibration according to claim 9, characterized in that: The following steps are also included: When the test pipe is a single curved pipe, the fluid flow corresponding to the maximum point of vibration response when vortex shedding occurs in the curved pipe in the test simulation body and the fluid flow when vibration locking occurs in the curved pipe in the test simulation body are obtained according to the relationship between the vibration acceleration and strain of the curved pipe in the test simulation body and the fluid flow; When the test pipe is a plurality of curved pipes distributed in an array, the fluid flow corresponding to the maximum point of vibration response when turbulent excitation occurs in the curved pipe in the test simulation body, or the fluid flow when fluid-elastic instability occurs in the curved pipe in the test simulation body, is obtained according to the relationship between the vibration acceleration and strain of the curved pipe in the test simulation body and the fluid flow.

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