Pipeline thermal cycle visualization test system and method

Abstract

The invention discloses a pipeline thermal cycle visualization test system and method.The test system comprises a test section pipeline, the test section pipeline comprises a main pipeline (1), a branch pipeline (2) and an injection pipe section (3), and the injection pipe section (3) and the branch pipeline (2) are communicated to different positions of the main pipeline (1) respectively; the injection pipe section (3) is used for injecting fluid different from fluid components in the main pipeline (1) into the main pipeline (1), and the branch pipeline (2) is vertically connected to the main pipeline (1); the test method comprises the steps that the temperature and the flow speed of water flow passing through the test section pipeline are adjusted to be within the set range, the vortex generators (1a and 2a) are started, the injection pipe section (3) is started, and flowing of liquid in the test section pipeline is monitored. And the vortex generation position and the growth process in the thermal cycle phenomenon can be monitored, and a powerful reference is provided for exploration of the thermal cycle mechanism of the nuclear power plant pipeline.

Description

Technical Field

[0001] The invention relates to the field of pipeline fatigue analysis research in the nuclear energy field, and in particular to a pipeline thermal cycle visualization test system and method. Background Art

[0002] T-pipe is one of the most common component forms in nuclear power plant design, used for the intersection or diversion of fluids. When high-temperature water and low-temperature water in nuclear power plants are mixed through T-pipes, the temperature of the inner surface of the pipe changes periodically, which may cause thermal fatigue damage to the pipe. OPDE has recorded more than 60 safety accidents such as non-through-wall cracks and leaks, among which material failure caused by thermal fatigue is considered to be the main cause. At the same time, in the piping system of nuclear power plants, vortices, as a complex flow phenomenon, play a key role in the thermal cycle of the pipeline. The formation and development of vortices not only affect the heat transfer efficiency of the fluid in the T-pipe, but may also cause local stress concentration of the pipeline material, thereby accelerating the fatigue damage process of the T-pipe.

[0003] The influence of eddy currents on pipeline thermal cycles is multifaceted. The formation of eddy currents will increase the mixing and turbulence of the fluid, leading to local temperature fluctuations on the inner wall of the pipeline, which in turn affects the thermal fatigue life of the pipeline material. Secondly, the presence of eddy currents will change the scouring effect of the fluid on the inner wall of the pipeline, which may cause local wear or corrosion, further affecting the structural integrity of the pipeline.

[0004] In recent years, the fatigue analysis of nuclear power plant pipelines has attracted widespread attention from researchers, such as "Research on Thermal Fatigue Test Methods and Life Prediction Models for Nuclear Power Plant Pipelines", "Cyclic Thermal Fatigue Assessment Methods for T-Type Tee Pipes under Mixed Action of Cold and Hot Fluids", and "Design and Numerical Simulation of Thermal Fatigue Tests for High-Temperature and High-Pressure Water Pipelines". However, there are few reports in the current public literature on the visualized thermal cycle research devices for horizontal pipes in nuclear power plants. The visualization of thermal cycles in horizontal pipes is of great value. Observing the growth process of vortices makes the characteristics of vortices more intuitive and facilitates model prediction. Secondly, observing the location where vortices are generated facilitates pipeline fatigue analysis. By measuring the three-dimensional flow velocity of vortices, it is convenient to analyze the action mechanism of vortices.

[0005] Patent document CN101598258B discloses a device and method for reducing thermal fatigue during the mixing process of hot and cold fluids in a T-shaped pipe, wherein the device is composed of a porous medium installed in the hot and cold fluid mixing zone of the T-shaped pipe. By filling the porous medium in the fluid mixing zone of the T-shaped pipe, the velocity fluctuation and temperature fluctuation during the mixing process of the hot and cold fluids are constrained, thereby weakening the thermal shock of the hot and cold fluids on the pipe wall, effectively reducing the instantaneous temperature and the time-averaged temperature as well as the temperature fluctuation amplitude, improving the energy spectrum characteristics of the instantaneous temperature fluctuation, and reducing the thermal fatigue of the T-shaped pipe. However, the problem of exploring the further impact of the vortex generation in the T-shaped pipe on the pipe thermal cycle is not solved.

[0006] In the patent document CN114894435B, a device and method for visualizing fluid in a branch-shaped channel under marine conditions are disclosed, wherein the experimental device includes a marine condition simulation platform, a visualization experimental section, an optical measurement system, a three-dimensional positioning stand, a liquid supply system, a temperature control system, and an experimental parameter online monitoring system; the optical measurement system includes a laser generator, a CCD camera, a lens assembly, and a remote computer; the liquid supply system is used to realize the circulation of the working fluid, and cooperates with the temperature control system and the experimental parameter online monitoring system to realize the required experimental working conditions; the CCD camera of the optical measurement system is fixed on the marine condition simulation platform in parallel with the visualization experimental section through a three-dimensional positioning stand, and moves synchronously with the marine condition simulation platform. The present invention also discloses a method for visualizing the mixing of fluid flow in a branch-shaped channel under marine conditions, which can obtain the mixing characteristics of fluid flow in a branch-shaped channel under marine conditions in real time and visually, but does not solve the problem of further affecting the thermal cycle of the pipeline by exploring the vortex generation in the T-shaped pipeline.

[0007] In summary, the above two existing patents do not solve the problem of exploring the further impact of vortex generation in the T-type pipe on the thermal cycle of the pipe. Summary of the invention

[0008] Based on the above technical problems, the present invention proposes a pipeline thermal cycle visualization test system and method to solve the problem of exploring the further impact of eddy current generation in T-type pipelines on pipeline thermal cycle.

[0009] To achieve the above purpose, the present invention also proposes a pipeline thermal cycle visualization test system

[0010] A pipeline thermal cycle visualization test system, comprising:

[0011] It includes a test section pipeline; the test section pipeline includes a main pipeline, a branch pipeline and an injection pipeline section, and the injection pipeline section and the branch pipeline are respectively connected to different positions of the main pipeline;

[0012] The injection pipe section is used to inject a fluid having a different fluid component from the main pipe into the main pipe, and the branch pipe is vertically connected to the main pipe.

[0013] Furthermore, the test section pipeline includes a plurality of vortex generators.

[0014] The plurality of vortex generators are respectively disposed inside the main pipe and inside the branch pipe.

[0015] Furthermore, the test section pipeline includes a rectangular transparent pipe.

[0016] The rectangular transparent pipes are respectively arranged outside the main pipe and the branch pipe.

[0017] Further, comprising a filler,

[0018] The filler is filled in the gap between the rectangular transparent pipe and the test section pipeline.

[0019] Furthermore, the injection tube section is arranged outside the rectangular transparent pipe.

[0020] Furthermore, the filler has a concentration of 10%-12% saline or a concentration of 10%-15% boric acid.

[0021] Further, comprising a coolant,

[0022] The coolant flows through the main line and the branch line.

[0023] Further, the relationship between the refractive index α1 of the filler and the refractive index α2 of the coolant is |α1-α2|≤0.1;

[0024] The relationship between the temperature t1 of the filler and the temperature t2 of the coolant is |t1-t2|≤5°C.

[0025] Furthermore, the test section pipeline includes a filler loop,

[0026] The filler loop is connected to the outside of the rectangular transparent pipe.

[0027] Furthermore, the main pipeline and the branch pipeline are both made of transparent material.

[0028] Furthermore, the refractive index α of the main pipeline and the branch pipeline is 1.5-1.8.

[0029] Furthermore, the injection pipe section includes a tracking particle injection pipe section, a developer injection pipe section and a fluid injection pipe section.

[0030] The tracking particles of the tracking particle injection tube section include aluminum powder with a particle size of 40 μm-50 μm, synthetic cotton particles with a particle size of 80 μm-100 μm, or glass particles with a particle size of 70 μm-90 μm;

[0031] The developer of the developer injection tube section includes metol-p-aminobenzene sulfate, hydroquinone or phenidone.

[0032] Furthermore, the fluid injection pipe section includes a high-density fluid and a low-density fluid.

[0033] The high-density fluid includes saturated salt water, carbon tetrachloride or chlorobenzene;

[0034] The low-density fluid includes thermal conductive silicone oil, cooling oil, kerosene or ethanol.

[0035] Including rectifier, voltage stabilizer, electric heater and flow meter,

[0036] The rectifier, the voltage stabilizer, the electric heater and the flow meter are sequentially arranged upstream of the test section pipeline.

[0037] To achieve the above object, the present invention also provides a pipeline thermal cycle visualization test method.

[0038] A test method using the above pipeline thermal cycle visualization test system comprises:

[0039] S1: Adjust the water flow temperature and flow rate through the test section pipeline to within the set range;

[0040] S2: Start the vortex generator, open the injection pipe section, and monitor the liquid flow inside the test section pipeline.

[0041] Furthermore, the step S1 includes:

[0042] The variable frequency pump and the electric heater are turned on, and the voltage stabilizer is adjusted so that the pressure of the system is 7.5 MPa-8.5 MPa and the temperature is 250°C-270°C.

[0043] Furthermore, the step S1 further includes:

[0044] The variable frequency pump is adjusted and the flow rate is observed by a flow meter so that the flow rate of water in the system is 8m / s-12m / s.

[0045] Furthermore, the step S2 includes:

[0046] The eddy current generated inside the test section pipeline is monitored by moving a panoramic camera device along the flow direction of the liquid in the test section pipeline.

[0047] Furthermore, the step S2 includes:

[0048] First, the eddy current is identified by the panoramic camera device, and the distance between the panoramic camera device and the eddy current along the moving direction is measured. If the distance is greater than 0.2m, the moving speed of the panoramic camera device is increased. If the distance is less than or equal to 0.2m, the moving speed is maintained to monitor the eddy current.

[0049] Furthermore, the step S2 includes:

[0050] The tracking particles inside the test section pipeline are monitored by a particle velocimeter.

[0051] Based on the above technical solution, the present invention has at least the following beneficial effects:

[0052] 1. The present invention proposes a pipeline thermal cycle visualization test system and method. Through the design of high-temperature and high-pressure resistant transparent pipelines, combined with a development monitoring system and a particle image velocimeter, a comprehensive visualization of the thermal cycle test phenomena of the horizontal pipes of a pressurized water reactor nuclear power plant is achieved, which not only improves the observation accuracy of the fluid flow trajectory and the vortex growth process, but also effectively weakens the refraction effect of light through the design of a rectangular high-temperature and high-pressure resistant transparent pipeline casing, making the development observation more accurate and improving the accuracy of monitoring the growth process of a single vortex during the flow process.

[0053] 2. The present invention proposes a pipeline thermal cycle visualization test system and method, which can realize the precise injection of developer, tracking particles, high-density or low-density fluids through liquid injection pipe sections according to the needs of various test conditions, and realize flexible adjustment of the test section pipeline angle through flange connections, so as to realize the test of upward, downward and side branch pipelines, and meet the various positions of T-shaped pipelines in actual situations. The configuration of the liquid vortex generator allows the generation and control of vortices according to the test conditions, which increases the controllability and adaptability of the test. The test system can also accurately control the temperature and flow of the loop coolant through equipment such as variable frequency pumps, electric heaters, and voltage stabilizers, further enhancing the versatility and flexibility of the test.

[0054] 3. The present invention proposes a pipeline thermal cycle visualization test system and method. The development of this system provides strong support for the study of thermal fatigue phenomena in nuclear power plant pipelines, and helps to deeply understand and predict the thermal fatigue damage mechanism, thereby preventing and reducing potential safety accidents. The vortex generator can be precisely controlled to control the test conditions and achieve comprehensive monitoring of fluid dynamics behavior. The system not only improves the research level of nuclear power plant pipeline safety and reliability, but also promotes the advancement of pipeline fatigue analysis technology in the nuclear energy field. In addition, the high adaptability and flexibility of the system make it an important tool for research in the nuclear energy field, which helps to promote the development and innovation of related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0056] Figure 1 A schematic diagram of the structure of a pipeline thermal cycle visualization test system according to an embodiment is shown;

[0057] Figure 2 A schematic diagram of the three-dimensional structure of a test section pipeline of an embodiment is shown;

[0058] Figure 3 A schematic cross-sectional view of a test section pipeline of an embodiment is shown.

[0059] The above-mentioned drawings include the following reference numerals:

[0060] 1. Main pipeline; 2. Branch pipeline; 3. Injection pipe section; 4. Rectifier; 5. Voltage stabilizer; 6. Stainless steel pipeline; 7. Cooler; 8. Electric heater; 9. Flow meter; 10. Frequency conversion pump; 11. Filter; 12. Coolant; 13. Filler circuit; 13a. Filler;

[0061] 1a, vortex generator; 1b, rectangular transparent pipe;

[0062] 2a, vortex generator; 2b, rectangular transparent pipe;

[0063] 3a, tracking particle injection section; 3b, developer injection section; 3c, high-density or low-density fluid injection section. DETAILED DESCRIPTION

[0064] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0065] The present invention is further described in detail below in conjunction with specific embodiments, and these embodiments cannot be understood as limiting the scope of protection claimed by the present invention. The term "including" when used indicates the existence of a feature, but does not exclude the existence or addition of one or more other features; the orientation or position relationship indicated by the terms "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0066] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0067] Example

[0068] The present invention provides a pipeline thermal cycle visualization test system, such as Figure 1The test section pipeline is shown as including a main pipeline 1, a branch pipeline 2 and an injection pipeline section 3, and the injection pipeline section 3 and the branch pipeline 2 are respectively connected to different positions of the main pipeline 1;

[0069] The injection pipe section 3 is used to inject a fluid having a different fluid component from the main pipe 1 into the main pipe 1 , and the branch pipe 2 is vertically connected to the main pipe 1 .

[0070] Furthermore, the diameter of the main pipeline 1 is larger than the diameter of the branch pipeline 2 to facilitate flow intensity control. The vortex generator 1a and the vortex generator 2a can be set in both the main pipeline 1 and the branch pipeline 2, or only in the main pipeline 1 or only in the branch pipeline 2.

[0071] Furthermore, if Figure 2 As shown, the filler loop 13 is connected to the outside of the rectangular transparent pipe 1a for filling the filler 13a.

[0072] Preferably, if Figure 3 As shown, the coolant 12 is water, the filler 13a is brine with a concentration of 13%, the refractive index α2 of the coolant 12 is 1.33, the refractive index α1 of the filler 13a is 1.5, the temperature of the coolant 12 is 260°C, the temperature of the filler 13a is 265°C, the pressure in the test system is 8Mpa, the flow rate of the coolant 12 is 10m / s, and the refractive index α of the main line 1 and the branch line 2 is 1.6.

[0073] To achieve the above object, the present invention further proposes a pipeline thermal cycle visualization test method, using the pipeline thermal cycle visualization test system described above, comprising the following steps:

[0074] S1: Adjust the water flow temperature and flow rate through the test section pipeline to within the set range;

[0075] S2: Start the vortex generators 1a and 2a, open the injection pipe section 3, and monitor the flow of liquid inside the test section pipeline.

[0076] Furthermore, the step S1 includes:

[0077] The variable frequency pump 10 and the electric heater 8 were turned on, and the voltage stabilizer 5 was adjusted so that the pressure of the system was 8 MPa and the temperature was 260°C.

[0078] Furthermore, the step S1 further includes:

[0079] The variable frequency pump 10 is adjusted, and the flow rate is observed by the flow meter 9 so that the flow rate of water in the system is 10 m / s.

[0080] Furthermore, the step S2 includes:

[0081] The eddy current generated inside the test section pipeline is monitored by moving a panoramic camera device along the flow direction of the liquid in the test section pipeline.

[0082] In a specific implementation, hydroquinone is injected into the main pipe 1 as a developer at an injection speed of 0.1 L / min through the injection pipe section 3, the pipeline vortex generator 1a in the main pipe 1 is started, and the vortex generated in the main pipe 1 is photographed by a panoramic camera device.

[0083] Furthermore, carbon tetrachloride is injected into the main pipe 1 as a high-density fluid at an injection speed of 0.1 L / min through the injection pipe section 3, the pipeline vortex generator 1a in the main pipe 1 is started, and the vortex generated in the main pipe 1 is photographed by a panoramic camera device.

[0084] Furthermore, cooling oil as a low-density fluid is injected into the main pipe 1 through the injection pipe section 3 at an injection speed of 0.1 L / min, the pipeline vortex generator 1a in the main pipe 1 is started, and the vortex generated in the main pipe 1 is photographed by a panoramic camera device.

[0085] Furthermore, the step S2 includes:

[0086] First, the eddy current is identified by the panoramic camera device, and the distance between the panoramic camera device and the eddy current in the moving direction is measured. If the distance is greater than 0.2 m, the moving speed of the panoramic camera device is increased. If it is less than 0.2 m, the moving speed is maintained to monitor the eddy current.

[0087] Furthermore, the step S2 includes:

[0088] The tracking particles inside the test section pipeline are monitored by a particle velocimeter.

[0089] In the specific implementation, aluminum powder fluid with a particle size of 45 μm is injected into the main pipeline 1 at an injection speed of 0.1 L / min through the injection pipe segment 3, the pipeline vortex generator 1a in the main pipeline 1 is started, and the tracking particles in the main pipeline 1 are measured in three dimensions through the particle velocimeter.

[0090] In summary, it can be seen from the above description that the above embodiments of the present invention achieve the following technical effects:

[0091] 1. The present invention proposes a pipeline thermal cycle visualization test system and method. Through the design of high-temperature and high-pressure resistant transparent pipelines, combined with a development monitoring system and a particle image velocimeter, a comprehensive visualization of the thermal cycle test phenomena of the horizontal pipes of a pressurized water reactor nuclear power plant is achieved, which not only improves the observation accuracy of the fluid flow trajectory and the vortex growth process, but also effectively weakens the refraction effect of light through the design of a rectangular high-temperature and high-pressure resistant transparent pipeline casing, making the development observation more accurate and improving the accuracy of monitoring the growth process of a single vortex during the flow process.

[0092] 2. The present invention proposes a pipeline thermal cycle visualization test system and method, which can realize the precise injection of developer, tracking particles, high-density or low-density fluids through liquid injection pipe sections according to the needs of various test conditions, and realize flexible adjustment of the test section pipeline angle through flange connections, so as to realize the test of upward, downward and side branch pipelines, and meet the various positions of T-shaped pipelines in actual situations. The configuration of the liquid vortex generator allows the generation and control of vortices according to the test conditions, which increases the controllability and adaptability of the test. The test system can also accurately control the temperature and flow of the loop coolant through equipment such as variable frequency pumps, electric heaters, and voltage stabilizers, further enhancing the versatility and flexibility of the test.

[0093] 3. The present invention proposes a pipeline thermal cycle visualization test system and method. The development of this system provides strong support for the study of thermal fatigue phenomena in nuclear power plant pipelines, and helps to deeply understand and predict the thermal fatigue damage mechanism, thereby preventing and reducing potential safety accidents. The vortex generator can be precisely controlled to control the test conditions and achieve comprehensive monitoring of fluid dynamics behavior. The system not only improves the research level of nuclear power plant pipeline safety and reliability, but also promotes the advancement of pipeline fatigue analysis technology in the nuclear energy field. In addition, the high adaptability and flexibility of the system make it an important tool for research in the nuclear energy field, which helps to promote the development and innovation of related technologies.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0095] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0096] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A pipeline thermal cycle visualization test system, characterized in that: The test section pipeline comprises a main pipeline (1), a branch pipeline (2) and an injection pipeline section (3), and the injection pipeline section (3) and the branch pipeline (2) are respectively connected to different positions of the main pipeline (1); The injection pipe section (3) is used to inject a fluid having a different composition from the fluid in the main pipe (1) into the main pipe (1), and the branch pipe (2) is vertically connected to the main pipe (1).

2. The system according to claim 1, characterized in that: The test section pipeline comprises a plurality of vortex generators (1a, 2a), The plurality of vortex generators (1a, 2a) are respectively arranged inside the main pipeline (1) and / or inside the branch pipeline (2).

3. The system according to claim 1, characterized in that: The test section pipeline comprises a rectangular transparent pipe (1b, 2b), The rectangular transparent pipes (1b, 2b) are respectively arranged outside the main pipe (1) and the branch pipe (2).

4. The system according to claim 3, characterized in that: comprising a filler (13a), The filler (13a) is filled in the gap between the rectangular transparent pipe (1b, 2b) and the test section pipeline.

5. The system according to claim 3, characterized in that: The injection tube section (3) is arranged outside the rectangular transparent pipe (1b, 2b).

6. The system according to claim 4, characterized in that: The filler (13a) has a concentration of 10%-12% saline or a concentration of 10%-15% boric acid.

7. The system according to claim 4, characterized in that: comprising a coolant (12), The coolant (12) flows through the main pipeline (1) and the branch pipeline (2).

8. The system according to claim 7, characterized in that: The relationship between the refractive index α1 of the filler (13a) and the refractive index α2 of the coolant (12) is |α1-α2|≤0.1; The relationship between the temperature t1 of the filler (13a) and the temperature t2 of the coolant (12) is |t1-t2|≤5°C.

9. The system according to claim 4, characterized in that: The test section pipeline comprises a filler loop (13), The filler loop (13) is connected to the outside of the rectangular transparent pipe (1b, 2b).

10. The system according to claim 1, characterized in that: The main pipeline (1) and the branch pipeline (2) are both made of transparent material.

11. The system according to claim 1, characterized in that: The refractive index α of the main pipeline (1) and the branch pipeline (2) is 1.5-1.

8.

12. The system according to claim 1, characterized in that: The injection tube section (3) comprises a tracking particle injection tube section (3a), a developer injection tube section (3b) and a fluid injection tube section (3c), wherein the tracking particles of the tracking particle injection tube section (3a) comprise aluminum powder with a particle size of 40 μm-50 μm, synthetic cotton particles with a particle size of 80 μm-100 μm or glass particles with a particle size of 70 μm-90 μm; The developer of the developer injection tube section (3b) includes metol-p-aminobenzene sulfate, hydroquinone or phenidone.

13. The system according to claim 12, characterized in that: The fluid injection pipe section (3c) comprises a high-density fluid and a low-density fluid. The high-density fluid includes saturated salt water, carbon tetrachloride or chlorobenzene; The low-density fluid includes thermal conductive silicone oil, cooling oil, kerosene or ethanol.

14. The system according to claim 1, characterized in that: It includes a rectifier (4), a voltage stabilizer (5), an electric heater (8) and a flow meter (9), The rectifier (4), the voltage stabilizer (5), the electric heater (8) and the flow meter (9) are sequentially arranged upstream of the test section pipeline.

15. A test method using the pipeline thermal cycle visualization test system as claimed in claim 1, characterized in that: include: S1: Adjust the water flow temperature and flow rate through the test section pipeline to within the set range; S2: Start the vortex generators (1a, 2a), open the injection pipe section (3), and monitor the flow of liquid inside the test section pipeline.

16. The method according to claim 15, characterized in that: The step S1 includes: The variable frequency pump (10) and the electric heater (8) are turned on, and the voltage stabilizer (5) is adjusted so that the pressure of the system is 7.5 MPa-8.5 MPa and the temperature is 250° C.-270° C.

17. The method according to claim 16, characterized in that: The step S1 further includes: The variable frequency pump (10) is adjusted, and the flow rate is observed by means of a flow meter (9) so that the flow rate of water in the system is 8 m / s-12 m / s.

18. The method according to claim 15, characterized in that: The step S2 includes: The eddy current generated inside the test section pipeline is monitored by moving a panoramic camera device along the flow direction of the liquid in the test section pipeline.

19. The method according to claim 18, characterized in that: The step S2 includes: First, the eddy current is identified by the panoramic camera device, and the distance between the panoramic camera device and the eddy current along the moving direction is measured. If the distance is greater than 0.2m, the moving speed of the panoramic camera device is increased. If the distance is less than or equal to 0.2m, the moving speed is maintained to monitor the eddy current.

20. The method according to claim 15, characterized in that: The step S2 includes: The tracking particles inside the test section pipeline are monitored by a particle velocimeter.

Images