Experimental device for testing flow instability of fluid

Abstract

The utility model relates to the technical field of ocean nuclear power application, in particular to an experimental device for testing fluid flow instability, which comprises a six-degree-of-freedom platform, a fluid circulation system and a first circulation pipeline, an upper header, a heat exchanger, a first circulating pump, a lower header and a plurality of experiment units connected in parallel are sequentially arranged on the first circulating pipeline in the fluid flowing direction; the cooling circulation system comprises a second circulation pipeline, and a second control valve, a first flow meter, a second circulation pump and the heat exchanger are sequentially arranged on the second circulation pipeline; the fluid circulation system and the cooling circulation system are both installed on the six-degree-of-freedom platform, and the first circulation pipeline exchanges heat with the second circulation pipeline through the heat exchanger. The experimental device provided by the utility model can accurately reflect the instability of the flowing of the metal fluid, and increases the accuracy of testing the instability of the flowing of the metal fluid.

Description

Technical Field

[0001] The utility model relates to the technical field of marine nuclear power application, in particular to an experimental device for testing fluid flow instability. Background Art

[0002] Marine nuclear power platforms are an organic combination of small nuclear reactors and ship engineering. They can provide safe and efficient energy supply for remote islands, and can be used in the fields of marine resource exploitation, high-power ships and seawater desalination. They are of great significance to China's development and utilization of new energy and marine resources. In the research and application of marine nuclear power, liquid metal as the coolant of the reactor has broad application prospects in marine engineering, especially lead-bismuth alloy as the coolant. Among them, the flow and heat transfer phenomenon of liquid metal in the reactor is the basis of reactor design and safety analysis. In the marine environment, the nuclear power platform will be affected by wind and waves, and will undergo six-degree-of-freedom motions such as heave, tilt, and sway. Under the influence of the additional force of the ocean, the nuclear power system will be subject to strong nonlinear disturbances, aggravating the uneven distribution of temperature and flow between parallel channels, destroying the natural circulation balance of the coolant in the loop, and then leading to flow instability, affecting the core heat transfer, and reducing the safety of the reactor. Therefore, conducting research on liquid metal flow instability under marine conditions is of great significance to the safe operation of marine nuclear power platforms. At present, there are relatively few experimental systems for studying the flow and heat transfer characteristics of liquid metal under marine conditions, especially in the study of liquid metal flow instability. No specific experimental equipment has been proposed for studying metal fluid instability in a simulated marine environment. Utility Model Content

[0003] The purpose of the utility model is to solve the technical problem of insufficient research on the flow instability of lead-bismuth alloy in the prior art, and provide the following technical solutions:

[0004] An experimental device for testing fluid flow instability, comprising:

[0005] A six-degree-of-freedom platform for simulating marine environments;

[0006] A fluid circulation system, comprising a first circulation pipeline, wherein the first circulation pipeline is a closed loop, and an upper header, a heat exchanger, a first circulation pump, a lower header, and a plurality of parallel experimental units are sequentially arranged along the fluid flow direction on the first circulation pipeline, wherein the experimental units are not less than two groups;

[0007] A cooling circulation system, comprising a second circulation pipeline, on which a second control valve, a first flow meter, a second circulation pump and the heat exchanger are sequentially arranged;

[0008] The fluid circulation system and the cooling circulation system are both installed on the six-degree-of-freedom platform, and the first circulation pipeline exchanges heat with the second circulation pipeline through the heat exchanger.

[0009] Each of the experimental units includes a third pipeline. Along the direction of fluid flow on the third pipeline, a first control valve, a second flowmeter, and a third control valve are sequentially arranged. The first control valve is connected to the lower header, and the third control valve is connected to the upper header; on the outer wall of the first circulation pipeline, a test section is also installed between the first control valve and the second flowmeter.

[0010] The test section includes several thermocouples and a power supply. The thermocouples are evenly distributed within the test section. The thermocouples are in contact with the outer wall of the first circulation pipeline, and the power supply is used to supply power to the test section.

[0011] Preferably, the number of the thermocouples is four.

[0012] The third pipeline includes a disassembly section, and the disassembly section is located in the test section area.

[0013] The cross-section of the disassembly section is arranged in any one of the forms of circular, petal-shaped, and rod bundle-shaped.

[0014] It further includes an argon branch system. The argon branch system is installed on the six-degree-of-freedom platform and is communicated with the upper header.

[0015] The argon branch system includes an argon gas tank. The argon gas tank is communicated with the upper header through a fourth pipeline, and a fourth control valve is arranged on the fourth pipeline.

[0016] It further includes a storage tank installed on the six-degree-of-freedom platform. The storage tank is communicated with the upper header through a fifth pipeline, and a fifth control valve is arranged on the fifth pipeline.

[0017] It further includes supporting power distribution equipment, a control panel, and a data panel. The six-degree-of-freedom platform, the fluid circulation system, the cooling circulation system, the argon branch system, and the fifth control valve are all connected to the corresponding power distribution equipment, control panel, and data panel.

[0018] The utility model has the following advantages:

[0019] (1) The utility model designs an experimental device applied to an ocean nuclear power platform to simulate the ocean environment and test the fluid flow instability. In this experimental device, by paralleling multiple experimental units and analyzing after testing the corresponding experimental parameters, it accurately reflects the instability of the metal fluid flow and improves the accuracy of the metal fluid flow instability test.

[0020] (2) When the liquid metal moves in the pipeline as a coolant, it can achieve natural circulation movement through the density difference, or it can be forced to circulate by adding a pump. By adding a first circulation pump in the present utility model, the entire experimental device can not only meet the measurement of the instability of fluid flow during natural circulation movement, but also meet the measurement of the instability of fluid flow during the study of forced circulation. At the same time, it can also explore the flow and heat transfer characteristics of lead-bismuth alloy during the transition from forced circulation to natural circulation and from natural circulation to forced circulation under moving conditions, realizing multi-faceted tests.

[0021] (3) On the third pipeline, in the area located at the test section, it is a detachable design. The detachable design enables the area of the third pipeline located at the test section to be a replaceable design. The pipeline in the disassembly section can be replaced with pipelines of different sizes and shapes to measure the differences in the flow and heat transfer characteristics of the metal fluid. Brief Description of the Drawings

[0022] Figure 1 It is a structural schematic diagram of the present utility model.

[0023] In the figure: 1. Test section, 2. Thermocouple, 3. Second flowmeter, 4. Third control valve, 5. Argon gas tank, 6. Storage tank, 7. Upper header, 8. Heat exchanger, 9. First circulation pump, 10. Lower header, 11. First control valve, 12. Six-degree-of-freedom platform, 13. Fluid circulation system, 14. Power supply, 15. Second control valve, 16. First flowmeter, 17. Second circulation pump, 18. Cooling circulation system, 19. First circulation pipeline, 20. Experimental unit, 21. Second circulation pipeline, 22. Third pipeline, 23. Fourth pipeline, 24. Fourth control valve, 25. Fifth pipeline, 26. Fifth control valve. Detailed Embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0025] Therefore, the following detailed description of the embodiments of the present utility model is not intended to limit the scope of the present utility model to be protected, but only represents a part of the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0026] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments can be combined with each other.

[0027] It should be noted that like reference numerals and letters denote like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0028] Refer to Figure 1 , an experimental device for testing fluid flow instability, comprising: a six-degree-of-freedom platform 12 for simulating a marine environment; a fluid circulation system 13, including a first circulation pipeline 19, the first circulation pipeline 19 being a closed loop, and an upper header 7, a heat exchanger 8, a first circulation pump 9, a lower header 10, and several parallel experimental units 20 being sequentially arranged on the first circulation pipeline 19 along the fluid flow direction, the number of the experimental units 20 being not less than two groups. In this embodiment, the test units are two groups. The metal fluid circulates in the fluid circulation system 13. In this embodiment, the metal fluid selected is a lead-bismuth alloy fluid.

[0029] A cooling circulation system 18, including a second circulation pipeline 21, on which a second control valve 15, a first flowmeter 16, a second circulation pump 17, and the heat exchanger 8 are sequentially arranged; the cooling circulation system 18 is used to dissipate heat and cool down the metal fluid in the first circulation pipeline 19.

[0030] Both the fluid circulation system 13 and the cooling circulation system 18 are installed on the six-degree-of-freedom platform 12, and the first circulation pipeline 19 exchanges heat with the second circulation pipeline 21 through the heat exchanger 8 to achieve the purpose of cooling the lead-bismuth alloy fluid in the first circulation pipeline. The cooling circulation system 18 generally selects a water-cooled circulation system. In this embodiment, the metal fluid in the first circulation pipeline 19 exchanges heat with the second circulation pipeline in the heat exchanger 8, and the heat after heat exchange is discharged into the air through the heat exchanger 8; in another embodiment, the cooling circulation system 18 can also install a secondary cooling device on the second circulation pipeline 21 to improve the heat exchange efficiency.

[0031] Each of the experimental units 20 includes a third pipeline 22. Along the fluid flow direction on the third pipeline 22, a first control valve 11, a second flowmeter 3, and a third control valve 4 are successively provided. The first control valve 11 is connected to the lower header 10, and the third control valve 4 is connected to the upper header 7. On the outer wall of the first circulation pipeline 19, a test section 1 is also installed between the first control valve 11 and the second flowmeter 3. The upper header 7 is used to converge the metal fluid of each third pipeline 22, and the lower header 10 is used to divert the metal fluid in the first circulation pipeline 19 into each third pipeline 22 according to the set requirements. Through the convergence and diversion completed by the upper header 7 and the lower header 10, the comparison of the flow rate and temperature of the test section 1 is realized.

[0032] The test section 1 includes several thermocouples evenly distributed and a power supply 14. The thermocouples 2 are in contact with the outer wall of the first circulation pipeline 19, and the power supply 14 is used to supply power to the test section 1. The thermocouples 2 are used to collect temperature. Preferably, the number of the thermocouples 2 is four. The thermocouples 2 evenly installed on the test section 1; the temperature parameters of the inlet and outlet of the channel where the metal fluid flows through the test section 1 are monitored by the topmost thermocouple 2 and the lowermost thermocouple 2; meanwhile, a flowmeter is configured at the outlet of the test section 1 to detect the flow rate parameters among the parallel third pipelines 22.

[0033] The third pipeline 22 includes a disassembly section, and the disassembly section is located in the area of the test section 1. The disassembly section can be disassembled and replaced according to the requirements. The cross-section of the disassembly section is set in any one of the forms of circular, petal-shaped, and rod bundle-shaped.

[0034] An experimental device for testing fluid flow instability provided by the present utility model further includes an argon branch system. The argon branch system is installed on the six-degree-of-freedom platform 12 and communicated with the upper header 7. The argon system makes the first circulation pipeline 19 in an argon environment to exclude the air of the easily oxidized metal.

[0035] The argon branch system includes an argon tank 5. The argon tank 5 is communicated with the upper header 7 through a fourth pipeline 23, and a fourth control valve 24 is provided on the fourth pipeline 23. The argon tank 5 stores argon.

[0036] It further includes a storage tank 6 installed on the six-degree-of-freedom platform 12. The storage tank 6 is communicated with the upper header 7 through a fifth pipeline 25, and a fifth control valve 26 is provided on the fifth pipeline 25.

[0037] It further includes supporting power distribution equipment, a control panel, and a data panel. The six-degree-of-freedom platform 12, the fluid circulation system 13, the cooling circulation system 18, the argon branch system, and the fifth control valve 26 are all connected to the corresponding power distribution equipment, control panel, and data panel.

[0038] The working principle of the present utility model is as follows:

[0039] Before the experiment starts, open the first control valve 11 and the third control valve 4, turn on the argon gas tank 5 and the fourth control valve 24, so that argon gas flows in the first circulation management. After the gas in the internal loop of the first circulation pipeline 19 is completely exhausted, close the fourth control valve 24 and the argon gas tank 5 in sequence. Open the fifth control valve 26 and the storage tank 6, and then selectively open the first circulation pump 9 according to the needs, so that the first circulation pipeline 19 is filled with liquid metal fluid. When the first circulation pipeline 19 is filled with liquid metal fluid, close the fifth control valve 26 and the storage tank 6 in sequence. Turn on the power supply 14 of the test section 1 to supply power to the test section 1. At this time, the test section 1 starts to heat the first circulation pipeline 19, and the thermocouple 2 also starts to work to detect the temperature of each area of the test section 1. Open the second control valve 15 and the second circulation pump 17 to start the cooling circulation system 18; after the fluid circulation system 13 and the cooling circulation system 18 are stable, turn on the six-degree-of-freedom platform 12, set the experimental target motion conditions, conduct ocean environment motion simulation, and record the experimental data of the test section 1. By recording and comparing data such as the values of each thermocouple and the flow rate of the second flowmeter 3, evaluate the instability of the metal fluid in the simulated ocean environment.

[0040] As mentioned above, the above is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. An experimental device for testing fluid flow instability, characterized in that: include: A six-degree-of-freedom platform for simulating marine environments; A fluid circulation system, comprising a first circulation pipeline, wherein the first circulation pipeline is a closed loop, and an upper header, a heat exchanger, a first circulation pump, a lower header, and a plurality of parallel experimental units are sequentially arranged along the fluid flow direction on the first circulation pipeline, wherein the experimental units are not less than two groups; A cooling circulation system, comprising a second circulation pipeline, on which a second control valve, a first flow meter, a second circulation pump and the heat exchanger are sequentially arranged; The fluid circulation system and the cooling circulation system are both installed on the six-degree-of-freedom platform, and the first circulation pipeline exchanges heat with the second circulation pipeline through the heat exchanger.

2. An experimental device for testing fluid flow instability according to claim 1, characterized in that: Each of the experimental units includes a third pipeline, on which a first control valve, a second flow meter and a third control valve are sequentially arranged along the direction of fluid flow, the first control valve is connected to a lower header, and the third control valve is connected to an upper header; a test section is also installed on the outer wall of the first circulation pipeline between the first control valve and the second flow meter.

3. An experimental device for testing fluid flow instability according to claim 2, characterized in that: The test section includes a plurality of thermocouples and a power supply. The thermocouples are evenly distributed in the test section. The thermocouples are in contact with the outer wall of the first circulation pipeline. The power supply is used to supply power to the test section.

4. The experimental device for testing fluid flow instability according to claim 3, characterized in that: The number of the thermocouples is four.

5. The experimental device for testing fluid flow instability according to claim 2, characterized in that: The third pipeline includes a disassembly section, and the disassembly section is located in the test section area.

6. The experimental device for testing fluid flow instability according to claim 5, characterized in that: The cross section of the disassembly section is arranged in any one of a circular shape, a petal shape and a rod bundle shape.

7. The experimental device for testing fluid flow instability according to claim 1, characterized in that: It also includes an argon gas branch system, which is installed on the six-degree-of-freedom platform and is connected to the upper header.

8. The experimental device for testing fluid flow instability according to claim 7, characterized in that: The argon gas branch system comprises an argon gas tank, which is connected to the upper header via a fourth pipeline, and a fourth control valve is provided on the fourth pipeline.

9. The experimental device for testing fluid flow instability according to claim 1, characterized in that: It also includes a storage tank installed on the six-degree-of-freedom platform, the storage tank is connected to the upper header through a fifth pipeline, and a fifth control valve is provided on the fifth pipeline.

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