An experimental device for verifying the hydraulic performance of the main pump of a compact reactor

Abstract

The present invention relates to a test device for verifying the hydraulic performance of a main pump of a compact reactor, which includes a first head simulation part and a second head simulation part. A first cavity is provided in the first head simulation part, and a second cavity is provided in the second head simulation part. A heat exchange tube simulation tube group is connected between the first cavity and the second cavity. A main pump installation cavity communicating with the first cavity is provided in the first head simulation part. The main pump installation cavity is communicated with a first resistance simulation cavity in a first ring cavity simulation part through a flow channel. The second cavity is communicated with a second resistance simulation cavity in a second ring cavity simulation part. The first resistance simulation cavity and the second resistance simulation cavity are connected to a water circulation mechanism. By using the device of the present invention, the engineering feasibility of the main pump scheme of the compact reactor can be confirmed, the design analysis and structure finalization of the integrated structure of the compact reactor can be guided, and the engineering feasibility of the main system flow measurement of the compact reactor can be confirmed.

Description

Technical Field

[0001] The present invention relates to the technical field of test equipment, and particularly relates to a test device for verifying the hydraulic performance of a main pump of a compact reactor. Background Art

[0002] The statements herein only provide background art related to the present invention and do not necessarily constitute prior art.

[0003] In large pressurized water reactor nuclear power plants, the inlets and outlets of the main pumps are usually connected to other main equipment through main pipelines or partial straight circular pipes. In order to be more compact and flexible, nuclear power small reactors usually adopt a compact design, that is, the main pipelines are cancelled, the pump casings of the main pumps are integrated with the SG (steam generator), and at the same time, the outlets of the main pumps are also closely connected to the RPV (pressure vessel). The SG water chamber head and the main pump casing are designed as an integral forging structure, and the hydraulic components of the main pump are directly inserted into the integral head structure. The nuclear main pump of this nuclear power compact small reactor is directly inverted and suspended at the lower end of the steam generator. The fluid of the steam generator is directly poured into the nuclear main pump without being rectified, which may cause the inlet flow distortion of the nuclear main pump, and this may affect the performance of the nuclear main pump. In the compact design, since the SG water chamber head and the main pump casing are integrated, the inlet flow field of the impeller may have strong unsteady characteristics, thus affecting the operation of the pump. The main potential impacts include: the inlet flow impact of the impeller blades causes the hydraulic efficiency of the impeller to decrease, the non-uniformity of the circumferential flow rate of the impeller causes the pump to be affected by flow-induced vibration during operation, and the flow field disturbance at the impeller inlet propagates to the inside of the impeller and volute, causing the rise of the internal pressure pulsation of the pump. On the one hand, these impacts may increase the energy consumption of the pump, and on the other hand, they pose a hazard to the safety and stability of the operation of the main pump, affecting the operability of the nuclear power system.

[0004] It is relatively common to study the influence of inlet flow distortion of conventional vane pumps on the performance of the pumps. Generally, the development of pump hydraulic models is also assumed to have a uniform and stable incoming flow in the design of general water pumps. There are also studies on the connection structure between the SG water chamber head and the inlet of the nuclear main pump. However, the inventor found that there are few relevant studies on how the integrated structure of the SG water chamber head and the main pump casing affects the performance of the nuclear main pump, and most of them are in the form of numerical simulation and simulation, and the credibility of the results has not been verified by experiments. Especially under complex flow conditions, the conventional numerical simulation turbulence model cannot ensure the true reflection of the real flow field dynamics characteristics inside the main pump and pipeline. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a test device for verifying the hydraulic performance of a main pump of a compact reactor, which can truly reflect the real flow field dynamics characteristics inside the main pump and pipeline of the compact reactor.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions

[0007] An embodiment of the present invention provides a test device for verifying the hydraulic performance of a main pump of a compact reactor, including a first head simulation part and a second head simulation part. A first cavity is provided in the first head simulation part, and a second cavity is provided in the second head simulation part. A heat exchange tube simulation tube group is connected between the first cavity and the second cavity. A main pump installation cavity communicating with the first cavity is provided in the first head simulation part. The main pump installation cavity is communicated with a first resistance simulation cavity in a first ring cavity simulation part through a flow channel. The second cavity is communicated with a second resistance simulation cavity in a second ring cavity simulation part. The first resistance simulation cavity and the second resistance simulation cavity are connected to a water circulation mechanism.

[0008] Optionally, the main pump installation cavity includes a pump head other component installation cavity and an impeller cavity provided inside the first head simulation part. The impeller cavity is communicated with the flow channel and the first cavity.

[0009] Optionally, a pressure detection element and a pressure pulsation detection element are installed at the intersection position between the first cavity and the impeller cavity, and pressure detection elements and pressure pulsation detection elements are arranged inside the flow channel.

[0010] Optionally, the flow channel adopts a venturi tube structure, with one end connected to the main pump installation cavity and the other end connected to the first resistance simulation flow channel.

[0011] Optionally, a differential pressure detection element is arranged at the necking part of the flow channel.

[0012] Optionally, pressure detection elements are installed inside both the first cavity and the second cavity.

[0013] Optionally, the first resistance simulation cavity adopts a semi-circular ring-shaped cavity, and the inner arc side is arranged away from the first head simulation part. The second resistance simulation flow channel adopts a cavity with a semi-circular cross-section, and its arc surface is arranged close to the second head simulation part.

[0014] Optionally, a third ring cavity simulation part is provided below the first ring cavity simulation part, and a fourth ring cavity simulation part is provided below the second ring cavity simulation part. The third ring cavity simulation part is provided with a first transition cavity communicating with the first resistance simulation cavity, and the fourth ring cavity simulation part is provided with a second transition cavity communicating with the second resistance simulation cavity. The first transition cavity and the second transition cavity are connected to the water circulation mechanism.

[0015] Optionally, the heat exchange tube simulation tube group includes a plurality of U-shaped tubes. One end of the U-shaped tube is fixed to the first head simulation part through a tube sheet and communicated with the first cavity, and the other end of the U-shaped tube is fixed to the second head simulation part through a tube sheet and communicated with the second cavity.

[0016] Optionally, the inner cavity surfaces of both the first cavity and the second cavity adopt a quarter spherical surface, and the inner cavity surfaces of the first cavity and the second cavity can be combined into a hemispherical surface.

[0017] Optionally, the water circulation mechanism includes a water tank. The outlet of the water tank is connected to the second resistance simulation cavity through a pipeline, and the inlet of the water tank is connected to the first resistance simulation cavity through a pipeline.

[0018] Advantages of the present invention:

[0019] 1. The test device of the present invention is provided with a first head simulation part having a first cavity, a second head simulation part having a second cavity, and a heat exchange tube simulation tube group. A main pump installation cavity communicating with the flow channel and the first cavity is provided in the first head simulation part. The main pump installation cavity can install the main pump hydraulic component test piece, so that the whole test device simulates a compact reactor. When the main pump hydraulic component test piece works, it can drive water to circulate in the water circulation mechanism, and uses the first resistance simulation cavity and the second resistance simulation cavity to simulate the resistance of the pressure vessel inlet ring cavity and the core outlet upper chamber, so as to obtain the pressure distribution and the flow field dynamic characteristics upstream and downstream of the main pump, realize a reasonable simulation of the hydraulic characteristics of the integrated structure of the water chamber head and the main pump casing of the compact small reactor, so as to reveal the influence of the flow field characteristics of the integrated structure on the main pump, the influence of the main pump on the SG primary side and the flow field of the integrated structure, confirm the engineering feasibility of the main pump scheme of the compact small reactor, master the flow field design law of the integrated structure, guide the design analysis and structure finalization of the integrated structure of the compact small reactor, and confirm the engineering feasibility of the flow measurement of the main system of the compact small reactor.

[0020] 2. The test device of the present invention simulates the resistance characteristics of the pressure vessel RPV flow channel through the first resistance simulation cavity and the second resistance simulation cavity. The adopted structure is simple, simplifies the structure of the test device, and reduces the manufacturing cost of the test device. Description of the Drawings

[0021] The specification drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation to this application.

[0022] Figure 1 Schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0023] Among them, 1. First head simulation part, 2. Second head simulation part, 3. First cavity, 4. Second cavity, 5. Heat exchange tube simulation tube group, 6. First tube sheet, 7. Second tube sheet, 8. Anti-seismic strip, 9. Support plate, 10. Steel structure base, 11. Spacer, 12. Impeller cavity, 13. Installation cavity for other parts of the pump head, 14. Flow channel, 15. First ring cavity simulation part, 16. First resistance simulation cavity, 17. Third ring cavity simulation part, 18. First transition cavity, 19. Transition channel, 20. Second ring cavity simulation part, 21. Second resistance simulation cavity, 22. Fourth ring cavity simulation part, 23. Second transition cavity, 24. Water tank, 25. Filter, 26. Auxiliary booster pump, 27. Pressure stabilizing tank, 28. Flowmeter, 29. Control valve, 30. Plate heat exchanger, 31. Driving device. Detailed implementation method

[0024] Embodiment 1

[0025] This embodiment provides a test device for verifying the hydraulic performance of a compact reactor main pump, as Figure 1 shown, including a first head simulation part 1 and a second head simulation part 2. The first head simulation part 1 has a first cavity 3 inside, and the second head simulation part 2 has a second cavity 4 inside.

[0026] The cavity surfaces of the first cavity 3 and the second cavity 4 are both quarter spheres, and the first cavity 3 and the second cavity 4 can form a hemispherical structure. Therefore, the first cavity 3 and the second cavity 4 are formed by cutting a hemisphere and moving it to both sides.

[0027] The top of the first cavity 3 extends to the top surface of the first head simulation part 1, and the top of the second cavity 4 extends to the top surface of the second head simulation part 2.

[0028] A pressure detection element is installed in the first cavity 3 through a pressure taking hole provided in the first head simulation part 1 to detect the fluid pressure in the first cavity. A pressure detection element is installed in the second cavity 4 through a pressure taking hole provided in the second head simulation part 2 to detect the fluid pressure in the second cavity. In this embodiment, an existing pressure sensor can be used as the pressure detection element. The pressure sensor is connected to the control system and can transmit the collected data to the control system. Through the pressure sensors in the first cavity and the second cavity, the pressure parameters of the cooling water in the head can be detected.

[0029] A heat exchange tube simulation tube group 5 is arranged between the first cavity 3 and the second cavity 4. The heat exchange tube simulation tube group 5 connects the first cavity 3 and the second cavity 4 and is used to simulate the SG heat exchange tubes upstream of the compact reactor main pump.

[0030] In this embodiment, the heat exchange tube simulation tube group 5 includes a plurality of U-shaped tubes, which are distributed in a parallel array. One end of the U-shaped tube is fixed to the first tube sheet 6. The first tube sheet 6 is fixed to the upper surface of the first head simulation part 1 by a plurality of bolts, and a sealing ring is provided between the first tube sheet 6 and the first head simulation part 1. The first tube sheet 6 is provided with through holes corresponding to the U-shaped tubes, so that the U-shaped tubes are communicated with the internal space of the first cavity 3.

[0031] The other end of the U-shaped tube is fixed to the second tube sheet 7. The second tube sheet 7 is fixed to the upper surface of the second head simulation part 2 by a plurality of bolts, and a sealing ring is provided between the second tube sheet 7 and the second head simulation part 2. The second tube sheet 7 is provided with through holes corresponding to the U-shaped tubes, so that the U-shaped tubes are communicated with the internal space of the second cavity 4.

[0032] In order to prevent the U-shaped tube row from vibrating during the test, multiple V-shaped anti-vibration bars 8 are inserted between the arranged U-shaped tubes. The anti-vibration bar groups 8 are hung on the U-shaped tubes and made of stainless steel bars to prevent the U-shaped tube row from vibrating under the hydraulic action.

[0033] In this embodiment, a support plate 9 also passes through the end of the U-shaped tube. The support plate 9 is fixed to the external frame and is used to support the U-shaped tube. The two ends of the U-shaped tube are respectively communicated with the first cavity and the second cavity after passing through the support plate.

[0034] The U-shaped tubes are made of stainless steel tubes. Pressure difference sensors are installed at intervals on the U-shaped tubes to measure the pressure difference and measure the flow resistance characteristics of the U-shaped tubes.

[0035] In this embodiment, the first head simulation part 1 and the second head simulation part 2 are arranged on the steel structure base 10 and supported by the steel structure base 10.

[0036] A main pump installation cavity is arranged in the first head simulation part 1. The main pump installation cavity is arranged below the first cavity 3 and communicated with the first cavity 3. The main pump installation cavity is used to install the main pump, thus realizing the simulation of a compact reactor with an integrated structure of the main pump pump shell and the water chamber head.

[0037] The first cavity and the second cavity are at the same height. Since the main pump installation cavity is located below the first cavity 3, the dimension of the first head simulation part 1 in the vertical direction is higher than that of the second head simulation part 2 in the vertical direction. In order to make the top surfaces of the first head simulation part 1 and the second head simulation part 2 flush, a cushion block 11 is provided between the second head simulation part 2 and the steel structure base. The thickness of the cushion block 11 makes the top surface of the second head simulation part 2 flush with the top surface of the first head simulation part 1.

[0038] The main pump installation cavity includes an impeller cavity 12 and an installation cavity 13 for other components of the pump head, which are arranged in sequence from top to bottom. The impeller cavity 12 is used to place the draft tube, impeller, and guide vane of the main pump, and the installation cavity 13 for other components of the pump head is used to install the (partial) shaft and mechanical seal of the main pump. Correspondingly, an opening for the pump head to extend into the installation cavity for other parts of the pump head is provided on the steel structure base 10.

[0039] A flow channel part is provided on the side of the first head simulation part 1 close to the second head simulation part 2. The flow channel part is located in the space between the first head simulation part 1 and the second head simulation part 2. A flow channel 14 is arranged in the flow channel part. One end of the flow channel 14 is communicated with the impeller cavity 12, and the other end extends into the first ring cavity simulation part 15 and is communicated with the first resistance simulation cavity 16. In this embodiment, a cushion block 11 is provided between the flow channel part and the steel structure base 10, and the flow channel part is supported by the cushion block 11.

[0040] Along the water flow direction, the flow channel 14 adopts a Venturi tube structure, and the feasibility study of the primary loop flow rate test can be carried out.

[0041] A first ring cavity simulation part 15 is arranged on one side of the flow channel part. The first ring cavity simulation part 15 is in sealing fit with the side surfaces of the flow channel part and the cushion block 11. A first resistance simulation cavity 16 is arranged in the first ring cavity simulation part 15, which is used to apply a certain resistance to the circulating water to simulate the resistance characteristics of the flow channel of the inlet ring cavity of the pressure vessel RPV.

[0042] In this embodiment, the first resistance simulation cavity 16 adopts a cavity with a horizontal cross-section in the shape of a semi-circular ring, and its outer arc surface is close to the first head simulation part 1. The flow channel 14 extends into the first ring cavity simulation part 15 and is communicated with the first resistance simulation cavity 16.

[0043] A third ring cavity simulation part 17 is arranged below the first ring cavity simulation part 15. The third ring cavity simulation part 17 is in sealing fit with the first ring cavity simulation part 15. A first transition cavity 18 with a horizontal cross-section in the shape of a semi-circle is opened on the upper surface of the third ring cavity simulation part 17. The shape of the first transition cavity 18 corresponds to the shape of the first resistance simulation cavity 16, and the first transition cavity 18 is communicated with the first resistance simulation cavity 16. A transition channel 19 is opened on the horizontal cavity surface of the first transition cavity 18, and the transition channel extends to the bottom surface of the third ring cavity simulation part.

[0044] A second ring cavity simulation part 20 is arranged on one side of the second head simulation part 2. The second ring cavity simulation part 20 is in sealing fit with the second head simulation part 2 and the cushion block 11 below it. A second resistance simulation cavity 21 is arranged inside the second ring cavity simulation part 20, which is used to simulate the resistance characteristics of the flow channel of the upper chamber at the outlet of the pressure vessel RPV core.

[0045] The second resistance simulation cavity 21 adopts a cavity with a semi-circular horizontal cross-section, and the second resistance simulation cavity 21 is communicated with the second cavity 4 through an intermediate channel.

[0046] A fourth ring cavity simulation member 22 is arranged below the second ring cavity simulation member 20. The second ring cavity simulation member 20 is hermetically attached to the fourth ring cavity simulation member 22. A second transition cavity 23 with a semi-circular horizontal cross-section is opened on the upper surface of the fourth ring cavity simulation member 22. The second transition cavity 23 is communicated with the second resistance simulation cavity 21. A transition channel 19 is arranged on the horizontal cavity surface of the second transition cavity 23, and the transition channel 19 extends to the bottom surface of the fourth ring cavity simulation member 22.

[0047] In this embodiment, through the settings of the first resistance simulation cavity 16 and the second resistance simulation cavity 21, the flow channel resistance characteristics of the inlet ring cavity of the pressure vessel and the upper chamber of the core outlet are simulated with the simplest structure, without the need to set up a water flow channel identical to that of the pressure vessel, simplifying the test device and facilitating processing and production.

[0048] The two transition channels 19 are connected to the water circulation mechanism through through-holes opened in the steel structure base 10, thereby realizing the reciprocating circulation of the cooling water among the second transition cavity 23, the second resistance simulation cavity 21, the second cavity 4, the heat exchange tube simulation tube group 5, the first cavity 3, the impeller cavity 12, the flow channel 14, the first resistance simulation cavity 16, and the first transition cavity 18.

[0049] In this embodiment, a pressure detection element and a pressure pulsation detection element are installed at the intersection position between the first cavity 3 and the impeller cavity 12. A plurality of pressure detection elements and pressure pulsation detection elements are provided, and they are arranged circumferentially along the edge of the intersection. The pressure detection element uses a pressure sensor, and the pressure pulsation detection element uses a pressure pulsation sensor, which are respectively used to detect the pressure parameters and pressure pulsation parameters at the inlet of the main pump.

[0050] The part of the flow channel 14 located in the first ring cavity simulation member 15 has a semi-circular cross-section. A plurality of pressure detection elements and pressure pulsation detection elements are installed along the circumference inside this part. The pressure detection element uses a pressure sensor, and the pressure pulsation detection element uses a pressure pulsation sensor, which are used to detect the cooling water pressure and pressure pulsation data at the outlet of the main pump.

[0051] A differential pressure detection element is also installed at the necking part in the middle of the flow channel. The differential pressure detection element uses a differential pressure sensor, which can study the feasibility of measuring the flow rate of the primary loop using differential pressure.

[0052] In this embodiment, the first head simulation part 1 and the second head simulation part 2 are machined according to the scaled-down size of a compact reactor and are made of transparent acrylic material. The first head simulation part 1 and the second head simulation part 2 are separately arranged, and their opposite planes can serve as PIV lighting planes. A PIV device can be installed between the first head simulation part 1 and the second head simulation part 2 to meet the requirements of PIV flow field dynamic testing.

[0053] The water circulation mechanism includes a water tank 24 and corresponding pipelines. The outlet of the water tank 24 is connected to the transition channel 19 of the fourth annular cavity simulation part 22 through a pipeline. Along the water flow direction on the pipeline between the outlet of the water tank 24 and the transition channel 19 of the fourth annular cavity simulation part 22, a filter 25, an auxiliary booster pump 26, a pressure stabilizing tank 27, a flowmeter 28, and a regulating valve 29 are arranged in sequence. Pressure sensors are provided on both sides of the filter 25, and a pressure sensor is provided downstream of the auxiliary booster pump 26. A water temperature sensor is provided between the pressure stabilizing tank 27 and the regulating valve 29, and a pressure sensor is provided between the regulating valve 29 and the transition channel.

[0054] The inlet of the water tank 24 is connected to the transition channel 19 of the third annular cavity simulation part 17 through a pipeline. Along the water flow direction, a regulating valve 29 and a plate heat exchanger 30 are arranged in sequence on the pipeline. Pressure sensors and water temperature sensors are installed on the pipeline between the regulating valve 29 and the transition channel, and water temperature sensors are provided on both sides of the plate heat exchanger 30.

[0055] The flowmeter 28, pressure sensors, and water temperature sensors on the pipeline are connected to the control system, which are respectively used to monitor the flow rate, temperature, and pressure of the test loop and transmit the data to the control system.

[0056] The working method of this embodiment is as follows:

[0057] First, a main pump hydraulic component test piece is fabricated according to the structure of the main pump of a compact reactor according to a set scale ratio. The main pump hydraulic component test piece is a wet-winding main pump hydraulic component test piece or a canned motor main pump hydraulic component test piece, and a driving device 31 is provided in a supporting manner. The entire main pump test piece unit is composed of components such as a draft tube, an impeller, a diffuser, a mechanical seal, a pump cover, a bearing chamber, a coupling, and a motor. Among them, the mechanical seal and the shaft (part) are installed in the other component installation cavity 13 of the pump head, and the draft tube, impeller, and diffuser are located in the impeller cavity 12. The pump cover is bolted to the first head simulation part 1.

[0058] After the main pump hydraulic component test piece is installed in the main pump installation cavity, water is injected into the water tank so that the water fills the entire circulation loop.

[0059] Start the driving device of the test piece of the main pump's hydraulic components. The impeller rotates, driving water to flow out of the water tank 24, successively passing through the pressure stabilizing tank 27, the regulating valve 29, the second resistance simulation chamber 21, the second cavity 4, the heat exchange tube simulation tube bank 5, the first cavity 3, the impeller chamber 12, the flow channel 14, the first resistance simulation chamber 16, and the plate heat exchanger 30, and then flowing back to the water tank 24, realizing the circulating flow of water. By reading the data measured by each instrument, the parameters related to the performance of the main pump and the integrated structure can be obtained. Furthermore, the influence of the flow field characteristics of the integrated structure of the main pump casing and the head on the main pump can be obtained, as well as the influence of the main pump on the primary side of the SG and the flow field of the integrated structure, so as to confirm the engineering feasibility of the compact reactor main pump scheme and guide the design analysis and structure finalization of the compact reactor integrated structure.

[0060] Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation on the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. An experimental device for verifying the hydraulic performance of the main pump of a compact reactor, characterized in that, It includes a first head simulation part and a second head simulation part. A first cavity is provided inside the first head simulation part, and a second cavity is provided inside the second head simulation part. A heat exchange tube simulation tube group is connected between the first cavity and the second cavity. A main pump installation cavity communicating with the first cavity is provided inside the first head simulation part. The main pump installation cavity is connected to a first resistance simulation cavity inside the first annular cavity simulation part through a flow channel. The second cavity is connected to a second resistance simulation cavity inside the second annular cavity simulation part. The first resistance simulation cavity and the second resistance simulation cavity are connected to a water circulation mechanism; Pressure detection elements are installed inside both the first cavity and the second cavity.

2. The experimental device for verifying the hydraulic performance of the main pump of a compact reactor according to claim 1, characterized in that, The main pump installation cavity includes a pump head other components installation cavity and an impeller cavity provided inside the first head simulation part. The impeller cavity is connected to the flow channel and the first cavity.

3. The experimental device for verifying the hydraulic performance of the main pump of a compact reactor according to claim 2, characterized in that, Pressure detection elements and pressure pulsation detection elements are installed at the intersection position between the first cavity and the impeller cavity. Pressure detection elements and pressure pulsation detection elements are provided inside the flow channel.

4. The experimental device for verifying the hydraulic performance of the main pump of a compact reactor according to claim 1, characterized in that, The flow channel adopts a Venturi tube structure, with one end connected to the main pump installation cavity and the other end connected to the first resistance simulation flow channel; Furthermore, a differential pressure detection element is provided at the constricted part of the flow channel.

5. The experimental device for verifying the hydraulic performance of the main pump of a compact reactor according to claim 1, characterized in that, The first resistance simulation cavity adopts a semi-circular ring-shaped cavity, and the inner arc side is arranged away from the first head simulation part. The second resistance simulation flow channel adopts a cavity with a semi-circular cross-section, and its arc surface is arranged close to the second head simulation part.

6. The experimental device for verifying the hydraulic performance of the main pump of a compact reactor according to claim 1, characterized in that, A third annular cavity simulation part is provided below the first annular cavity simulation part, and a fourth annular cavity simulation part is provided below the second annular cavity simulation part. The third annular cavity simulation part is provided with a first transition cavity communicating with the first resistance simulation cavity, and the fourth annular cavity simulation part is provided with a second transition cavity communicating with the second resistance simulation cavity. The first transition cavity and the second transition cavity are connected to the water circulation mechanism.

7. The experimental device for verifying the hydraulic performance of the main pump of a compact reactor according to claim 1, characterized in that, The heat exchange tube simulation tube group includes a plurality of U-shaped tubes. One end of the U-shaped tube is fixed to the first head simulation part through a tube sheet and is connected to the first cavity, and the other end of the U-shaped tube is fixed to the second head simulation part through a tube sheet and is connected to the second cavity.

8. The experimental device for verifying the hydraulic performance of the main pump of a compact reactor according to claim 1, characterized in that, The inner cavity surfaces of both the first cavity and the second cavity adopt a quarter spherical surface, and the inner cavity surfaces of the first cavity and the second cavity can be combined into a hemispherical surface.

9. The experimental device for verifying the hydraulic performance of the main pump of a compact reactor according to claim 1, characterized in that, The water circulation mechanism includes a water tank. The outlet of the water tank is connected to the second resistance simulation cavity through a pipeline, and the inlet of the water tank is connected to the first resistance simulation cavity through a pipeline.

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