Liquid lead-bismuth alloy flow resistance experimental device and experimental method

Abstract

This application proposes an experimental apparatus for the flow resistance of liquid lead-bismuth alloy, comprising a storage container and an experimental chamber connected by pipelines. A first pipeline connects the storage container to the experimental chamber, and a second pipeline connects the experimental chamber to the storage container. A first flow meter is installed on the first pipeline. The experimental chamber includes an outer shell with a flow channel inside. A removable support core is installed on the flow channel, and several detachable and replaceable experimental devices are installed on the support core. The experimental devices are located within the flow channel. A first pressure gauge is installed at the inlet end of the flow channel, and a second pressure gauge is installed at the outlet end of the flow channel. This application also proposes an experimental method based on the above-mentioned experimental apparatus for the flow resistance of liquid lead-bismuth alloy. The experimental apparatus and method proposed in this application can simulate the internal structure of rod bundle channels and heat transfer tube channels by disassembling and replacing the experimental devices inside the experimental chamber, thereby completing the measurement and study of the flow resistance characteristics of liquid lead-bismuth alloy facing different structures.

Description

Technical Field

[0001] This application relates to the field of experimental technology for liquid metals in advanced nuclear reactors, specifically to an experimental apparatus and method for testing the flow resistance of liquid lead-bismuth alloy. Background Technology

[0002] In nuclear reactors, lead-cooled fast reactors use lead-bismuth alloys as the primary coolant. Lead-bismuth alloys possess stable chemical properties, high boiling points, and high thermal conductivity, offering advantages such as good heat transfer performance and high energy density. However, the physical properties of lead-bismuth alloys differ significantly from those of water, and existing mature design and operating experience with pressurized water reactors cannot be directly applied to lead-cooled fast reactors. The flow resistance characteristics of lead-bismuth alloys directly affect the design of the main pump head and also influence the flow field distribution and heat transfer process in the reactor's primary loop. Therefore, it is necessary to first conduct a detailed study of the flow resistance characteristics of lead-bismuth alloys.

[0003] Current experimental setups for the flow and heat transfer characteristics of lead-bismuth alloys primarily focus on system loop construction, with most designs targeting rod bundle assemblies. In actual reactors, lead-bismuth alloys not only flow through rod bundle assemblies in the primary loop but also traverse heat transfer tubes, indirectly transferring heat with the secondary loop working fluid. The rod bundles and heat transfer tubes differ significantly in structure and arrangement, resulting in varying flow resistance characteristics of lead-bismuth alloys across different locations within the reactor. Therefore, studies on the flow resistance characteristics of lead-bismuth media need to be conducted separately for different structures. However, existing experimental setups cannot yet complete the measurement and study of the flow resistance characteristics of lead-bismuth alloys under multiple structural parameters and various structural conditions within the same experimental loop.

[0004] Therefore, it is necessary to develop a new experimental device for the flow resistance of liquid lead-bismuth alloy. Summary of the Invention

[0005] To address the problems existing in the prior art, this application provides an experimental apparatus for the flow resistance of liquid lead-bismuth alloy. This apparatus can measure and analyze the flow resistance characteristics of liquid lead-bismuth alloy under different structures by changing the experimental components.

[0006] The technical solution adopted by this application to solve its technical problem is as follows: Constructing a liquid lead-bismuth alloy flow resistance experimental device, including a liquid storage container and an experimental chamber connected by a pipeline, wherein the liquid storage container is used to store liquid lead-bismuth alloy, a delivery pump is provided on the pipeline, and the liquid lead-bismuth alloy circulates between the liquid storage container and the experimental chamber through the delivery pump, the pipeline between the outlet end of the liquid storage container and the inlet end of the experimental chamber is a first pipeline, the pipeline between the outlet end of the experimental chamber and the inlet end of the liquid storage container is a second pipeline, and a first flow meter is provided on the first pipeline;

[0007] The experimental chamber includes an outer shell with a through-flow channel inside for liquid lead-bismuth alloy to flow through. A removable support core is provided on the flow channel, and several detachable and replaceable experimental devices are provided on the support core. The experimental devices are located inside the flow channel. A first pressure gauge is provided at the inlet end of the flow channel, and a second pressure gauge is provided at the outlet end of the flow channel.

[0008] In some embodiments, two experimental boxes are provided, including a first experimental box and a second experimental box. Each experimental box includes a first branch and a second branch. The first experimental box is disposed on the first branch, and the second experimental box is disposed on the second branch. The first branch and the second branch are connected in parallel.

[0009] In some embodiments, a second flow meter and a fifth control valve are provided on the first branch, and the second flow meter and the fifth control valve are located between the outlet end of the liquid storage container and the inlet end of the first experimental chamber.

[0010] A third flow meter and a sixth control valve are installed on the second branch, and the third flow meter and the sixth control valve are located between the outlet end of the liquid storage container and the inlet end of the second experimental chamber.

[0011] In some embodiments, the first pipeline is provided with a heater for heating the liquid lead-bismuth alloy;

[0012] A heat exchanger is installed on the second pipeline, which is used to regulate the temperature of the liquid lead-bismuth alloy after the experiment is completed.

[0013] In some embodiments, a third pipeline is connected in parallel to the heater, a second control valve is provided on the third pipeline, and a third control valve is provided between the liquid storage container (100) and the heater (400).

[0014] In some embodiments, a temperature sensor is provided in the flow channel, and the temperature sensor is connected to a temperature meter.

[0015] In some embodiments, an oxygen control box is provided on the second pipeline.

[0016] In some embodiments, a filling and venting circuit is provided between the oxygen control box and the liquid storage container. The filling and venting circuit includes a gas cylinder connected between the oxygen control box and the liquid storage container. A tenth control valve is provided at the outlet end of the gas cylinder. An eighth control valve is provided between the gas cylinder and the oxygen control box. A ninth control valve is provided between the gas cylinder and the liquid storage container.

[0017] Furthermore, this application also discloses an experimental method based on the above-mentioned experimental apparatus for testing the flow resistance of liquid lead-bismuth alloy, including the following steps:

[0018] S1. Remove the inner support core from the outer shell, replace it with the experimental device to be tested, and after replacement, put the inner support core back into the outer shell and fix it in place.

[0019] S2. Turn on the delivery pump to allow the liquid lead-bismuth alloy in the storage container to flow through the experimental chamber;

[0020] S3. Measure the total flow rate Q of the liquid lead-bismuth alloy using the first flow meter. in The pressure P of the liquid lead-bismuth alloy before entering the experimental chamber was measured using the first pressure gauge. in The pressure P of the liquid lead-bismuth alloy flowing out of the experimental chamber was measured using a second pressure gauge. out ;

[0021] S4. Based on the measurement results in step S3, the pressure drop ΔP after the liquid lead-bismuth alloy flows through the experimental chamber is obtained as ΔP = P in -P out , by △P and Q in Calculate and analyze the flow resistance of liquid lead-bismuth alloy;

[0022] S5. Turn off the delivery pump and end the experiment.

[0023] In some embodiments, in step S5 above, after the delivery pump is turned off, the eighth control valve and the tenth control valve are opened. The high-pressure gas sent from the gas cylinder passes through the second pipeline, the experimental chamber and the first pipeline in sequence, and then reaches the liquid storage container, cleaning the remaining liquid lead-bismuth alloy in the second pipeline, the experimental chamber and the first pipeline back into the liquid storage container.

[0024] Implementing this application has at least the following beneficial effects: This application proposes an experimental device and method for the flow resistance of liquid lead-bismuth alloy. By disassembling and replacing the experimental devices inside the experimental chamber, the internal structure of the rod bundle channel and heat transfer tube channel can be simulated, and the flow resistance characteristics of liquid lead-bismuth alloy under different structures can be measured and studied. At the same time, this application can also adjust the number of experimental devices by disassembling, and has the function of completing the study of flow resistance characteristics under various structural parameters, thus reducing experimental and labor costs. Attached Figure Description

[0025] The present application will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the experimental apparatus for the flow resistance of liquid lead-bismuth alloy provided in this application;

[0027] Figure 2 yes Figure 1A three-dimensional structural diagram of the experimental chamber;

[0028] Figure 3 yes Figure 2 A schematic diagram of the internal structure of the experimental chamber.

[0029] Explanation of icon numbers:

[0030] First pipeline 10, second pipeline 20, third pipeline 30, fourth pipeline 40, charging and venting circuit 50;

[0031] Storage container 100, first flow meter 200, transfer pump 300, heater 400, experimental chamber 500, second flow meter 501, second flow meter 502, temperature meter 503, heat exchanger 600, oxygen control box 700, gas cylinder 800.

[0032] First control valve V1, second control valve V2, third control valve V3, fourth control valve V4, fifth control valve V5, sixth control valve V6, seventh control valve V7, eighth control valve V8, ninth control valve V9, tenth control valve V10;

[0033] The outer casing 510, the flow channel 511, the supporting inner core 520, the mounting groove 521, the experimental device 530, and the flange 540. Detailed Implementation

[0034] To provide a clearer understanding of the technical features, objectives, and effects of this application, the specific embodiments of this application are now described in detail with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] In the description of this application, it should be understood that the terms "longitudinal", "lateral", "up", "down", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] To address the problems in the study of the flow resistance characteristics of liquid lead-bismuth alloys, Chinese invention patent CN202310279703.1 provides an experimental device for the flow heat transfer of liquid lead-bismuth across a rod bundle. This patent divides the experimental device into a flow region module and a power loading module. By measuring parameters such as wall temperature, pressure, and flow rate of the flow region module, the flow heat transfer characteristics of the liquid lead-bismuth medium across the rod bundle are obtained. However, the experimental section of this device is connected by welding, which makes it impossible to change or adjust the structural parameters of the experimental section, and it lacks the ability to study the thermal-hydraulic characteristics of lead-bismuth alloys near the heat transfer tubes. In addition, Chinese invention patent CN202310563128.8 provides an experimental device and method for the flow heat transfer of lead-bismuth alloys in a rectangular narrow channel. This patent designs a narrow rectangular channel experimental device for studying the flow heat transfer characteristics of lead-bismuth alloys in a narrow rectangular channel, but it still cannot complete the measurement and analysis of the flow resistance characteristics of liquid lead-bismuth alloys under different structures. Therefore, this application specifically provides an experimental apparatus for the flow resistance of liquid lead-bismuth alloy, which can measure and analyze the flow resistance characteristics of liquid lead-bismuth alloy under different structures by changing the experimental device 530.

[0040] Reference Figures 1 to 3 This application provides some specific embodiments of the experimental apparatus for testing the flow resistance of liquid lead-bismuth alloy.

[0041] like Figure 1 As shown, this application provides an experimental apparatus for the flow resistance of liquid lead-bismuth alloy, including a storage container 100 and an experimental chamber 500 connected by pipelines. The storage container 100 is used to store liquid lead-bismuth alloy, and a first control valve V1 is provided at the outlet end of the storage container 100. A transfer pump 300 is provided on the pipeline, and the liquid lead-bismuth alloy circulates between the storage container 100 and the experimental chamber 500 through the transfer pump 300. The pipeline between the outlet end of the storage container 100 and the inlet end of the experimental chamber 500 is a first pipeline 10, and the pipeline between the outlet end of the experimental chamber 500 and the inlet end of the storage container 100 is a second pipeline 20. A first flow meter 200 is provided on the first pipeline 10, and the first flow meter 200 is used to measure the total flow rate of the liquid lead-bismuth alloy.

[0042] like Figure 1 As shown, in some embodiments, a heater 400 for heating the liquid lead-bismuth alloy is also provided on the first pipeline 10. The liquid lead-bismuth alloy is heated by the heater 400 to measure the flow resistance characteristics of the liquid lead-bismuth alloy at different temperatures. Furthermore, to make the use of the heater 400 more flexible, a third pipeline 30 can be connected in parallel to the heater 400. A second control valve V2 is provided on the third pipeline 30, a third control valve V3 is provided between the liquid storage container 100 and the heater 400, and a fourth control valve V4 is provided between the heater 400 and the experimental chamber 500. When heating is not required, the second control valve V2 is opened, while the third control valve V3 and the fourth control valve V4 are closed, allowing the liquid lead-bismuth alloy to flow through the third pipeline 30. When heating is required using the heater 400, the second control valve V2 is closed, while the third control valve V3 and the fourth control valve V4 are opened, allowing the liquid lead-bismuth alloy to flow through the heater 400, which heats the liquid lead-bismuth alloy.

[0043] like Figure 1As shown, in some embodiments, two experimental chambers 500 are provided, including a first experimental chamber and a second experimental chamber. The first experimental chamber is located on a first branch, and the second experimental chamber is located on a second branch, with the first and second branches connected in parallel. The first branch is equipped with a second flow meter 501 and a fifth control valve V5, located between the outlet of the liquid storage container 100 and the inlet of the first experimental chamber. The second branch is equipped with a third flow meter 502 and a sixth control valve V6, also located between the outlet of the liquid storage container 100 and the inlet of the second experimental chamber. By providing two or more experimental chambers 500, different group experiments can be conducted, and multiple experimental chambers 500 can continue experiments simultaneously, improving experimental efficiency. For example, when the fifth control valve V5 is opened, the first experimental chamber is connected between the first pipeline 10 and the second pipeline 20, and the liquid lead-bismuth alloy flows sequentially through the second flow meter 501 and the first experimental chamber. When the sixth control valve V6 is opened, the second experimental chamber is connected between the first pipeline 10 and the second pipeline 20, and the liquid lead-bismuth alloy flows sequentially through the third flow meter 502 and the second experimental chamber. By adjusting the opening of the fifth control valve V5 and the sixth control valve V6, the flow rate of the liquid lead-bismuth alloy flowing through the first and second experimental chambers can be controlled respectively. In addition, a fourth pipeline 40 is connected in parallel outside the experimental chamber 500, and a seventh control valve V7 is installed on the fourth pipeline 40. When the seventh control valve V7 is opened, some of the liquid lead-bismuth alloy can be diverted through the fourth pipeline 40, thereby better controlling the flow rate of the liquid lead-bismuth alloy flowing through the experimental chamber 500.

[0044] Among them, such as Figure 2 , Figure 3 As shown, the experimental chamber 500 includes an outer shell 510, inside which a through-flow channel 511 is provided for the liquid lead-bismuth alloy to flow through. A removable support core 520 is provided on the flow channel 511, and several experimental devices 530 are mounted on the support core 520. The experimental devices 530 are mounted on the support core 520 in a detachable and replaceable manner. Figure 3As shown, in some embodiments, the inner wall of the support core 520 is provided with a plurality of mounting slots 521. The size and spacing of the mounting slots 521 are designed according to experimental requirements. The mounting slots 521 are used to fix the experimental device 530. The experimental device 530 is installed by snapping into the mounting slot 521, realizing convenient and quick assembly and disassembly, so as to facilitate the adjustment of the number of experimental devices 530. In addition, it is conceivable that in other embodiments, the experimental device 530 can also be connected and fixed to the support core 520 by means of snap-fit, bolt connection or other detachable means. The experimental device 530 can be at least one of rod bundle, heat transfer tube, plate assembly or mesh assembly. The installed experimental device 530 is located in the flow channel 511, which simulates the internal structure of rod bundle channel and heat transfer tube channel. A first pressure gauge is provided at the inlet end of the flow channel 511 to measure the pressure P of the liquid lead-bismuth alloy before it enters the experimental chamber 500. in A second pressure gauge is installed at the outlet end of flow channel 511 to measure the pressure P when liquid lead-bismuth alloy flows out of experimental chamber 500. out .

[0045] Furthermore, in some embodiments, the first flow meter 200, the second flow meter, and the third flow meter are Venturi flow meters. The first pressure gauge and the second pressure gauge are diaphragm differential pressure gauges, and the specific range and accuracy are determined according to experimental requirements and parameter ranges.

[0046] Furthermore, in some embodiments, the supporting inner core 520 can be embedded inside the flow channel 511 by any of the following methods: snap-fit ​​connection, bolt connection, or cap fixation. In addition, the outer shell 510 has a stepped structure inside to fix the position of the supporting inner core 520 while ensuring that the cross-section of the flow channel 511 is unobstructed.

[0047] Furthermore, such as Figure 3 As shown, in some embodiments, flanges 540 are provided at both ends of the experimental chamber 500, which can quickly connect the experimental chamber 500 to the first pipeline 10 and the second pipeline 20 while ensuring sealing.

[0048] like Figure 1 As shown, in some embodiments, a heat exchanger 600 is provided on the second pipeline 20. The heat exchanger 600 is generally provided corresponding to the heater 400. The heat exchanger 600 is used to regulate the temperature of the liquid lead-bismuth alloy after the experiment is completed, so as to ensure that the temperature of the refluxed liquid lead-bismuth alloy is kept close to the room temperature.

[0049] like Figure 1As shown, in some embodiments, a temperature sensor is installed inside the flow channel 511. The temperature sensor is connected to a temperature meter 503, which can display the temperature inside the experimental chamber 500 in real time, thereby better recording and analyzing the flow resistance of the liquid lead-bismuth alloy under different environments. Furthermore, temperature sensors can also be installed at the inlet and outlet ends of the flow channel 511 to detect the temperature T of the liquid lead-bismuth alloy entering the flow channel 511. in The temperature T of the liquid lead-bismuth alloy flowing out of channel 511 out This enables more accurate recording and analysis. Furthermore, in some embodiments, the temperature sensor preferably uses a sheathed thermocouple, with the specific range and accuracy determined based on experimental requirements and parameter ranges.

[0050] like Figure 1 As shown, in some embodiments, an oxygen control box 700 is provided on the second pipeline 20 to meet the basic requirements for oxide control in long-cycle experimental circuits.

[0051] like Figure 1 As shown, in some embodiments, a filling and venting circuit 50 is provided between the oxygen control box 700 and the liquid storage container 100. The filling and venting circuit 50 includes a gas cylinder 800 connected between the oxygen control box 700 and the liquid storage container 100. A tenth control valve V10 is provided at the outlet of the gas cylinder 800, an eighth control valve V8 is provided between the gas cylinder 800 and the oxygen control box 700, and a ninth control valve V9 is provided between the gas cylinder 800 and the liquid storage container 100. The filling and venting circuit 50 is used to complete the cleaning of experimental pipelines and pressure regulation.

[0052] Furthermore, this application also discloses an experimental method based on the above-mentioned liquid lead-bismuth alloy flow resistance experimental device, including the following steps: S1, removing the support core 520 from the outer shell 510, replacing it with the experimental device 530 to be tested, and after replacement, placing the support core 520 back into the outer shell 510 and fixing it; S2, turning on the delivery pump 300 to allow the liquid lead-bismuth alloy in the storage container 100 to flow through the experimental chamber 500; S3, measuring the total flow rate Q of the liquid lead-bismuth alloy using the first flow meter 200. in The pressure P of the liquid lead-bismuth alloy before it enters the experimental chamber is measured using the first pressure gauge. in The pressure P of the liquid lead-bismuth alloy flowing out of the experimental chamber at 500°C was measured using a second pressure gauge. out S4. Based on the measurement results of step S3, the pressure drop ΔP = P after the liquid lead-bismuth alloy flows through the experimental chamber at 500°C is obtained. in -P out , by △P and Q in Calculate and analyze the flow resistance of the liquid lead-bismuth alloy; S5, turn off the transfer pump 300, and end the experiment.

[0053] Furthermore, in step S5 above, after shutting down the delivery pump 300, the eighth control valve V8 and the tenth control valve V10 are opened. The high-pressure gas sent from the gas cylinder 800 passes through the second pipeline 20, the experimental chamber 500 and the first pipeline 10 in sequence, and then reaches the liquid storage container 100. The residual liquid lead-bismuth alloy in the second pipeline 20, the experimental chamber 500 and the first pipeline 10 is cleaned back into the liquid storage container 100, thus completing the cleaning of the experimental pipeline.

[0054] This application proposes an experimental apparatus and method for studying the flow resistance of liquid lead-bismuth alloy. By disassembling and replacing the experimental devices 530 inside the experimental chamber 500, the internal structure of the rod bundle channel and heat transfer tube channel can be simulated. This allows for the measurement and study of the flow resistance characteristics of liquid lead-bismuth alloy under different structures, obtaining a flow resistance model of lead-bismuth alloy. This model can be used for research on lead-bismuth alloy-related technologies, the construction of thermal-hydraulic characteristic models in lead-bismuth fast reactors, and phenomenon analysis. Furthermore, this application allows for the adjustment of the number of experimental devices 530 by disassembling them, enabling the study of flow resistance characteristics under various structural parameters, thus reducing experimental and labor costs.

[0055] The above embodiments merely illustrate specific implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application's patent. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of this application, and can also make several modifications and improvements, all of which fall within the protection scope of this application. Therefore, any equivalent transformations and modifications made within the scope of the claims of this application should be covered by the claims of this application.

Claims

1. An experimental apparatus for the flow resistance of liquid lead-bismuth alloy, characterized in that, The system includes a liquid storage container (100) and an experimental chamber (500) connected by a pipeline. The liquid storage container (100) is used to store liquid lead-bismuth alloy. A transfer pump (300) is provided on the pipeline. The liquid lead-bismuth alloy circulates between the liquid storage container (100) and the experimental chamber (500) through the transfer pump (300). The pipeline between the outlet end of the liquid storage container (100) and the inlet end of the experimental chamber (500) is a first pipeline (10). The pipeline between the outlet end of the experimental chamber (500) and the inlet end of the liquid storage container (100) is a second pipeline (20). A first flow meter (200) is provided on the first pipeline (10). The experimental chamber (500) includes an outer shell (510), inside which a through-flow channel (511) is provided for the liquid lead-bismuth alloy to flow through. A removable support core (520) is provided on the flow channel (511), and a number of detachable and replaceable experimental devices (530) are provided on the support core (520). The experimental devices (530) are located inside the flow channel (511). A first pressure gauge is provided at the inlet end of the flow channel (511), and a second pressure gauge is provided at the outlet end of the flow channel (511). The inner wall of the supporting core (520) is provided with a number of mounting slots (521). The experimental device (530) is installed by being inserted into the mounting slots (521) to facilitate adjustment of the number of the experimental device (530). The experimental device (530) is at least one of a rod bundle, a heat transfer tube, a plate assembly, or a mesh assembly.

2. The experimental apparatus for the flow resistance of liquid lead-bismuth alloy according to claim 1, characterized in that, Two experimental boxes (500) are provided. The experimental box (500) includes a first experimental box and a second experimental box. The experimental box (500) includes a first branch and a second branch. The first experimental box is set on the first branch, and the second experimental box is set on the second branch. The first branch and the second branch are connected in parallel.

3. The experimental apparatus for the flow resistance of liquid lead-bismuth alloy according to claim 2, characterized in that, A second flow meter (501) and a fifth control valve (V5) are provided on the first branch. The second flow meter (501) and the fifth control valve (V5) are located between the outlet end of the liquid storage container (100) and the inlet end of the first experimental box. A third flow meter (502) and a sixth control valve (V6) are provided on the second branch. The third flow meter (502) and the sixth control valve (V6) are located between the outlet end of the liquid storage container (100) and the inlet end of the second experimental chamber.

4. The experimental apparatus for the flow resistance of liquid lead-bismuth alloy according to claim 1, characterized in that, The first pipeline (10) is equipped with a heater (400) for heating the liquid lead-bismuth alloy. A heat exchanger (600) is provided on the second pipeline (20), which is used to regulate the temperature of the liquid lead-bismuth alloy after the experiment is completed.

5. The experimental apparatus for the flow resistance of liquid lead-bismuth alloy according to claim 4, characterized in that, A third pipeline (30) is connected in parallel to the heater (400), a second control valve (V2) is provided on the third pipeline (30), and a third control valve (V3) is provided between the liquid storage container (100) and the heater (400).

6. The experimental apparatus for the flow resistance of liquid lead-bismuth alloy according to claim 4, characterized in that, A temperature sensor is provided in the flow channel (511), and the temperature sensor is connected to a temperature meter (503).

7. The experimental apparatus for the flow resistance of liquid lead-bismuth alloy according to claim 1, characterized in that, An oxygen control box (700) is installed on the second pipeline (20).

8. The experimental apparatus for the flow resistance of liquid lead-bismuth alloy according to claim 7, characterized in that, A filling and venting circuit (50) is provided between the oxygen control box (700) and the liquid storage container (100). The filling and venting circuit (50) includes a gas cylinder (800) connected between the oxygen control box (700) and the liquid storage container (100). A tenth control valve (V10) is provided at the outlet end of the gas cylinder (800). An eighth control valve (V8) is provided between the gas cylinder (800) and the oxygen control box (700). A ninth control valve (V9) is provided between the gas cylinder (800) and the liquid storage container (100).

9. An experimental method based on the experimental apparatus for testing the flow resistance of liquid lead-bismuth alloy according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Remove the inner support core (520) from the outer shell (510), replace it with the experimental device (530) to be tested, and after replacement, put the inner support core (520) back into the outer shell (510) and fix it. S2. Turn on the delivery pump (300) to allow the liquid lead-bismuth alloy in the storage container (100) to flow through the experimental chamber (500). S3. Measure the total flow rate Q of the liquid lead-bismuth alloy using the first flow meter (200). in The pressure P of the liquid lead-bismuth alloy before entering the experimental chamber (500) was measured using the first pressure gauge. in The pressure P when the liquid lead-bismuth alloy flows out of the experimental chamber (500) is measured by the second pressure gauge. out ; S4. Based on the measurement results of step S3, obtain the pressure drop ΔP after the liquid lead-bismuth alloy flows through the experimental chamber (500). ΔP and Q in Calculate and analyze the flow resistance of liquid lead-bismuth alloy; S5. Turn off the delivery pump (300) to end the experiment.

10. The experimental method according to claim 9, characterized in that, An oxygen control box (700) is provided on the second pipeline (20). An air filling and venting circuit (50) is provided between the oxygen control box (700) and the liquid storage container (100). The air filling and venting circuit (50) includes a gas cylinder (800) connected between the oxygen control box (700) and the liquid storage container (100). A tenth control valve (V10) is provided at the outlet of the gas cylinder (800). An eighth control valve (V8) is provided between the gas cylinder (800) and the oxygen control box (700). A ninth control valve (V9) is provided between the gas cylinder (800) and the liquid storage container (100). In step S5 above, after shutting down the delivery pump (300), the eighth control valve (V8) and the tenth control valve (V10) are opened. The high-pressure gas sent from the gas cylinder (800) passes through the second pipeline (20), the experimental chamber (500) and the first pipeline (10) in sequence, and then reaches the liquid storage container (100). The remaining liquid lead-bismuth alloy in the second pipeline (20), the experimental chamber (500) and the first pipeline (10) is cleaned back into the liquid storage container (100).

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