Test device and method for simulating bubble behavior of liquid metal cooling reactor

Abstract

The invention provides a liquid metal cooling reactor bubble behavior simulation test device and method, and belongs to the technical field of nuclear engineering. The invention aims to solve the problems of high operating temperature, high power consumption and poor safety of a traditional experimental loop using lead-bismuth alloy as a liquid phase medium, and the defect that a traditional contact measurement method is easy to cause interference on the flow characteristics of fluid. A liquid metal cooling reactor bubble behavior simulation test device comprises a flow channel body, a rod bundle matrix and liquid gallium-indium-tin alloy metal are arranged in the flow channel body, and each rod of the rod bundle matrix is provided with a plurality of gas check valves; the inert gas output assembly is provided with a plurality of gas output ports which are correspondingly connected with the gas injection ports in the rods of the rod bundle matrix; the ultrasonic probe array is arranged on the periphery of the rod bundle matrix and inside the central rod; the inlet end and the outlet end of the fluid circulation assembly are both connected with the flow channel body, and the fluid circulation assembly is used for driving fluid in the flow channel body to act from top to bottom and separating gas out of the flow channel body. The device is mainly used for simulating liquid metal cooling reactor bubble behaviors.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear engineering, and in particular relates to a test device and method for simulating the bubble behavior of a liquid metal cooling reactor. Background Art

[0002] The steam generator heat transfer tube rupture accident is one of the important benchmark accidents for the safety analysis of the lead-bismuth reactor. In the system design of the lead-bismuth fast reactor, the system pressure on the steam generator side is significantly higher than that on the lead-bismuth side. Therefore, in the accident condition, the working fluid (water and water vapor) on the steam generator side will be ejected into the low-pressure lead-bismuth side through the rupture and quickly vaporize on the lead-bismuth side. Therefore, the steam generator heat transfer tube rupture accident will cause the generation of gas-liquid heavy metal two-phase flow on the lead-bismuth side. In addition, the steam generator heat transfer tubes are usually arranged in a rod bundle shape, which further increases the complexity of the two-phase flow. In order to understand the rupture accident of the steam generator heat transfer tube of the lead-bismuth reactor from a mechanistic level, it is necessary to study in detail the bubble behavior of the gas-liquid heavy metal two-phase flow under the rod bundle effect.

[0003] According to currently available literature and patents, the device used to study the rod beam effect of liquid metal two-phase flow mainly uses lead-bismuth alloy at a relatively high temperature as the liquid medium, and uses a probe or probe to collect relevant parameters. However, the current research methods for the rod beam effect of liquid metal two-phase flow have the following problems:

[0004] The use of lead-bismuth alloy as a liquid medium requires operation at a relatively high temperature (usually above 473K), resulting in high power consumption, high operation and maintenance costs, and high operating risk factors. In addition, lead-bismuth alloy is solid at room temperature, and the waiting time for heating the alloy to liquid metal after the test device is turned on is long, which is not conducive to researchers' research on the rod bundle effect of gas-liquid metal two-phase flow.

[0005] In the rod bundle channel of gas-liquid metal two-phase flow, the flow and heat transfer characteristics of the fluids around the central rod and the edge rod bundle are quite different. Due to the shielding effect of the edge rod bundle, the flow and heat transfer characteristics of the fluids around the central rod are more complicated, which is the focus of the rod bundle effect research. However, conventional invasive measurement methods can hardly collect and study the bubble motion characteristics in the fluid around the central rod bundle without interfering with the fluid flow characteristics when studying the rod bundle effect. Summary of the invention

[0006] In view of this, the present invention aims to propose a test device and method for simulating the bubble behavior of a liquid metal cooled reactor, so as to solve the problem that traditional lead-bismuth alloy as a liquid phase medium needs to operate at a higher temperature, has high power consumption and is easily affected by the collection of fluid flow characteristics.

[0007] To achieve the above object, the present invention adopts the following technical solution. According to one aspect of the present invention, a test device for simulating bubble behavior of a liquid metal cooled reactor is provided, comprising:

[0008] A flow channel body, wherein a rod bundle matrix and liquid gallium-indium-tin alloy metal are arranged inside, and each rod of the rod bundle matrix is ​​provided with a plurality of gas check valves;

[0009] An inert gas output assembly is provided with a plurality of gas output ports, which are connected to the gas injection ports on each rod of the rod bundle matrix;

[0010] An ultrasonic probe array is arranged around the rod bundle matrix;

[0011] The fluid circulation component, whose inlet and outlet ends are both connected to the flow channel body, is used to drive the fluid in the flow channel body to move from top to bottom and separate the gas from the flow channel body.

[0012] Furthermore, the flow channel body is a closed container with a rectangular cross-section.

[0013] Furthermore, the inert gas output assembly includes a gas cylinder, a gas flow meter, a gas flow valve and a gas source distributor which are connected in sequence, and all gas output ports are arranged on the gas source distributor.

[0014] Furthermore, the ultrasonic probe array includes a central rod ultrasonic probe array arranged inside the central rod of the rod bundle matrix and a plurality of edge rod bundle ultrasonic probe arrays arranged on the outer wall of the flow channel body.

[0015] Furthermore, the number of the central rod ultrasound probe array and the edge rod bundle ultrasound probe array are both four and they are arranged in a circumferentially uniform manner, and the central rod ultrasound probe array and the edge rod bundle ultrasound probe array at each corresponding position are arranged relative to each other.

[0016] Furthermore, the height of the gas check valve is lower than the height of the ultrasonic probe array.

[0017] Furthermore, the fluid circulation component includes a fluid drive component, a liquid flow valve, a flow meter and a gas-liquid separator connected in sequence, the inlet end of the fluid drive component is connected to the lower part of the flow channel body, and the liquid end outlet end of the gas-liquid separator is connected to the upper part of the flow channel body.

[0018] Furthermore, the flow channel body is provided with a cover plate, one end of the rod bundle matrix penetrates into the flow channel body through the cover plate, and the gas injection port is arranged outside the flow channel body.

[0019] Furthermore, the ultrasonic probe array and the gas check valve are located between the inlet and outlet of the fluid circulation component.

[0020] According to another aspect of the present invention, there is provided a method for using the above-mentioned test device for simulating bubble behavior of a liquid metal cooled reactor, comprising the following steps:

[0021] Install and debug the test device;

[0022] Control the output gas flow rate of the inert gas output component to the required size for the test;

[0023] The fluid circulation component controls the liquid metal flow rate to the required size for the test;

[0024] Controlling the flow rate of the gas outlet so that a number of rods in the rod bundle matrix are filled with gas;

[0025] Open the predetermined gas check valve on the corresponding rod and adjust its opening to allow bubbles to be generated in the liquid metal at the rate required by the test;

[0026] The center rod ultrasound probe array and the edge rod beam ultrasound probe array are connected to a data acquisition system to transmit the acquired data to a host computer;

[0027] After the collection is completed, the device is shut down, the collected data is analyzed, and a set of test data is obtained.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The test device of the present invention can collect and visualize the rod bundle effect characteristics of the gas-liquid metal two-phase flow at room temperature (298.15K), and can collect information on the movement behavior of bubbles in the full fluid interface including the edge rod bundle and the peripheral fluid of the central rod without interfering with the fluid flow characteristics; by using gallium-indium-tin alloy that is liquid at room temperature as the liquid phase working fluid, the problems of high cost, toxicity, high power level, high danger and long startup time of the traditional test simulation device of the rod bundle effect of the gas-liquid metal two-phase flow using lead-bismuth alloy as the liquid phase working fluid are successfully overcome;

[0030] 2. By using a gas source distributor to pass gas into the hollow rod, the gas escapes from the check valve on the rod in the form of bubbles, effectively simulating the bubble behavior when the heat transfer tube of the steam generator in the liquid metal cooled reactor ruptures;

[0031] 3. By using an ultrasonic probe array matched with a slot seat fixed on the outer surface of the square flow channel body, the bubble characteristics of the peripheral fluid of the edge rod bundle in the rod bundle channel are collected, and by using an ultrasonic probe array in the center rod, the movement characteristics of the bubbles in the peripheral fluid of the center rod under the rod bundle effect are collected;

[0032] 4. By covering the top of the gallium-indium-tin alloy with a layer of potassium hydroxide solution of a certain concentration, the oxidation phenomenon of the gallium-indium-tin alloy can be suppressed to prevent the influence of the oxide film generated by the liquid phase working fluid on the flow characteristics;

[0033] 5. By using a driving pump and a gas-liquid separator, the liquid metal can be driven to flow from top to bottom, thereby simulating the effect of the liquid metal working medium flowing from top to bottom through the rod bundle in a real liquid metal reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0035] Figure 1 This is a schematic structural diagram of a test device for simulating bubble behavior in a liquid metal cooled reactor according to the present invention;

[0036] Figure 2 This is a schematic diagram of the arrangement of the center rod ultrasound probe array of the present invention;

[0037] Figure 3 It is a schematic diagram of the arrangement of the edge rod beam ultrasound probe array of the present invention;

[0038] Figure 4 This is a numbering diagram of the rod bundle matrix and the gas check valve according to the present invention;

[0039] Figure 5 It is a schematic diagram of a second specific implementation mode;

[0040] Figure 6 It is a schematic diagram of specific implementation method three;

[0041] Figure 7 It is a schematic diagram of a fourth specific implementation method.

[0042] Channel body 1; rod bundle matrix 2; cover plate 3; ultrasonic probe array 4; center rod ultrasonic probe array 4-a; edge rod bundle ultrasonic probe array 4-b; gas check valve 5; air pressure balance valve 6; gas cylinder 7; gas flow meter 8; gas flow valve 9; gas source distributor 10; gas output port 10-a; gas injection port 10-b; fluid drive assembly 11; liquid flow valve 12; gas-liquid separator 13; flow meter 14. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0044] It should be noted that the descriptions of the present invention regarding directions such as "left", "right", "left side", "right side", "upper", "lower", "top", "bottom", etc. are all defined based on the relationship between the orientations or positions shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the structure described must be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0045] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Specific implementation method one:

[0047] Referring to the accompanying drawings, this embodiment is described. According to one aspect of the present invention, there is provided a test device for simulating bubble behavior of a liquid metal cooled reactor, comprising:

[0048] A flow channel body 1 is provided with a rod bundle matrix 2 and liquid gallium indium tin alloy metal inside, and each rod of the rod bundle matrix 2 is provided with a plurality of gas check valves 5 of the same height and arranged evenly; by covering a layer of potassium hydroxide solution of a certain concentration on the top of the gallium indium tin alloy, the oxidation phenomenon of the gallium indium tin alloy is suppressed, and the influence of the oxide film generated by the liquid phase working medium on the flow characteristics is prevented.

[0049] The flow channel body 1 is specifically a container with a rectangular cross-section, which is in the shape of a longitudinally placed rectangular parallelepiped as a whole, with an opening on the upper side, which is closed by a cover plate 3. One end of the rod bundle matrix 2 is inserted into the flow channel body 1 by the cover plate 3 and the gas injection port 10-b is arranged outside the flow channel body 1. Specifically, each rod in the rod bundle is a hollow structure with a circular cross-section, a closed lower end, and an upper end connected to the output end of the gas source distributor. A number of evenly arranged gas check valves are provided on the side, and a pressure balancing valve 6 is provided on the cover plate 3 to balance the pressure inside the flow channel body 1.

[0050] The rod bundle matrix 2 includes 9 rods as a whole, and the distribution form is a rectangular 3×3 equal spacing arrangement in a top view. A plurality of gas check valves 5 are evenly distributed along the circumference and have the same height. Specifically, four gas check valves 5 are arranged on each rod, so that the bubble overflow morphology under different states can be simulated. The heights of the gas check valves 5 on different rods can be different.

[0051] The inert gas output assembly is provided with a plurality of gas output ports 10-a, which are connected to the corresponding gas injection ports 10-b on each rod of the rod bundle matrix 2; the gas source distributor 10 can control the opening and closing and flow rate of different gas output ports 10-a through the valves thereon, and further control whether there is gas injection into different gas injection ports 10-b, as well as the generation rate of bubbles in the gas check valves 5 on different rods.

[0052] The ultrasonic probe array 4 is arranged on the side of the rod bundle matrix 2 and inside the central rod; specifically, it includes a central rod ultrasonic probe array 4-a arranged inside the central rod of the rod bundle matrix 2 and a plurality of edge rod bundle ultrasonic probe arrays 4-b arranged on the outer wall of the flow channel body 1. The number of the central rod ultrasonic probe array 4-a and the edge rod bundle ultrasonic probe array 4-b are both four and are arranged in a circumferentially uniform manner. The central rod ultrasonic probe array 4-a and the edge rod bundle ultrasonic probe array 4-b at each corresponding position are arranged relative to each other. The central rod ultrasonic probe array 4-a and the edge rod bundle ultrasonic probe array 4-b are in the form of uniform distribution of inner and outer circles. By using an ultrasonic probe array matched with a slot seat fixed on the outer side of the square flow channel body, the bubble characteristics of the peripheral fluid of the edge rod bundle in the rod bundle channel are collected. By using the ultrasonic probe array inside the central rod, the motion characteristics of the internal bubbles of the peripheral fluid of the central rod under the rod bundle effect are collected. The ultrasonic probe array 4 is specifically installed through the slot seat. By reconstructing the data collected by the center rod ultrasonic probe array 4-a and the edge rod bundle ultrasonic probe array 4-b, a complete interface image of the gas-liquid metal two-phase flow at a horizontal height in the rod bundle channel can be obtained for subsequent analysis. The algorithm required for image reconstruction adopts the existing technology and is not described here. The center rod ultrasonic probe array 4-a includes 4 independent ultrasonic probes, which are installed at the same horizontal height inside the center rod of the rod bundle matrix 2, and the angle between adjacent probe axes is 90°. The edge rod bundle ultrasonic probe array 4-b includes 4 independent ultrasonic probes, which are installed at the same horizontal height on the outer surface of the rectangular flow channel body 1 through a slot seat, and the angle between adjacent probe axes is 90°. The center rod ultrasonic probe array 4-a and the edge rod bundle ultrasonic probe array 4-b are installed at the same horizontal height during the test.

[0053] By injecting gas into different rods in the rod bundle matrix 2 and controlling the opening and closing of different gas check valves 5 on the same rod, rod bundle effect tests of gas-liquid metal two-phase flow under various conditions can be carried out for comparative analysis.

[0054] The fluid circulation component, whose inlet and outlet are both connected to the flow channel body 1 , is used to drive the fluid in the flow channel body 1 to move from top to bottom and separate the gas from the flow channel body 1 .

[0055] In this embodiment, the inert gas output assembly includes a gas cylinder 7, a gas flow meter 8, a gas flow valve 9 and a gas source distributor 10 connected in sequence, and all gas output ports 10-a are arranged on the gas source distributor 10. The various components are connected by pipelines, and the gas in the gas cylinder 7 is helium or nitrogen.

[0056] In this embodiment, the height of the gas check valve 5 is lower than the height of the ultrasonic probe array 4 .

[0057] In this embodiment, the fluid circulation assembly includes a fluid drive assembly 11, a liquid flow valve 12, a flow meter 14 and a gas-liquid separator 13 connected in sequence, the inlet end of the fluid drive assembly 11 is connected to the lower part of the flow channel body 1, and the liquid end outlet end of the gas-liquid separator 13 is connected to the upper part of the flow channel body 1. By monitoring the reading of the gas flow meter 8 and adjusting the opening of the gas flow valve 9, the gas flow rate entering the gas source distributor 10 can be controlled.

[0058] In this embodiment, the ultrasonic probe array 4 and the gas check valve 5 are located between the inlet and outlet of the fluid circulation component. Specifically, an opening is provided at the upper and lower parts of the side wall on either side of the flow channel body 1, one opening is used to communicate with the inlet of the fluid drive component 11, and the other is used to communicate with the liquid end outlet of the gas-liquid separator 13. The fluid drive component 11 is set as a driving pump, and the operation of the driving pump can drive the liquid in the lower part of the flow channel body 1 to flow through the liquid flow valve 12 and the flow meter 14 in sequence and then enter the gas-liquid separator 13. After the gas and liquid are separated, the liquid flows back into the flow channel body 1, thereby forming a flow effect from top to bottom in the flow channel body 1. The ultrasonic probe array 4 and the gas check valve 5 are located between the inlet and outlet of the fluid circulation component to enable the flowing liquid metal to flow through the ultrasonic probe array 4 and the gas check valve 5.

[0059] According to another aspect of the present invention, there is provided a method for using the above-mentioned test device for simulating bubble behavior of a liquid metal cooled reactor, comprising the following steps:

[0060] Install and debug the test device, and open the air pressure balance valve 6;

[0061] Control the output gas flow rate of the inert gas output component to the required size for the test;

[0062] The fluid circulation component controls the liquid metal flow rate to the required size for the test;

[0063] Controlling the flow rate of the gas outlet 10 - a so that the rods in the rod bundle matrix 2 are filled with gas;

[0064] Open the predetermined gas check valve 5 on the corresponding rod and adjust its opening to allow bubbles to be generated in the liquid metal at the rate required by the test;

[0065] The center rod ultrasonic probe array 4-a and the edge rod beam ultrasonic probe array 4-b are connected to the data acquisition system to transmit the collected data to the host computer;

[0066] After the collection is completed, the device is shut down, the collected data is analyzed, and a set of test data is obtained. Specific implementation method 2:

[0068] This embodiment provides a specific collection process of the first type of test data:

[0069] Reference Figure 5 , the specific test method is as follows:

[0070] Arrange the above experimental device, check whether each device is in normal working condition, and open the air pressure balance valve 6 on the cover plate 3;

[0071] Monitor the reading of the gas flow meter 8, and adjust the opening of the gas flow valve 9 to control the gas flow entering the gas source distributor 10 to the required amount for the test;

[0072] Start the driving pump 11, monitor the reading of the flow meter 14, adjust the speed of the driving pump 11 and the opening of the valve 12, and control the flow rate of the liquid metal to the required size of the experiment;

[0073] Open the valve on the gas source distributor 10 and control the flow rate of the gas outlet 10-a to fill the rod 21 with gas;

[0074] Open the gas check valve 514 on the outer side of the rod 21, and adjust the opening of the gas check valve 514 to allow bubbles to be generated in the liquid metal at the rate required by the test;

[0075] The bubble behavior monitoring device includes a center rod ultrasonic probe array 4-a and an edge rod beam ultrasonic probe array 4-b, which are connected to a data acquisition system to transmit data to a host computer PC;

[0076] After the collection is completed, the device is shut down, and the data collected by the central rod ultrasonic probe array 4-a and the edge rod bundle ultrasonic probe array 4-b are analyzed to obtain a set of experimental data on the normal temperature gas-liquid metal two-phase flow rod bundle effect of the edge rod bundle, and the experiment is completed. Specific implementation method three:

[0078] This embodiment provides a specific collection process of the second type of test data:

[0079] Reference Figure 6 , an experimental simulation of the rod bundle effect of a room temperature gas-liquid metal two-phase flow, the experimental method is as follows:

[0080] Arrange the above experimental device, check whether each device is in normal working condition, and open the air pressure balance valve 6 on the cover plate 3;

[0081] Monitor the reading of the gas flow meter 8, and adjust the opening of the gas flow valve 9 to control the gas flow entering the gas source distributor 10 to the required amount for the test;

[0082] Start the driving pump 11, monitor the reading of the flow meter 14, adjust the speed of the driving pump 11 and the opening of the valve 12, and control the flow rate of the liquid metal to the required size of the experiment;

[0083] Open the valve on the gas source distributor 10 and control the flow rate of the gas outlet 10-a so that the rods 22 and 24 are filled with gas;

[0084] Open the gas check valve 523 on the inner side of the rod 22, open the gas check valve 542 on the inner side of the rod 24, adjust the opening of the gas check valve 523 to allow bubbles to be generated in the liquid metal at the rate required by the test, and adjust the opening of the gas check valve 542 to allow bubbles to be generated in the liquid metal at the rate required by the test;

[0085] The bubble behavior monitoring device includes a center rod ultrasonic probe array 4-a and an edge rod beam ultrasonic probe array 4-b, which are connected to a data acquisition system to transmit data to a host computer PC;

[0086] After the collection is completed, the device is shut down, and the data collected by the central rod ultrasonic probe array 4-a and the edge rod bundle ultrasonic probe array 4-b are analyzed to obtain a set of experimental data on the room temperature gas-liquid metal two-phase flow rod bundle effect of the central rod, and the experiment is completed. Specific implementation method four:

[0088] This embodiment provides a specific collection process of the third type of test data:

[0089] Reference Figure 7 , an experimental simulation of the rod bundle effect of a room temperature gas-liquid metal two-phase flow, the experimental method is as follows:

[0090] Arrange the above experimental device, check whether each device is in normal working condition, and open the air pressure balance valve 6 on the cover plate 3;

[0091] Monitor the reading of the gas flow meter 8, and adjust the opening of the gas flow valve 9 to control the gas flow entering the gas source distributor 10 to the required amount for the test;

[0092] Start the driving pump 11, monitor the reading of the flow meter 14, and adjust the opening of the liquid flow valve 12 to control the flow rate of the liquid metal to the required value of the experiment;

[0093] Open the valve on the gas source distributor 10 and control the flow rate of the gas outlet 10-a to fill the rod 25 with gas;

[0094] Open the gas check valve 551, the gas check valve 552, the gas check valve 553, and the gas check valve 554 on the rod 25, and adjust the opening of the gas check valve 551, the gas check valve 552, the gas check valve 553, and the gas check valve 554 to allow bubbles to be generated in the liquid metal at the rate required by the test;

[0095] The bubble behavior monitoring device includes a center rod ultrasonic probe array 4-a and an edge rod beam ultrasonic probe array 4-b, which are connected to a data acquisition system to transmit data to a host computer PC;

[0096] After the collection is completed, the device is shut down, and the data collected by the central rod ultrasonic probe array 4-a and the edge rod bundle ultrasonic probe array 4-b are analyzed to obtain a set of experimental data on the room temperature gas-liquid metal two-phase flow rod bundle effect of the central rod, and the experiment is completed.

[0097] The sensors, controllers and control programs that may be involved in the above description are all existing technologies and will not be described in detail here.

[0098] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A test device for simulating bubble behavior of a liquid metal cooled reactor, characterized in that: include: A flow channel body (1) is provided with a rod bundle matrix (2) and liquid gallium-indium-tin alloy metal inside, and each rod of the rod bundle matrix (2) is provided with a plurality of gas check valves (5); An inert gas output assembly is provided with a plurality of gas output ports (10-a) which are correspondingly connected to the gas injection ports (10-b) on each rod of the rod bundle matrix (2); An ultrasonic probe array (4) is arranged on the peripheral side of the rod bundle matrix (2) and inside the central rod; The fluid circulation component has an inlet end and an outlet end both connected to the flow channel body (1), and is used to drive the fluid in the flow channel body (1) to move from top to bottom and separate the gas from the flow channel body (1).

2. A test device for simulating bubble behavior of a liquid metal cooled reactor according to claim 1, characterized in that: The flow channel body (1) is a closed container with a rectangular cross-section.

3. A test device for simulating bubble behavior of a liquid metal cooled reactor according to claim 1 or 2, characterized in that: The inert gas output assembly comprises a gas cylinder (7), a gas flow meter (8), a gas flow valve (9) and a gas source distributor (10) which are connected in sequence, and all gas output ports (10-a) are arranged on the gas source distributor (10).

4. The device for simulating bubble behavior of a liquid metal cooled reactor according to claim 1, characterized in that: The ultrasonic probe array (4) comprises a central rod ultrasonic probe array (4-a) arranged inside the central rod of the rod bundle matrix (2) and a plurality of edge rod bundle ultrasonic probe arrays (4-b) arranged on the outer wall of the flow channel body (1).

5. The device for simulating bubble behavior of a liquid metal cooled reactor according to claim 4, characterized in that: The number of the central rod ultrasonic probe array (4-a) and the edge rod bundle ultrasonic probe array (4-b) are both four and they are arranged in a circumferentially uniform manner, and the central rod ultrasonic probe array (4-a) and the edge rod bundle ultrasonic probe array (4-b) at each corresponding position are arranged relative to each other.

6. The device for simulating bubble behavior of a liquid metal cooled reactor according to claim 1, characterized in that: The height of the gas check valve (5) is lower than the height of the ultrasonic probe array (4).

7. A test device for simulating bubble behavior of a liquid metal cooled reactor according to claim 1, 2, 4, 5 or 6, characterized in that: The fluid circulation component comprises a fluid drive component (11), a liquid flow valve (12), a flow meter (14) and a gas-liquid separator (13) which are connected in sequence, wherein the inlet end of the fluid drive component (11) is connected to the lower part of the flow channel body (1), and the liquid end outlet end of the gas-liquid separator (13) is connected to the upper part of the flow channel body (1).

8. The device for simulating the bubble behavior of a liquid metal cooled reactor according to claim 7, characterized in that: The flow channel body (1) is provided with a cover plate (3), one end of the rod bundle matrix (2) penetrates into the flow channel body (1) through the cover plate (3), and the gas injection port (10-b) is arranged outside the flow channel body (1).

9. The device for simulating bubble behavior of a liquid metal cooled reactor according to claim 7, characterized in that: The ultrasonic probe array (4) and the gas check valve (5) are located between the inlet end and the outlet end of the fluid circulation component.

10. A method for using the test device for simulating bubble behavior of a liquid metal cooled reactor as claimed in claim 1, 2, 4, 5, 6, 8 or 9, characterized in that: The steps include: Install and debug the test device; Control the output gas flow rate of the inert gas output component to the required size for the test; The fluid circulation component controls the liquid metal flow rate to the required size for the test; Controlling the flow rate of the gas output port (10-a) so that a plurality of rods in the rod bundle matrix (2) are filled with gas; Opening a predetermined gas check valve (5) on the corresponding rod and adjusting its opening to allow bubbles to be generated in the liquid metal at a rate required by the test; The central rod ultrasonic probe array (4-a) and the edge rod beam ultrasonic probe array (4-b) are connected to a data acquisition system to transmit the acquired data to a host computer; After the collection is completed, the device is shut down, the collected data is analyzed, and a set of test data is obtained.

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