Fuel salt reactor core flow heat transfer behavior visualization experiment system under ocean condition

Abstract

The invention discloses a fuel salt reactor core flow heat transfer behavior visualization experiment system under an ocean condition. The system comprises a fuel salt reactor simulation experiment body, a six-degree-of-freedom motion platform for simulating the ocean condition, a PIV optical measurement system and a cooling system, the fuel salt reactor simulation experiment body comprises a transparent experiment tank, heat conduction oil, a plurality of heat pipes, a plurality of electric heating wires and a plurality of thermocouples, the heat conduction oil is contained in the transparent experiment tank, the heat pipes and the electric heating wires are vertically arranged in the heat conduction oil, the condensation ends of the heat pipes are connected with the cooling system, and the heat pipes and the electric heating wires are arranged at intervals in the radial direction of the transparent experiment tank; the thermocouple is transversely arranged in the transparent experiment tank; the transparent experiment tank is installed on the six-degree-of-freedom motion platform. By introducing the low-temperature heat conduction oil as a low-temperature working medium for simulating the fuel salt, the system can realize the dynamic simulation of the flow and heat transfer characteristics of the fuel salt within a safe temperature range, and avoids the complexity and danger of a high-temperature experiment.

Description

Technical Field

[0001] The invention belongs to the field of nuclear energy technology and thermal hydraulics, and in particular relates to a visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under marine conditions. Background Art

[0002] As a potential technology for future ship propulsion, fuel salt reactors have shown important advantages in meeting the needs of long-term, high-intensity operation with their high efficiency and stability. However, the marine environment is complex and changeable, and the swaying operating conditions caused by waves may have a significant impact on the flow and heat transfer characteristics of fuel salt reactors. The natural convection and heat transfer characteristics of fuel salt in the core tube bundle area have not been fully revealed. The laws and microscopic mechanisms of the dynamic marine environment, such as periodic motion and temperature fluctuations, on the flow pattern and heat transfer efficiency of fuel salt are still unclear. The fluid behavior and heat transfer laws of fuel salt in the core need further study.

[0003] Directly using fuel salt to conduct experiments is a traditional method for studying the operating characteristics of fuel piles, but this method faces a series of difficult-to-overcome technical challenges. The preparation process of fuel salt is complicated and expensive, and its physical properties determine that the experiment must meet high temperature, high pressure and sealing requirements. The corrosiveness and toxicity of fuel salt also pose safety risks to personnel. These problems increase the difficulty of designing experimental equipment, place extremely high demands on laboratory environment and personnel safety, and limit the feasibility of the experiment.

[0004] At the same time, traditional high-temperature fuel salt experimental equipment usually lacks effective visualization technology, and cannot fully observe the transient characteristics of complex flow fields, nor can it fully capture the transient flow and heat transfer characteristics of fuel salt under complex dynamic conditions. The research on vortex generation, boundary layer behavior and local heat transfer laws is still insufficient. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a visualization experimental system for the flow and heat transfer behavior of a fuel salt reactor core under marine conditions to solve the technical problems encountered in high-temperature experiments of fuel salt. By introducing low-temperature heat transfer oil as a low-temperature working fluid to simulate fuel salt, the system can realize dynamic simulation of the flow and heat transfer characteristics of fuel salt within a safe temperature range, avoiding the complexity and danger of high-temperature experiments.

[0006] To achieve the above object, the technical solution of the present invention is: A visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under ocean conditions, comprising: a fuel salt reactor simulation experimental body, a six-degree-of-freedom motion platform simulating ocean conditions, a PIV optical measurement system, and a cooling system; The fuel salt pile simulation experiment body comprises a transparent experiment tank, heat transfer oil, a plurality of heat pipes, a plurality of electric heating wires and a plurality of thermocouples, wherein the heat transfer oil is contained in the transparent experiment tank, the heat pipes and the electric heating wires are both vertically arranged in the heat transfer oil, and the condensation end of the heat pipe is connected to the cooling system, the heat pipes and the electric heating wires are arranged at intervals along the radial direction of the transparent experiment tank, and the thermocouples are transversely arranged in the transparent experiment tank; The transparent experimental tank is installed on the six-degree-of-freedom motion platform.

[0007] In a preferred embodiment of the present invention, the heat transfer oil is heat transfer oil Drakesol 260AT.

[0008] In a preferred embodiment of the present invention, the electric heating wire comprises an inner layer and an outer layer, and different powers are input into the inner layer and the outer layer to simulate the uneven power distribution phenomenon caused by the uneven distribution of neutron flux in the core of the fuel stack.

[0009] In a preferred embodiment of the present invention, the thermocouples are evenly arranged in the transparent test tank to form a grid-like measurement system through cross distribution.

[0010] In a preferred embodiment of the present invention, a PIV optical system is arranged around the fuel-salt pile simulation experimental body.

[0011] In a preferred embodiment of the present invention, the PIV optical system includes a laser light source, a lens group and a spectroscopic element. The high-energy beam emitted by the laser light source is reflected by the spectroscopic element and then the shape and size of the laser beam are adjusted by the lens group so that it evenly covers the fuel salt pile simulation experimental body.

[0012] In a preferred embodiment of the present invention, a plurality of high-resolution digital cameras are installed around the fuel-salt pile simulation experimental body.

[0013] In a preferred embodiment of the present invention, the cooling system comprises a water tank, a compressor, an air cooler, an evaporator and a cooling water jacket, the evaporator is arranged in the water tank, the outlet of the compressor is connected to the inlet of the air cooler, the outlet of the air cooler is connected to the outlet of the evaporator, and the outlet of the evaporator is connected to the inlet of the compressor; The outlet of the water tank is connected to the inlet of the cooling water jacket, the outlet of the cooling water jacket is connected to the inlet of the water tank, and the cooling water jacket is arranged on the cold end of the heat pipe.

[0014] In a preferred embodiment of the present invention, the cooling system further comprises a centrifugal pump and a mass flow meter, the centrifugal pump is arranged at the outlet of the water tank, and the mass flow meter is arranged between the centrifugal pump and the inlet of the cooling water jacket.

[0015] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art: The present invention uses low-temperature heat transfer oil as a low-temperature working fluid to simulate fuel salt, and the heat transfer oil is filled into a transparent experimental tank to simulate the state of the fuel salt in the core tube bundle area; and an electric heating wire is vertically arranged in the heat transfer oil to simulate the release of heat from the fuel salt pile, and a heat pipe is also vertically arranged in the heat transfer oil to simulate the heat transfer characteristics of the fuel salt pile. Furthermore, the electric heating wire and the heat transfer oil are arranged radially at intervals to be as close to the prototype reactor as possible. A thermocouple is arranged in the experimental tank to capture the real-time temperature field distribution of the heat transfer oil, and the transparent experimental tank is installed on a six-degree-of-freedom motion platform. The six-degree-of-freedom motion platform is used to simulate the ocean swaying conditions to study the transient fluid characteristics and heat transfer laws under dynamic conditions.

[0016] The experimental system of the present invention ensures the accuracy and reliability of experimental data under multiple marine conditions. The experimental structure can provide important support for marine engineering, nuclear energy applications and equipment performance optimization in extreme environments, promote technological progress in related fields, and improve the safety, reliability and energy efficiency of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under ocean conditions according to an embodiment of the present invention; Figure 2 A vertical cross-sectional schematic diagram of a fuel salt pile simulation test body according to an embodiment of the present invention; Figure 3 A schematic cross-sectional view of a fuel-salt pile simulation experimental body according to an embodiment of the present invention.

[0018] Description of reference numerals: 1-fuel salt pile simulation test body; 101-transparent test tank; 102-heat transfer oil; 103-heat pipe; 104-electric heating wire; 105-multiple thermocouples; 2-six degrees of freedom motion platform; 3-PIV optical measurement system; 301-laser light source; 302-lens group; 303-spectroscopy element; 4-Cooling system; 401-Water tank; 402-Compressor; 403-Air cooler; 404-Evaporator; 405-Cooling water jacket; 406-Centrifugal pump; 407-Mass flow meter; 408-Bypass valve; 5-High-resolution digital camera. DETAILED DESCRIPTION

[0019] The following is a further detailed description of a visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under ocean conditions proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description.

[0020] See also Figure 1 , a visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under ocean conditions, comprising: a fuel salt reactor simulation experimental body 1, a six-degree-of-freedom motion platform 2 simulating ocean conditions, a PIV optical measurement system 3 and a cooling system 4; The fuel salt reactor simulation test body 1 includes a transparent test tank 101, heat transfer oil 102, a plurality of heat pipes 103, a plurality of electric heating wires 104 and a plurality of thermocouples 105. The heat transfer oil 102 is contained in the transparent test tank 101. The heat pipes 103 and the electric heating wires 104 are vertically arranged in the heat transfer oil 102. The condensation end of the heat pipe 103 is connected to the cooling system 4. The heat pipes 103 and the electric heating wires 104 are arranged at intervals along the radial direction of the transparent test tank 101. The thermocouples are arranged transversely in the transparent test tank 101. The transparent experimental tank 101 is installed on a six-degree-of-freedom motion platform 2 .

[0021] The heat conducting oil 102 uses low-temperature heat conducting oil 102 as the low-temperature working fluid for simulating the fuel salt, and the heat conducting oil 102 is filled into the transparent experimental tank 101 to simulate the state of the fuel salt in the core tube bundle area. The electric heating wire 104 and the heat pipe 103 are vertically arranged in the heat conducting oil 102. The electric heating wire 104 is used to simulate the heating area of ​​the fuel salt. The electric heating wire 104 is longitudinally arranged in the fuel salt pile simulation experimental body 1, and is evenly distributed longitudinally along the transparent experimental tank 101 to ensure the uniformity of the heat source distribution. The electric heating wire 104 is made of high-temperature resistant materials, such as tungsten wire or nickel-chromium alloy wire, which has a high resistance and can effectively provide a stable heat source. The heat pipe 103 is longitudinally distributed in the heat conducting oil 102 along the transparent experimental tank 101 to simulate the heat transfer characteristics of the fuel pile outward.

[0022] Thermocouples are arranged in the fuel salt pile simulation experiment body 1 in a cross-distribution manner at different positions of the fuel salt pile simulation experiment body 1 to form an accurate temperature measurement matrix, ensuring that temperature changes can be monitored in real time during the experiment, and the temperature field can be accurately analyzed through the data processing system. The arrangement of thermocouple wires at each measurement point takes into account the change in temperature gradient, which can effectively capture local temperature changes and ensure high accuracy of experimental data.

[0023] The heat release from the fuel salt pile is simulated, and a heat pipe 103 is vertically arranged in the heat transfer oil 102 to simulate the heat transfer characteristics of the fuel salt pile. A cooling system 4 is connected to the cold end of the heat pipe 103. The design of the cooling system 4 is the key to ensure the stable operation of the core simulation body.

[0024] The transparent experimental tank 101 is installed on the six-degree-of-freedom motion platform 2, and the six-degree-of-freedom motion platform 2 is used to simulate the ocean swaying conditions to study the transient fluid characteristics and heat transfer laws under dynamic conditions. The six-degree-of-freedom motion platform 2 can simulate different types of ocean motion, such as periodic rolling, pitching and other motion modes, to study the effects of these motions on the flow and heat transfer process in the core simulation body. The adjustment system of the six-degree-of-freedom motion platform 2 can accurately control the frequency, amplitude and direction of the swaying, and simulate the typical motion conditions in the ocean through the motion platform, so as to observe the transient changes of the ocean motion on the flow and temperature distribution of the heat transfer oil 102. In the dynamic experiment, multiple data such as temperature, flow rate and pressure are collected in real time to analyze the effects of ocean motion on the natural convection, heat transfer and fluid dynamics characteristics of the core. The fuel salt reactor simulation experiment body 1 is firmly mounted on the motion platform through a fixing device to ensure the integrity of the system and the safety of the experiment in a dynamic environment.

[0025] Further, from the cross section of the fuel-salt reactor simulation experimental body 1, there are multiple rings with the center point as the center, at least a first ring, a second ring and a third ring, assuming that the heat pipe 103 is arranged at the center point, the electric heating wire 104 is evenly arranged on the first ring, the heat pipe 103 is evenly arranged on the third ring, and so on, so that the electric heating wire 104 and the heat pipe 103 are arranged at intervals in the radial direction, so as to be as close to the prototype reactor as possible.

[0026] The positions of the electric heating wire 104 and the heat pipe 103 are determined by the power released by the prototype core fuel salt and the heat transfer power distribution of the heat pipe 103. The heat release of the prototype core fuel salt is distributed at various positions where the fuel salt is located. The present invention uses heating wires arranged at local positions of the core to simulate the heat release of the fuel salt. In order to meet the distribution of power in the simulation body close to that of the prototype reactor, the core is divided into multiple control units along the radial direction. Based on the calculation results of the neutron dynamics core power distribution, the power density volume integration of the control unit is performed, and the heat release power of each control unit and the heat transfer power of the heat pipe 103 are calculated to obtain the relative power distribution of each control unit; on this basis, the experimental core simulation body is also divided into multiple control units along the radial direction, and the electric heating wire 104 and the heat pipe 103 are arranged in each control unit. The size of the heating wire needs to meet the effect on the core flow field that can be ignored, and at the same time, it can ensure that the power of the heating wire meets the power requirements of the control body unit. Therefore, it is necessary to carry out numerical simulation of the flow in the core simulation body before the experiment begins, and determine the final applicable heating wire size by comparing the flow field effects of heating wires of multiple sizes. The determination of the heat transfer power of the heating wire and the heat pipe 103 needs to be obtained based on experimental modeling analysis, and the determined heating power can satisfy the matching of parameters such as the dimensionless heat source factor between the experimental simulation body and the prototype reactor.

[0027] The electric heating wire 104 adopts an inner and outer double-layer structure of heating wire, and different powers are input to the inner and outer layers to simulate the uneven power distribution phenomenon caused by the uneven distribution of neutron flux in the fuel pile core. The central area of ​​the core generates higher heat due to the large neutron flux, while the outer area generates lower heat due to the small neutron flux. The power input of the inner and outer heating wires of the inner and outer double-layer structure is different. The power of the inner heating wire is higher to simulate the higher heat generation in the central area of ​​the core; the power of the outer heating wire is lower to simulate the lower heat generation in the outer area of ​​the core. Local power density differences can be achieved in the core simulation body, thereby simulating the uneven power distribution caused by different neutron fluxes in the actual molten salt reactor.

[0028] In this embodiment, the heat transfer oil 102 is heat transfer oil Drakesol 260AT.

[0029] The calculation of low-temperature modeling is the key to ensure that the heat transfer oil can effectively simulate the flow and heat transfer characteristics of high-temperature fuel salt under low-temperature conditions. In this experimental system, the heat transfer oil Drakesol 260AT is selected as an alternative working fluid. Based on the physical properties (density, specific heat capacity, thermal conductivity, viscosity, etc.) and flow characteristics of high-temperature fuel salt (such as FLiBe), its dimensionless parameters, such as Prandtl number (Pr) and Reynolds number (Re), are matched to meet the similarity in physical properties. It is calculated by the following relationship: The Prandtl number (Pr) defines the ratio of the momentum diffusion rate to the thermal diffusivity of a fluid, expressed as: where c p is the specific heat capacity, μ is the dynamic viscosity, v is the kinematic viscosity, and α is the thermal diffusivity.

[0030] The Reynolds number (Re) is defined as the ratio of the fluid inertia force to the viscous force, expressed as: Where ρ is the fluid density, v is the fluid characteristic velocity, and D is the characteristic length.

[0031] When designing the experiment, it is necessary to ensure that the working fluid temperature is consistent with the fuel salt Prandtl number in the working range. At the same time, the geometric dimensions of the core simulation body are controlled to achieve the similarity of characteristic length under scaled conditions; and the movement intensity is determined according to the actual fuel salt flow range to ensure that the experimental conditions are consistent with the actual molten salt reactor operation status.

[0032] The PIV optical system is arranged around the fuel salt pile simulation experimental body 1, and multiple high-resolution digital cameras 5 are also installed around the fuel salt pile simulation experimental body 1. The PIV system irradiates the experimental area with a high-energy laser and captures the movement of tracer particles in the flow field with a high-resolution digital camera, thereby calculating the velocity field of the fluid. The PIV technology can measure the flow velocity and flow characteristics of the heat transfer oil 102 in the fuel salt pile simulation experimental body 1 in real time, providing accurate flow data support.

[0033] The PIV optical system includes a laser light source 301, a lens group 302 and a spectroscopic element 303. The laser light source 301 provides the high-energy light beam required for particle imaging velocity measurement. The emitted high-energy beam is reflected by the spectroscopic element 303 and then adjusted in shape and size by the lens to evenly cover the fuel salt reactor simulation experimental body 1. The high-resolution digital camera 5 is installed at multiple angles to record the detailed changes of the flow field inside the core in real time, providing a basis for subsequent data analysis.

[0034] In terms of temperature measurement, in order to accurately measure the temperature distribution in the fuel salt pile simulation body, multi-point temperature measurement technology was used to build a three-dimensional temperature distribution detection system for the fuel salt pile simulation body. Figure 2-3 As shown in the figure, the temperature measurement uses an upper and lower layer of thermocouples. The thermocouples are evenly arranged in the upper and lower layers of the fuel salt pile simulation body, forming a grid-like measurement system through cross distribution. Each measurement point monitors the temperature change in real time, forming an accurate temperature detection network, accurately capturing the temperature change at different positions inside the fuel salt pile simulation body, and constructing the three-dimensional temperature field of the core.

[0035] This experimental system also designs the circulating constant temperature of the cooling water jacket 405 and the cooling system 4. The design of the cooling system 4 is the key to ensure the stable operation of the fuel salt reactor simulation body. The cooling water jacket 405 is installed at the cold end of the heat pipe 103, and the excess heat in the core simulation body is taken away by circulating cooling water to keep the temperature of the core simulation body stable. The water jacket design ensures that the cold end of the heat pipe 103 is not in direct contact with the cooling water, avoiding the heat exchange between the cooling water and the heat pipe 103 affecting the experimental data. The cooling water jacket 405 is isolated from the heat pipe 103 by the gas environment to ensure that the ambient temperature outside the heat pipe 103 is constant and maintain the cooling effect.

[0036] The cooling system 4 includes a water tank 401, a compressor 402, an air cooler 403, an evaporator 404 and a cooling water jacket 405. The evaporator 404 is arranged in the water tank 401. The outlet of the compressor 402 is connected to the inlet of the air cooler 403, the outlet of the air cooler 403 is connected to the outlet of the evaporator 404, and the outlet of the evaporator 404 is connected to the inlet of the compressor 402. The compressor 402, the air cooler 403 and the evaporator 404 are used to cool down the water in the water tank 401. The outlet of the water tank 401 is connected to the inlet of the cooling water jacket 405 , and the outlet of the cooling water jacket 405 is connected to the inlet of the water tank 401 . The cooling water jacket 405 is sleeved on the cold end of the heat pipe 103 .

[0037] The cooling system 4 also includes a centrifugal pump 406 and a mass flow meter 407. The centrifugal pump 406 is arranged at the outlet of the water tank 401, and the mass flow meter 407 is arranged between the centrifugal pump 406 and the inlet of the cooling water jacket 405. The cooling water in the cooling system 4 is provided with a stable flow by the centrifugal pump 406, and continuously flows through the circulation loop to take away the heat of the cold end of the heat pipe 103. The cooling system 4 is also designed with a mass flow meter 407, which can adjust the water flow. The cooling system 4 is also designed with a bypass valve 408. A pipeline is set at the outlet of the centrifugal pump 406 to connect with the inlet of the water tank 401. The bypass valve 408 is set on the pipeline to adjust the cooling intensity of the cooling water, keep the cooling water temperature constant, and ensure the stability of the temperature in the experiment. The operating conditions and water flow control of the cooling system 4 can be adjusted according to different experimental requirements to ensure the stability and reliability of the temperature during the experiment.

[0038] The key points of the present invention are: low-temperature heat transfer oil 102 is used to replace high-temperature fuel salt, and its physical parameters match those of high-temperature fuel salt, which can accurately simulate the flow and heat transfer characteristics of fuel salt under low-temperature conditions; the experimental device adopts high-precision temperature measurement matrix and particle image velocimetry technology, which can obtain the temperature field and flow field distribution of the core tube bundle area in real time, and provide data support for the study of natural convection and its heat transfer mechanism; the six-degree-of-freedom motion platform 2 can simulate a variety of ocean wave conditions, and study the influence of dynamic environment on the heat transfer characteristics of fuel salt, so as to fully reveal the thermal flow behavior of fuel salt under complex operating conditions. The system also designs a non-contact optical measurement system to monitor the details of fluid movement in the experimental area with high resolution, and deeply explore the flow and heat transfer microscopic mechanism of fuel salt under dynamic conditions.

[0039] The experimental system of the present invention can study the natural convection heat transfer characteristics of fuel salt under static and dynamic conditions. In the static experiment, the system measures the flow and heat transfer characteristics of the fuel salt simulated working fluid at a constant temperature as the benchmark data; in the dynamic experiment, the six-degree-of-freedom motion platform 2 simulates various ocean wave conditions, collects experimental data in real time, and studies the influence of the wave environment on the heat transfer efficiency and fluid movement of the fuel salt. The experimental results will reveal the natural convection law and heat transfer characteristics of the fuel salt under dynamic conditions, and provide important theoretical support and experimental basis for the design and performance optimization of the molten salt core.

[0040] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under ocean conditions, characterized in that: include: A fuel salt pile simulation test body, a six-degree-of-freedom motion platform simulating ocean conditions, a PIV optical measurement system, and a cooling system; The fuel salt pile simulation experiment body comprises a transparent experiment tank, heat transfer oil, a plurality of heat pipes, a plurality of electric heating wires and a plurality of thermocouples, wherein the heat transfer oil is contained in the transparent experiment tank, the heat pipes and the electric heating wires are both vertically arranged in the heat transfer oil, and the condensation end of the heat pipe is connected to the cooling system, the heat pipes and the electric heating wires are arranged at intervals along the radial direction of the transparent experiment tank, and the thermocouples are transversely arranged in the transparent experiment tank; The transparent experimental tank is installed on the six-degree-of-freedom motion platform.

2. The visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under ocean conditions according to claim 1 is characterized in that: The heat transfer oil is heat transfer oil Drakesol 260AT.

3. The visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under ocean conditions according to claim 1 is characterized in that: The electric heating wire comprises an inner layer and an outer layer, and different powers are input into the inner layer and the outer layer to simulate the uneven power distribution phenomenon caused by the uneven distribution of neutron flux in the core of the fuel stack.

4. The visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under ocean conditions according to claim 1, characterized in that: The thermocouples are evenly arranged in the transparent test tank to form a grid-like measurement system through cross distribution.

5. The visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under ocean conditions according to claim 1, characterized in that: A PIV optical system is arranged around the fuel-salt pile simulation experimental body.

6. The visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under ocean conditions according to claim 1, characterized in that: The PIV optical system includes a laser light source, a lens group and a spectroscopic element. The high-energy beam emitted by the laser light source is reflected by the spectroscopic element and then adjusted in shape and size by the lens group so that it evenly covers the fuel salt pile simulation experimental body.

7. The visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under ocean conditions according to claim 5, characterized in that: A plurality of high-resolution digital cameras are also installed around the fuel-salt pile simulation experimental body.

8. The visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under ocean conditions according to claim 1, characterized in that: The cooling system comprises a water tank, a compressor, an air cooler, an evaporator and a cooling water jacket, wherein the evaporator is arranged in the water tank, the outlet of the compressor is connected to the inlet of the air cooler, the outlet of the air cooler is connected to the outlet of the evaporator, and the outlet of the evaporator is connected to the inlet of the compressor; The outlet of the water tank is connected to the inlet of the cooling water jacket, the outlet of the cooling water jacket is connected to the inlet of the water tank, and the cooling water jacket is arranged on the cold end of the heat pipe.

9. The visualization experimental system for flow and heat transfer behavior of a fuel salt reactor core under ocean conditions according to claim 8, characterized in that: The cooling system further comprises a centrifugal pump and a mass flow meter. The centrifugal pump is arranged at the outlet of the water tank, and the mass flow meter is arranged between the centrifugal pump and the inlet of the cooling water jacket.

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