Phase change sweating cooling system based on targeted dynamic tracking technology and regulation and control method

Abstract

The invention discloses a phase change sweating cooling system based on a targeted dynamic tracking technology and a regulation and control method, relates to the field of experimental devices, and aims to solve the problem of local cooling performance reduction caused by flow and heat exchange nonuniformity of a porous medium. The phase change sweating cooling system comprises a high-temperature gas generation module used for providing high-temperature gas flow for a sweating cooling test module; the upstream of the sweating cooling test module is connected with the high-temperature gas generation module, and the downstream is connected with a cooler 8; a coolant supply module for providing a coolant; and the dynamic tracking module is used for identifying and capturing brown coking sediments and generating regulation and control information. According to the method, the brown coking sediments on the surface of the porous medium are recognized and captured by combining a high-speed camera shooting technology, when the sediments are increased and the color is deepened, the flow is instantly increased to burst through the air blockage phenomenon generated by a micro-scale flow channel due to the phase change process, then the flow is recovered, accurate regulation and control of the flow are achieved, and the working efficiency is improved. Therefore, the performance reduction of the cooling channel during long-time heat exchange is inhibited.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental devices, and in particular to a phase change sweating cooling system and a control method based on targeted dynamic tracking technology. Background Art

[0002] In recent years, transpiration cooling technology has attracted widespread attention as a novel active cooling technology applicable to small spaces. It can meet the development needs of lightweight and high-efficiency thermal management systems during hypersonic flight. However, under the influence of uneven aerodynamic heat and mechanical loads, the cooling effect of the transpiration porous medium matrix is ​​uneven, reducing the heat absorption efficiency of the transpiration coolant and significantly affecting the operating performance of aircraft engines under extreme operating conditions. During the flow and heat exchange of liquids within micron-scale porous media, boiling mass transfer occurs, inducing the generation, migration, and convergence of bubbles. This can cause gas blockage and localized evaporation in extremely narrow areas within the porous medium, as well as cooling hysteresis and temperature fluctuations on the porous medium surface. These phenomena can lead to structural failure and deteriorate the performance of hypersonic vehicles.

[0003] At present, brown thermal oxidation structural coke deposits have been found on the surface of porous materials during the sweating cooling process, indicating that carbon deposition has occurred in the hydrocarbon fuel. As the heat flow at the front end increases and the temperature increases, carbon deposition is more likely to occur upstream of the porous material. Summary of the Invention

[0004] The present invention aims to solve the problem in the prior art of decreased local cooling performance due to uneven flow and heat exchange of porous media, and further proposes a phase change sweating cooling system and a control method based on targeted dynamic tracking technology.

[0005] The technical solution adopted by the present invention to solve the above problems is:

[0006] The present invention comprises:

[0007] A high-temperature gas generation module, used for providing high-temperature airflow to the sweat cooling test module;

[0008] The sweat cooling test module is connected to the high temperature gas generation module upstream and the cooler downstream.

[0009] A coolant supply module, configured to supply coolant to the sweat cooling test module;

[0010] A dynamic tracking module is used to identify and capture the brown coking deposits formed by the sweat cooling test module and generate regulatory information.

[0011] Furthermore, the high-temperature gas generation module includes a compressed gas supply system, a fuel atomization system, a combustion chamber, an ignition device, a rectifier and a loop pipe. The output end of the compressed gas supply system is connected to the air inlet of the combustion chamber through a pipe; the output end of the fuel atomization system is connected to the inlet end of the combustion chamber; the combustion chamber receives the mixed gas and ignites it through the ignition device to generate high-temperature gas; the inlet end of the rectifier is connected to the outlet end of the combustion chamber; the outlet end of the rectifier is connected to the sweating cooling test module through a loop pipe.

[0012] Furthermore, the sweating cooling test module includes an experimental section, a liquid collecting channel, a sweating cooling cavity, an insulation board, a porous medium matrix and a visual observation window. The inlet end of the experimental section is connected to the outlet end of the rectifier through a loop pipe; a visual observation window is provided on the top of the experimental section, the upper part of the porous medium matrix is ​​located in the experimental section, the sweating cooling cavity is located below the porous medium matrix and is connected thereto, the insulation board is surrounded by the outer walls of the sweating cooling cavity and the porous medium matrix, and is fixedly connected to the bottom wall of the experimental section, and the coolant supply module is used to supply coolant to the sweating cooling cavity.

[0013] Furthermore, the coolant supply module includes a liquid storage tank, a switching valve, a peristaltic pump, a flow control valve, a flow meter and a liquid collection channel, the liquid storage tank and the peristaltic pump are fixedly connected; a switching valve is provided on the pipeline between the liquid storage tank and the peristaltic pump; the liquid collection channel passes through the insulation board and supplies coolant to the sweating cooling cavity; a flow control valve and an electromagnetic flow meter are provided on the pipeline connecting the peristaltic pump and the liquid collection channel.

[0014] Furthermore, the dynamic tracking module includes: a high-speed camera, a photosensor, a photoelectric signal converter and a signal synchronization controller. The three high-speed cameras are placed independently of each other and are located at the upper part of the visual observation window. The signal output end of the high-speed camera is connected to the signal input end of the photoelectric signal converter, and the image signal is output to the signal converter; the signal output end of the photosensor is connected to the signal input end of the photoelectric signal converter, and the photoelectric signal converter converts the image signal of the high-speed camera and the light signal of the photosensor into electrical signals, which are transmitted to the computer. The computer generates flow control instructions and sends them to the signal synchronization controller.

[0015] Furthermore, a plurality of thermocouples are welded to the upper surface of the porous medium matrix.

[0016] Furthermore, the porous medium matrix is ​​formed by pressing and sintering copper alloy particles in a mold.

[0017] Furthermore, the upper surface of the porous medium matrix is ​​a planar structure, and the lower surface is provided with an inclined surface with an adjustable slope.

[0018] Furthermore, the high-speed camera is respectively aimed at the front end, middle end and rear end of the porous medium matrix 18 .

[0019] Furthermore, the waste liquid outlet of the cooler is connected to a waste liquid tower.

[0020] The present invention also provides a modulation method of a phase change sweating cooling system based on targeted dynamic tracking technology, comprising the following steps:

[0021] Step 1: Pre-fill the cooling liquid cavity with coolant and continuously supply flow to the sweating cooling liquid cavity through the liquid collecting channel; turn on the compressed gas supply system and check the air tightness of the gas pipeline; turn on the high-speed camera and photosensor, start the computer, signal synchronization controller and flow control valve, and check whether the photoelectric signals of the photoelectric signal converter and the signal synchronization controller are normal.

[0022] Step 2: Turn on the fuel atomization system and ignition device, ignite the fuel in the combustion chamber, and pass the high-temperature gas generated by the combustion in the combustion chamber into the experimental section after eliminating the swirl through the rectifier; open the on-off valve, run the peristaltic pump, set the initial flow opening, and use an electromagnetic flowmeter to test the coolant flow; conduct water and kerosene experiments: initially conduct water experiments, and do not need to pay attention to the coking phenomenon on the surface of the porous medium matrix during the process; when conducting kerosene experiments, monitor the coking deposition, and the subsequent steps will use kerosene as an example;

[0023] Step 3: After the high-temperature gas and coolant flow reach a thermal equilibrium state, a high-speed camera is started to capture the coking state on the porous medium substrate surface, with a capture time of seconds per frame; the surface temperature of the porous medium is recorded in real time using a thermocouple; the image color difference is analyzed by a computer to identify the darkening of the coked area, and the flow control valve opening is instantaneously increased through a signal synchronization controller to restore the original flow rate after the gas blockage is cleared;

[0024] Step 4: Replace the porous medium matrix with different slopes and repeat the above steps. The larger the slope, the more significant the difference in flow between the hot end and the cold end. Analyze the temperature difference of the thermocouple along the airflow direction. The larger the temperature difference, the better the phase change heat absorption effect.

[0025] Step 5: Turn off the ignition device and fuel atomization system, stop fuel injection, continue to introduce cooling air, clean residual fuel and cool down; turn off the compressed gas supply system, stop the peristaltic pump, cut off the coolant supply, and the test is complete.

[0026] The beneficial effects of the present invention are:

[0027] 1. The present invention combines high-speed camera technology to identify and capture brown coking deposits on the surface of porous media. When the deposits increase and the color deepens, the flow rate is instantly increased to break the air blockage caused by the micro-scale flow channel due to the phase change process. The flow rate is then restored to achieve precise control of the flow rate, thereby suppressing the performance degradation of the cooling channel during long-term heat exchange, and solving the problem of local cooling performance degradation caused by the flow and heat exchange unevenness of the porous medium in previous studies.

[0028] 2. The present invention proposes a porous medium structure design with variable slope. When the flow rate of the liquid collection passage is given and the liquid fills the sweating cooling cavity, the distance between the porous medium microscale flow channels at the upstream hot end is small, and the local flow resistance is small, so that a larger microporous channel flow coolant supply can be achieved at the local high heat load. At the downstream cold end, the radial length of the porous channel is increased, and the flow resistance is greater, so a smaller flow coolant supply can be achieved at the low heat load at the tail end, thereby realizing self-driven flow control during the phase change sweating cooling process.

[0029] 3. The present invention can control the coolant supply flow rate, change the slope of the porous medium matrix, match the heat flow wind speed, and realize dynamic observation of wall coking. This targeted dynamic capture system can identify the color changes in the front, middle and rear sections of the cooling position, and provide a phase change sweating cooling control strategy under the coordinated matching control of the coolant supply flow rate.

[0030] 4. In the present invention, each module is independent of each other, the system structure is stable, and the heat absorption efficiency and cooling performance of the phase change transpiration cooling system are improved. The device can operate for a long time, providing a theoretical and experimental basis for improving the life, reliability, operability and stability of the main engine of the hypersonic aircraft. By synergistically matching multiple parameters, the flow rate, coking amount and temperature curve drawing under all working conditions can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 Schematic diagram of the structure of the porous medium matrix of the present invention;

[0033] Figure 3 This is a specific cross-sectional distribution diagram of the porous medium matrix of the present invention.

[0034] In the figure, 1. Compressed gas supply system; 2. Fuel atomization system; 3. Combustion chamber; 4. Ignition device; 5. Rectifier; 6. Loop pipe; 7. Experimental section; 8. Cooler; 9. Waste liquid tank; 10. Liquid storage tank; 11. Switch valve; 12. Peristaltic pump; 13. Flow control valve; 14. Flow meter; 15. Liquid collecting channel; 16. Transpiration cooling cavity; 17. Heat insulation board; 18. Porous medium matrix 1; 19. Visual observation window; 20, 21, 22 high-speed cameras; 25, 26 photosensors; 21, 23 photoelectric signal converters; 28 signal synchronization controller. DETAILED DESCRIPTION

[0035] Specific implementation method 1: Combination Figures 1 to 3 This embodiment describes a phase change sweating cooling system based on targeted dynamic tracking technology, including:

[0036] A high-temperature gas generation module, used for providing high-temperature airflow to the sweat cooling test module;

[0037] The sweating cooling test module is connected upstream to the high-temperature gas generation module and downstream to cooler 8, whose waste liquid outlet is connected to waste liquid tower 9. Cooler 8 is used to cool the high-temperature gas flow, releasing heat to convert some of the gas into liquid. Waste liquid tower 9 is used to store the gas-liquid mixture.

[0038] A coolant supply module, configured to supply coolant to the sweat cooling test module;

[0039] The dynamic tracking module is used to capture coking deposits on the surface of the porous medium matrix 18 and generate control information.

[0040] like Figure 1 As shown, the high-temperature gas generation module includes a compressed gas supply system 1, a fuel atomization system 2, a combustion chamber 3, an ignition device 4, a rectifier 5, and a loop pipe 6. The output end of the compressed gas supply system 1 is connected to the air inlet of the combustion chamber 3 through a pipe; the output end of the fuel atomization system 2 is connected to the inlet end of the combustion chamber 3; the combustion chamber 3 receives the mixed gas and ignites it through the ignition device 4 to generate high-temperature gas; the inlet end of the rectifier 5 is connected to the outlet end of the combustion chamber 3 to stabilize the airflow; the outlet end of the rectifier 5 is connected to the experimental section 7 through the loop pipe 6. The compressed gas supply system 1 provides a stable airflow, the fuel atomization system 2 and the combustion chamber 3 generate high-temperature gas, the rectifier 5 eliminates airflow vortices, and the compressed gas supply system 1 realizes a stable flow and pressure supply of air. The atomized fuel is ignited in the ignition device to generate water vapor and carbon dioxide. Therefore, the main components of the gas include nitrogen, water vapor and carbon dioxide. The gas temperature in the experimental section is 500-700K, and the incoming gas velocity in the experimental section is controlled at 20-50m / s. After passing through the rectifier 5, the gas vortices and unstable disturbances in the tube are weakened.

[0041] like Figure 1 As shown, the sweating cooling test module includes an experimental section 7, a liquid collecting channel 15, a sweating cooling cavity 16, a heat insulation board 17, a porous medium matrix 18 and a visual observation window 19. The experimental section 7 adopts a rectangular hollow structure, which is connected to the high-temperature gas generation module upstream and the cooler 8 downstream; a visual observation window 19 is provided on the top of the experimental section 7, the upper part of the porous medium matrix 18 is located in the experimental section 7, the sweating cooling cavity 16 is located below the porous medium matrix 18 and is connected thereto, and the heat insulation board 17 surrounds the outer wall of the sweating cooling cavity and the porous medium matrix 18, and is fixedly connected to the bottom wall of the experimental section 7 to reduce heat loss;

[0042] The visual observation window 19 is embedded in the top opening of the experimental section 7 and is made of high-temperature resistant glass. It faces the upper surface of the porous medium matrix 18 and is used for shooting by high-speed cameras 20, 22, and 24.

[0043] The upper surface of the porous medium matrix 18 is welded with thermocouples 29 for measuring temperature. There are 10 thermocouples 29 , which are arranged in pairs to measure the temperature change at the center line.

[0044] The porous medium matrix 18 is rigidly fixed to the inner wall of the heat insulation board 17. It is made of copper alloy particles pressed and sintered in a mold. Figure 2 As shown, the porous medium matrix 18 consists of two parts. The upper part is a rectangular structure with a flat upper surface, which directly contacts the high-temperature airflow in experimental section 7. The lower part has a right-angled trapezoidal cross-section, and the lower surface of the trapezoidal structure is an inclined surface with adjustable slope. The waist and the lower base are arranged at different angles, resulting in short microporous channels at the upstream (hot end) and long microporous channels at the downstream (cold end). Given a given flow rate in the liquid collection passage 15 and liquid filling the transpiration cooling cavity, the smaller distance between the porous medium microscale flow channels at the upstream hot end and the lower local flow resistance allow for a larger microporous channel flow rate of coolant to be supplied at the local high heat load. At the downstream cold end, the radial length of the porous channels increases, resulting in greater flow resistance, allowing for a smaller flow rate of coolant to be supplied at the tail end with lower heat load. The lower porous medium base is aligned with the heat flow direction, minimizing microscale flow phenomena. This ensures high transpiration cooling efficiency while further improving cooling performance, achieving self-driven flow control during phase change transpiration cooling.

[0045] like Figure 1 As shown, the coolant supply module includes a liquid storage tank 10, a peristaltic pump 12, a switch valve 11, a flow control valve 13, a flow meter 14 and a liquid collecting channel 15. The liquid storage tank 10 and the peristaltic pump 12 are fixedly connected; a switch valve 11 is provided on the pipeline between the liquid storage tank 10 and the peristaltic pump 12; the liquid collecting channel 15 passes through the insulation board 17 and supplies coolant to the sweating cooling cavity 16; a flow control valve 13 and an electromagnetic flowmeter 14 are provided on the pipeline connecting the peristaltic pump 12 and the liquid collecting channel 15, and the electromagnetic flowmeter 14 is used to measure the flow of the coolant.

[0046] The coolant medium is water and kerosene. The coolant is injected from below the porous medium matrix 18, and the high-temperature hot gas flows from above. The coolant flows through the curved channels between the solid particles to the upper surface of the porous medium matrix 18 until its temperature and pressure reach the required conditions and a phase change occurs. During the upward flow of the liquid, boiling heat transfer occurs, and the liquid evaporates to form steam. A clear gas-liquid interface exists between the liquid and vapor states, and the generated steam escapes from the porous material and flows into the mainstream gas. Along the mainstream direction, high-temperature and low-temperature zones with clear boundaries appeared successively on the upper surface of the porous medium matrix 18, that is, the air blocking phenomenon occurred in the phase change sweating cooling. The air blocking phenomenon further enhanced the oxidation coking rate, and the sediment increased and the color deepened. The signal synchronization controller was controlled by the computer 27, and the control instruction was further transmitted to the flow control valve 13 to change the opening of the flow control valve 13, increase the instantaneous flow to break the air blocking phenomenon caused by the micro-scale flow channel caused by the phase change process, and then restore the flow. The electromagnetic flowmeter 14 records the flow change data to achieve precise control of the flow, thereby suppressing the performance degradation of the cooling channel during long-term heat exchange and the loss of flow under high flow.

[0047] like Figure 1 As shown, the dynamic tracking module includes: high-speed cameras 20, 22, 24, photosensors 25 and 26, photoelectric signal converters 21 and 23 and a signal synchronization controller 28. The three high-speed cameras 20, 22, and 24 are placed independently of each other and are located on the upper part of the visual observation window 19. They are respectively aimed at the front end, middle end and rear end of the porous medium matrix 18 to capture the surface coking image at a rate of 5-30 seconds / frame and output the image signal to the signal converters 21 and 23; the signal output ends of the photosensors 25 and 26 are connected to the signal input ends of the signal converters 21 and 23. The photosensors 25 and 26 are used to detect the light reflection characteristics ( Such as color difference in the coking area), output light signals to signal converters 21 and 23, signal converters 21 and 23 convert image signals of high-speed cameras 20, 22, 24 and light signals of photosensors 25 and 26 into electrical signals, and transmit them to computer 27. Computer 27 has built-in image recognition software, analyzes the color change of coking deposits, generates flow control instructions and sends them to signal synchronization controller 28. Signal synchronization controller 28 outputs control electrical signals with the instructions received from computer 27 to flow control valve 13. The flow control valve 13 is used to regulate the coolant flow, adjust the opening according to the electrical signal of signal synchronization controller 28, and change the coolant flow (such as instantaneously increasing the flow to suppress air blockage).

[0048] Specific embodiment 2: This embodiment provides a control method for a phase change sweating cooling system based on targeted dynamic tracking technology, including the following:

[0049] First, pre-fill the cooling liquid chamber 16 with coolant, continuously supply flow to the sweating cooling liquid chamber 16 through the liquid collecting channel 14, turn on the compressed gas supply system 1, so that the system can operate stably under the entire gas passage, check the air tightness of the base connections of each device, turn on the high-speed cameras 20, 22, and 24, turn on the photosensors 25 and 26, together with the computer 27, the signal synchronization controller 28 and the flow control valve 13, and check the photoelectric signals of the signal converter and the signal synchronization controller.

[0050] Next, turn on the fuel atomization system 2 and the ignition device 4, and ignite the fuel in the combustion chamber 3. The ignited gas in the combustion chamber 3 has swirls and unstable vortices. After passing through the rectifier 5, the smooth gas enters the experimental section. Synchronously, turn on the coolant supply system, open the switch valve 11, and run the peristaltic pump 12 to achieve stable and accurate supply of flow. At the beginning, set a certain opening of the flow opening valve. The coolant flow measurement is tested using an electromagnetic flowmeter 14. The experiment can first be carried out with water. During the water experiment, there is no need to pay attention to the coking phenomenon on the surface of the porous medium matrix. When conducting kerosene experiments, coking will occur. In the subsequent descriptions, kerosene is used as the coolant.

[0051] As the high-temperature hot air flows into experimental section 7, the system reaches thermal equilibrium before recording and recording temperature data. The photos taken by the three high-speed cameras are analyzed and processed by the image recognition software built into computer 27. The local color difference and contrast of the before and after photos are examined. If the color of a local location is abnormally darkened, it indicates that the phase change sweating cooling caused by air blockage in the micro-scale channel is hindered, and the oxidation and coking rate is accelerated. Therefore, the computer 28 sends an electrical signal to the flow control valve 13 connected to the signal synchronization controller 28, thereby changing the coolant flow rate, instantaneously increasing the flow rate to clear the air blockage in the micro-scale flow channel caused by the phase change process. The flow rate is then restored, achieving precise flow control, thereby suppressing the performance degradation of the cooling channel during long-term heat exchange.

[0052] The experiment was carried out by selecting different porous medium matrices 18 in turn. The greater the slope of the matrix, the greater the difference in micro-scale flow rate between the hot end and the cold end. The lower part of the porous medium matrix was a rectangular structure as a control group. In the experiment, the cooling performance was tested by the temperature of the thermocouple 29 on the surface of the porous medium matrix 18. Along the flow direction, the greater the temperature difference, the greater the heat absorption in the phase change process, and the better the cooling effect.

[0053] After data collection is completed, ignition and fuel injection are stopped, followed by gas supply, and cooling air is continuously blown in to cool down and remove residual fuel in the channel; finally, compressed gas system 1 is turned off, coolant injection is stopped, and the test ends.

[0054] This system aims to propose a phase change sweating cooling system and control method based on targeted dynamic tracking technology. By identifying and capturing brown coke deposits on the surface of the porous medium, and then synergistically matching and adjusting the coolant supply flow, the growth of brown coke can be inhibited and the cooling performance can be improved, breaking through the difficulty of local cooling performance degradation caused by the unevenness of the porous medium in previous studies; in addition, the newly designed variable-slope porous medium structure in the present invention can achieve a larger flow rate of coolant supply at local high heat loads and a smaller flow rate of coolant supply at the tail end with low heat loads, thereby realizing self-driven flow control during phase change sweating cooling.

[0055] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. Phase change sweat cooling system based on targeted dynamic tracking technology, characterized by: include: A high-temperature gas generation module, used for providing high-temperature airflow to the sweat cooling test module; The sweating cooling test module is connected to the high temperature gas generation module upstream and the cooler (8) downstream. A coolant supply module, configured to supply coolant to the sweat cooling test module; A dynamic tracking module is used to identify and capture the brown coking deposits formed by the sweat cooling test module and generate regulatory information.

2. The phase change sweating cooling system based on targeted dynamic tracking technology according to claim 1 is characterized in that: The high-temperature gas generation module comprises a compressed gas supply system (1), a fuel atomization system (2), a combustion chamber (3), an ignition device (4), a rectifier (5) and a loop pipe (6), wherein the output end of the compressed gas supply system (1) is connected to the air inlet of the combustion chamber (3) through a pipe; the output end of the fuel atomization system (2) is connected to the inlet end of the combustion chamber (3); the combustion chamber (3) receives the mixed gas and ignites it through the ignition device (4) to generate high-temperature gas; the inlet end of the rectifier (5) is connected to the outlet end of the combustion chamber (3); and the outlet end of the rectifier (5) is connected to the sweating cooling test module through the loop pipe (6).

3. The phase change sweating cooling system based on targeted dynamic tracking technology according to claim 2 is characterized in that: The sweating cooling test module comprises an experimental section (7), a liquid collecting channel (15), a sweating cooling cavity (16), a heat insulation board (17), a porous medium matrix (18) and a visual observation window (19). The inlet end of the experimental section (7) is connected to the outlet end of the rectifier (5) through a loop pipe (6); a visual observation window (19) is provided on the top of the experimental section (7); the upper part of the porous medium matrix (18) is located in the experimental section (7); the sweating cooling cavity (16) is located below the porous medium matrix (18) and is connected thereto; the heat insulation board (17) surrounds the outer walls of the sweating cooling cavity (16) and the porous medium matrix (18) and is fixedly connected to the bottom wall of the experimental section (7); and the coolant supply module is used to supply coolant to the sweating cooling cavity (16).

4. The phase change sweating cooling system based on targeted dynamic tracking technology according to claim 3 is characterized in that: The coolant supply module comprises a liquid storage tank (10), a switch valve (11), a peristaltic pump (12), a flow control valve (13), a flow meter (14) and a liquid collection channel (15); the liquid storage tank (10) and the peristaltic pump (12) are fixedly connected; a switch valve (11) is provided on the pipeline between the liquid storage tank (10) and the peristaltic pump (12); the liquid collection channel (15) penetrates the heat insulation board (17) and supplies coolant to the sweating cooling cavity (16); and a flow control valve (13) and an electromagnetic flow meter (14) are provided on the pipeline connecting the peristaltic pump (12) and the liquid collection channel (15).

5. The phase change sweating cooling system based on targeted dynamic tracking technology according to claim 1 is characterized in that: The dynamic tracking module includes: high-speed cameras (20, 22, 24), photosensors (25, 26), photoelectric signal converters (21, 23) and a signal synchronization controller (28). The three high-speed cameras (20, 22, 24) are placed independently of each other and are all located on the upper part of the visual observation window (19). The signal output ends of the high-speed cameras (20, 22, 24) are connected to the signal input ends of the photoelectric signal converters (21, 23); the signal output ends of the photosensors (25, 26) are connected to the signal input ends of the photoelectric signal converters (21, 23). The photoelectric signal converters (21, 23) convert the image signals of the high-speed cameras (20, 22, 24) and the optical signals of the photosensors (25, 26) into electrical signals, which are transmitted to the computer (27). The computer (27) generates a flow control instruction and sends it to the signal synchronization controller (28).

6. The phase change sweating cooling system based on targeted dynamic tracking technology according to claim 3 is characterized in that: A plurality of thermocouples (29) are welded to the upper surface of the porous medium matrix (18).

7. The phase change sweating cooling system based on targeted dynamic tracking technology according to claim 6, characterized in that: The porous medium matrix (18) is formed by pressing and sintering copper alloy particles in a mold.

8. The phase change sweat cooling system based on targeted dynamic tracking technology according to claim 7, characterized in that: The upper surface of the porous medium matrix (18) is a plane structure, and the lower surface is provided with an inclined surface with an adjustable slope.

9. The phase change sweating cooling system based on targeted dynamic tracking technology according to claim 5, characterized in that: The waste liquid outlet of the cooler (8) is connected to a waste liquid tower (9).

10. A modulation method for a phase change sweat cooling system based on targeted dynamic tracking technology, characterized in that: The steps include: Step 1: pre-fill the cooling liquid chamber (16) with coolant, and continuously supply flow to the sweating cooling liquid chamber (16) through the liquid collecting channel (15); start the compressed gas supply system (1) and check the air tightness of the gas pipeline; start the high-speed camera (20, 22, 24) and the photosensor (25, 26), start the computer (27), the signal synchronization controller (28) and the flow control valve (13), and check whether the photoelectric signals of the photoelectric signal converter (21, 23) and the signal synchronization controller (28) are normal. Step 2: Turn on the fuel atomization system (2) and the ignition device (4), ignite the fuel in the combustion chamber (3), and the high-temperature gas generated by the combustion in the combustion chamber (3) passes through the rectifier (5) to eliminate the swirl and then enters the experimental section (7); open the switch valve (11), run the peristaltic pump (12), set the initial flow opening, and use the electromagnetic flowmeter (14) to test the coolant flow; conduct water experiments and kerosene experiments: initially conduct water experiments, and during the process, there is no need to pay attention to the coking phenomenon on the surface of the porous medium matrix; when conducting the kerosene experiment, monitor the coking deposition, and the subsequent steps take kerosene as an example; Step 3: After the high-temperature gas and the coolant flow reach a thermal equilibrium state, the high-speed camera (20, 22, 24) is started to shoot the coking state on the surface of the porous medium substrate (18), with a shooting time of 5-30 seconds per frame; the surface temperature of the porous medium is recorded in real time by a thermocouple (29); the image color difference is analyzed by a computer (27), and the color of the coked area is identified to be darker, and the opening of the flow control valve (13) is instantaneously increased by a signal synchronization controller (28), and the original flow rate is restored after the gas blockage is cleared; Step 4: Replace the porous medium matrix (18) with a different slope and repeat the above steps. The greater the slope, the more significant the difference in flow between the hot end and the cold end. Analyze the temperature difference of the thermocouple (29) along the airflow direction. The greater the temperature difference, the better the phase change heat absorption effect. Step 5: Turn off the ignition device (4) and the fuel atomization system (2), stop fuel injection, continue to introduce cooling air, clean the residual fuel and cool down; turn off the compressed gas supply system (1), stop the peristaltic pump (12), cut off the coolant supply, and the test ends.

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