Adjustable sweating cooling effect test system and test method thereof

Abstract

The application discloses a kind of adjustable perspiration cooling effect test system and its test method.A kind of adjustable perspiration cooling effect test system, including a liquid supply mechanism, liquid supply mechanism includes microsyringe pump, tee joint and liquid supply pipeline, the outlet of microsyringe pump is respectively connected with liquid supply pipeline and pressure sensor through tee joint;It further includes the first experimental fixture suitable for sheet test piece and the second experimental fixture suitable for block test piece;It further includes an infrared heating lamp for providing heat to test piece, a homogenizing sheet is installed between the infrared heating lamp and the first experimental fixture, and a plano-convex lens is installed between the infrared heating lamp and the second experimental fixture;It further includes an infrared thermal imager for collecting the surface temperature of test piece and a thermocouple assembly for collecting the internal temperature of test piece.The application provides different experimental fixtures for different sizes to meet the perspiration cooling test requirements of different products.

Description

Technical Field

[0001] The present invention relates to the technical field of material testing, and in particular to a sweating cooling testing device and method. Background Art

[0002] Transpiration cooling is a highly efficient cooling method. As the liquid coolant flows through microporous channels, it absorbs heat and undergoes a phase change, significantly improving cooling efficiency. Therefore, developing efficient transpiration cooling methods could help improve the thermal management performance of hypersonic vehicles, thereby ensuring their safety and reliability under extreme flight conditions. However, transpiration cooling currently faces several challenges, primarily insufficient structural strength and difficulties in integration. Currently, research on channel-porous medium integration and the integration of additive manufacturing with transpiration cooling is lacking.

[0003] Current testing systems for transpiration cooling primarily focus on devices designed for devices with fixed sizes and shapes. Chinese Patent Publication No. CN115901846A discloses a transpiration cooling test device and method. This patent allows for the use of porous media plates more closely aligned with engine applications, allowing for partial transpiration cooling of the same porous media plate through a cooling medium. Simultaneous experiments with transpiration cooling using different cooling media and non-transpiration cooling can also be performed, providing effective support for theoretical research on the application of different transpiration cooling methods within the engine field. However, this device requires individual design for different transpiration sizes, limiting its applicability. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present invention provides an adjustable sweating and cooling effect testing system and a testing method thereof, which have solved at least one of the above technical problems.

[0005] The technical solution of the present invention is: an adjustable sweating cooling effect testing system, characterized by comprising a liquid supply mechanism, the liquid supply mechanism comprising a micro-injection pump, a three-way connector, and a liquid supply pipeline, the outlet of the micro-injection pump being connected to the liquid supply pipeline and the pressure sensor respectively through the three-way connector;

[0006] Also included is a first experimental fixture suitable for sheet-shaped test pieces and a second experimental fixture suitable for block-shaped test pieces;

[0007] The first experimental fixture includes a first base, a liquid supply vertical tube, and a supporting member. The bottom of the first base is detachably connected to the liquid supply pipeline. The bottom of the liquid supply vertical tube is plugged into the first base and connected to the liquid supply pipeline. The top of the liquid supply vertical tube is plugged into the supporting member. The supporting member includes a sheet-shaped test piece, a gasket, and a heat insulation sheet adhesively connected from top to bottom. The top of the liquid supply vertical tube is connected to the bottom of the sheet-shaped test piece.

[0008] The second experimental fixture includes a second base, a heat-insulating cover, and a reflective film. The second base is provided with a mounting groove for embedding the block test piece. The mounting groove and the block test piece are sealed with a sealant. The bottom of the base is provided with a docking hole for docking the liquid supply pipeline and the bottom of the block test piece.

[0009] The heat-insulating cover is sleeved on the outer periphery of the second base, and an exposure opening is formed on the heat-insulating cover for exposing the upper surface of the block test piece. The rest of the heat-insulating cover except the exposure opening is covered with the reflective film;

[0010] It also includes an infrared heating lamp for providing heat to the test piece, a light homogenizer is installed between the infrared heating lamp and the first experimental fixture, and a plano-convex lens is installed between the infrared heating lamp and the second experimental fixture;

[0011] It also includes an infrared thermal imager for collecting the surface temperature of the test piece and a thermocouple assembly for collecting the internal temperature of the test piece. The thermocouple assembly includes a first thermocouple for sensing the temperature at different radial positions on the bottom of the sheet test piece and a second thermocouple for sensing the longitudinal temperature at different thickness positions of the block test piece.

[0012] This invention provides different experimental fixtures of different sizes to meet the sweat cooling test requirements of different products. For sheet-shaped test pieces (larger test pieces), a uniform heat flow is achieved by using a homogenizer, while for block-shaped test pieces (smaller test pieces), a plano-convex lens is used for focusing.

[0013] Further preferably, the gasket is provided with a through hole for passing a first thermocouple, and the first thermocouple is used to abut against the bottom of the sheet-like test piece.

[0014] Further preferably, the gasket is provided with four circumferentially arranged perforation groups, and each perforation group is provided with the perforations extending radially outward from a side adjacent to the docking hole to a side away from the docking hole.

[0015] It is convenient to select the average value of two test points at the same radial position to align the temperature value at the current radial position.

[0016] Further preferably, a through hole is longitudinally provided on the side wall of the block-shaped test piece for passing a second thermocouple, and the second thermocouple is used to abut against the side wall of the block-shaped test piece.

[0017] It is convenient to select the average value of two test points at the same thickness position to align the temperature value at the current thickness position.

[0018] More preferably, it further comprises an integrated frame, on which the infrared thermal imager, the infrared heating lamp, the microinjection pump, the three-way connector and the pressure sensor are installed;

[0019] The first experimental jig and the second experimental jig can be detachably switched under the infrared heating lamp.

[0020] Further preferably, the first experimental fixture includes a first lifting platform, the first base is installed on the first lifting platform, a first telescopic frame is installed on the first lifting platform, and the first telescopic frame is detachably connected to the light homogenizer;

[0021] The second experimental fixture includes a second lifting platform, the second base is installed on the second lifting platform, a second telescopic frame is installed on the second lifting platform, and the second telescopic frame is detachably connected to the plano-convex lens.

[0022] Further preferably, the diameter of the plano-convex lens is 50 mm, the upper side of the plano-convex lens is a plane, the lower side of the plano-convex lens is a convex surface, and the thickness of the plano-convex lens at its maximum thickness is 19.2 mm;

[0023] The diameter of the light homogenizer is 50 mm, and the light homogenizer is double-sided frosted glass with a roughness of 1500 mesh and a thickness of 2 mm.

[0024] Further preferably, the three-way joint is connected to the liquid supply pipeline through a pagoda head and sealed with raw tape; the three-way joint is connected to the pressure sensor through threads and sealed with raw tape; the first base and the second base are both connected to the liquid supply pipeline through M6 threads, and the interface is sealed with raw tape.

[0025] A method for testing an adjustable sweating and cooling effect testing system, comprising the following steps:

[0026] Step 1: Determine whether to select the first experimental fixture or the second experimental fixture according to the size of the test piece to fix and assemble the test piece;

[0027] Step 2: Turn on the infrared heating lamp to heat the area where the test piece is located;

[0028] Step 3: When the temperature difference detected by the thermocouple assembly and the infrared thermal imager is less than 1°C, the microinjection pump is turned on to inject water, and the infrared thermal imager is used to collect the surface temperature and perform real-time surface temperature data monitoring; the thermocouple assembly is used to monitor the internal temperature data of the test piece; and the pressure sensor is used to monitor the pressure at the inlet of the test piece in real time;

[0029] The computer stores the data collected by the pressure sensor, the infrared thermal imager and the thermocouple assembly.

[0030] The evaluation index is mainly the temperature during quantitative liquid supply. The lower the temperature, the better the sweating cooling effect.

[0031] Further preferably, in step 3, the acquisition frequency of the infrared thermal imager is 50 Hz, that is, the temperature data can be collected 50 times per second;

[0032] Twenty-two first thermocouples are connected to the first experimental fixture. The twenty-two first thermocouples are grouped in pairs for detecting the temperature value at the same radial position. The average of the two temperature values ​​at the same radial position is the temperature value at the current radial position.

[0033] The second experimental fixture is connected to eight second thermocouples. The eight second thermocouples are grouped in pairs to detect the temperature value at the same thickness position. The average of the two temperature values ​​at the same thickness position is the temperature value at the current thickness position.

[0034] The output signal of the pressure sensor is 0-10V, and data is collected every 1s.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention can perform heating tests on sweat cooling test pieces of various shapes and sizes, can collect data such as temperature reflecting the cooling effect and pressure reflecting the flow effect in real time, and can compare and analyze the sweat cooling performance of different test pieces.

[0037] This method combines surface infrared detection with thermocouple detection to systematically demonstrate the effectiveness of sweating and cooling. In the example test pieces, both the horizontal and vertical temperature of sheet-like test pieces (larger sheets) and block-like test pieces (smaller sheets) can be monitored, achieving comprehensive data monitoring and avoiding the significant errors associated with a single variable. Furthermore, surface phase changes during sweating can be intuitively monitored.

[0038] This invention utilizes a plano-convex lens and a homogenizer to achieve sweating tests on a wide range of test specimens. For sheet-shaped specimens (larger specimens), a homogenizer is primarily used to achieve uniform heat flux and maintain a large heating area. For block-shaped specimens (smaller specimens), a plano-convex lens is primarily used for focusing. The power supply can also be used to adjust the overall power, thereby enabling the heat flux density to be varied within a given heating range.

[0039] This invention significantly reduces experimental and production costs. By combining infrared lamp heating with surface infrared detection and thermocouple testing, it reduces reliance on expensive equipment such as wind tunnels, making the overall system more economical and practical. Furthermore, the ability to conduct real-time monitoring and data analysis reduces material waste caused by errors during testing, further improving economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a structural diagram of a specific embodiment 1 of the present invention;

[0041] Figure 2 This is a structural schematic diagram of the first experimental fixture of specific embodiment 1 of the present invention;

[0042] Figure 3 This is a schematic diagram of the partial structure of the first experimental fixture in specific embodiment 1 of the present invention;

[0043] Figure 4 This is a schematic diagram of the partial structure of the first experimental fixture in specific embodiment 1 of the present invention;

[0044] Figure 5 This is a structural schematic diagram of the first base of the first experimental fixture in specific embodiment 1 of the present invention;

[0045] Figure 6 This is a structural schematic diagram of the first base of the first experimental fixture in specific embodiment 1 of the present invention from another perspective;

[0046] Figure 7 This is a structural schematic diagram of the second experimental fixture of specific embodiment 1 of the present invention;

[0047] Figure 8 This is a structural schematic diagram of the second experimental fixture in specific embodiment 1 of the present invention from another perspective;

[0048] Figure 9 This is an exploded view of the second experimental fixture of specific embodiment 1 of the present invention;

[0049] Figure 10 This is an exploded view of the second experimental fixture of specific embodiment 1 of the present invention;

[0050] Figure 11 This is a structural schematic diagram of the second base and the block-shaped test piece of the second experimental fixture in specific embodiment 1 of the present invention.

[0051] In the figure, 1: computer; 3: data acquisition instrument; 4: power supply; 5: plano-convex lens; 6: infrared heating lamp; 7: first experimental fixture; 8: second experimental fixture; 9: homogenizer; 10: liquid supply pipeline; 12: pressure sensor; 13: three-way connector; 15: micro-injection pump; 18: infrared thermal imager; 19: optical fiber.

[0052] 71: Block test piece; 73: Reflective film; 74: Insulation cover; 75: Block test piece; 76: Second base;

[0053] 81: first base; 82: sheet test piece; 83: gasket; 83: liquid supply vertical pipe; 85: thermal insulation sheet. DETAILED DESCRIPTION

[0054] See also Figures 1 to 11 Specific embodiment 1, an adjustable sweating cooling effect testing system, includes a liquid supply mechanism, a pressure sensor 12, a first experimental fixture 7 suitable for sheet test pieces, a second experimental fixture 8 suitable for block test pieces, an infrared heating lamp 6 for providing heat to the test pieces, a thermocouple assembly for measuring the internal temperature of the test pieces, and an infrared thermal imager for measuring the surface temperature of the test pieces. The thermocouple assembly includes a first thermocouple for sensing the temperature at different radial locations on the bottom of the sheet test piece 82, and a second thermocouple for sensing the temperature at different locations along the longitudinal direction of the block test piece.

[0055] The block-shaped test piece 71 and the sheet-shaped test piece 82 are both made of porous media.

[0056] The thickness of the sheet heater is less than that of the bulk test piece. The thickness of the sheet test piece is less than 5 mm. The thickness of the sheet test piece is less than the radial length of the sheet test piece. The thickness of the bulk test piece is not less than the radial length of the bulk test piece. Sheet test piece 82 can be a larger test piece with a heating requirement of 30 mm in diameter. Bulk test piece 71 can be a focused heating element measuring 10 mm x 10 mm x 10 mm.

[0057] The liquid supply mechanism includes a microinjection pump 15, a three-way connector 13 and a liquid supply line. The outlet of the microinjection pump 15 is connected to the liquid supply line and the pressure sensor 12 through the three-way connector 13. The microinjection pump 15 is connected to the three-way connector 13 through a pipeline. The inner diameter of the pipeline and the liquid supply line 10 is 4mm and the outer diameter is 6mm. It can realize timed and quantitative liquid supply, is equipped with a screen for parameter setting, and is operated by a screw rod and a stepper motor to achieve adjustment from low flow to high flow. Each outlet of the three-way connector 13 is M20, connected to the liquid supply line 10 through a pagoda head, and the pressure sensor 12 is directly connected to the three-way connector 13. The connection method is all threaded connection, which can ensure the water sealing effect.

[0058] The first experimental fixture 7 includes a first base 81, a liquid supply riser 84, and a support. The bottom of the first base 81 is detachably connected to the liquid supply line. The bottom of the liquid supply riser 84 is plugged into the first base 81 and connected to the liquid supply line. The top of the liquid supply riser 84 is plugged into the support. The support includes a sheet test piece, a gasket 83, and a thermal insulation sheet 85 adhesively connected from top to bottom. The top of the liquid supply riser 84 is connected to the bottom of the sheet test piece 82. The gasket 83 is provided with a perforation for passing the first thermocouple, which is used to abut the bottom of the sheet test piece 82. The gasket 83 is provided with four circumferentially arranged perforation groups, each of which has perforations extending radially outward from the side adjacent to the docking hole to the side away from the docking hole. This facilitates the selection of the average value of two test points at the same radial position to align with the temperature value at the current radial position. In the same radial direction, the spacing between adjacent first thermocouples is equal, with a spacing of 1mm-3mm. The material of the thermal insulation sheet 85 is vacuum silicon thermal insulation cotton. The first base 81 is a ceramic base. The first base 81 is provided with an opening for the first thermocouple lead to extend out and pass through longitudinally. The gasket can be a ceramic gasket. Preferably, it is a gasket with a relatively low thermal conductivity. It plays a role in preventing heat loss. The lower side and outer circumference of the sheet test piece are sealed by sealant, and the sealant is used to ensure the sealing of the joint between the liquid supply vertical pipe and the bottom of the sheet test piece. The sealant does not seal the top surface of the test piece.

[0059] The second experimental fixture 8 comprises a second base 76, an insulation cover 74, and a reflective film 72. The second base 76 has a mounting slot for inserting the block test piece, which is sealed to the block test piece with sealant. The bottom of the base has docking holes for connecting the liquid supply line and the bottom of the block test piece. The insulation cover 74 fits over the outer periphery of the second base 76 and has an opening for exposing the upper surface of the block test piece. The remaining area of ​​the insulation cover 74, excluding the opening, is covered with a reflective film 72. A longitudinal perforation is provided in the sidewall of the block test piece for the passage of a second thermocouple, which is positioned against the sidewall of the block test piece 71. This facilitates the selection of the average value of two test points at the same thickness position to align the temperature value at the current thickness position. Adjacent second thermocouples on the same side of the block test piece are spaced evenly in the longitudinal direction, with a spacing of 1 mm to 3 mm. The reflective film 72 is a tinfoil reflective film 72. The reflective film 72 can effectively prevent the infrared heating lamp 6 from applying heat to the non-sweating area, and the thermal insulation cover 74 is its thermal insulation layer, which can prevent heat loss. The thermal insulation cover 74 is a ceramic thermal insulation cover. The second base 76 is a ceramic base. According to the shape of the block test piece, a second base with different mounting slots is selected. The connection between the block test piece and the notch edge of the mounting slot is sealed with a sealant. The side wall of the block test piece located outside the mounting slot is also covered with sealant. The sealant does not block the top surface of the test piece.

[0060] The infrared heating lamp 6 is connected with the power supply 4, the lamp is 24V, 10A rated voltage and current, the highest power is 250W, the lamp port size is 50mm in diameter, multiple lamps can be used together to generate heat flow superposition effect, and a single lamp can be used to supply heat flow. The heat flow application mode is mainly electric heating conversion, which converts electric energy into infrared rays to apply to the surface of the sweating part to supply heat flow. The power supply 4 (the power supply 4 supplies 0-24V, 0-10A) is connected with the infrared heating lamp 6 and the pressure sensor 12, and provides power supply for them. The supply mode of the infrared heating lamp 6 is adjustable, the supply mode of the pressure sensor 12 is constant voltage supply, and multiple power supplies 4 can be used when multiple heating lamps are used together.

[0061] A light homogenizing sheet 9 is installed between the infrared heating lamp 6 and the first experimental fixture 7. The diameter of the light homogenizing sheet 9 is 50mm, the light homogenizing sheet 9 is double-sided frosted glass, the roughness is 1500 mesh, and the thickness is 2mm.

[0062] A plano-convex lens 5 is installed between the infrared heating lamp 6 and the second experimental fixture 8. The diameter of the plano-convex lens 5 is 50mm, the upper side of the plano-convex lens 5 is a plane, the lower side of the plano-convex lens 5 is a convex surface, and the thickness of the plano-convex lens 5 at the maximum thickness is 19.2mm.

[0063] The infrared thermal imager 18 is connected with the computer 1 through the optical fiber 19. The collection direction of the infrared thermal imager is towards the upper surface of the test piece. The temperature measurement range of the infrared thermal imager 18 is two grades, 0-300 DEG C and 300-1000 DEG C, which is used for real-time collection and storage of the surface temperature of the test piece, and can also be used for temperature tracking of fixed range or fixed point, tracking the temperature change in the sweating process. The surface temperature is generally the highest temperature during sweating cooling, so the temperature data collected by the infrared thermal imager 18 is the most important indicator of the sweating cooling measurement standard. When the infrared thermal imager 18 collects, the temperature performance of the sweating part surface can be recorded in real time.

[0064] The present application provides different sizes of experimental fixtures for experiments, which can meet the sweating cooling test requirements of different products. For the sheet-shaped test piece 82 (larger test piece), the light homogenizing sheet 9 is mainly used to make the heat flow uniform and maintain a larger heating area; for the block-shaped test piece 71 (smaller test piece), the plano-convex lens 5 is mainly used for focusing.

[0065] An integrated rack is also included, the integrated rack is installed with an infrared thermal imager, an infrared heating lamp 6, a micro-injection pump 15, a three-way joint 13 and a pressure sensor 12; the first experimental fixture 7 and the second experimental fixture 8 can be detachably switched below the infrared heating lamp 6.

[0066] The pressure sensor 12 and the thermocouple assembly are connected to the data acquisition device 3, and the data acquisition device 3 is connected to the computer 1 via an optical fiber 19. The infrared thermal imager is connected to the computer 1 via the optical fiber 19.

[0067] The first experimental fixture 7 includes a first lifting platform, on which a first base 81 is installed. A first telescopic frame is installed on the first lifting platform, and the first telescopic frame is detachably connected to the light homogenizer 9 .

[0068] The second experimental fixture 8 includes a second lifting platform, on which a second base 76 is installed. A second telescopic frame is installed on the second lifting platform, and the second telescopic frame is detachably connected to the plano-convex lens 5 .

[0069] The three-way joint 13 is connected to the liquid supply pipeline 10 through a pagoda head and sealed with raw tape; the three-way joint 13 is connected to the pressure sensor 12 through threads and sealed with raw tape; the first base 81 and the second base 76 are both connected to the liquid supply pipeline 10 through M6 threads, and the interfaces are sealed with raw tape.

[0070] A method for testing an adjustable sweating and cooling effect testing system, comprising the following steps:

[0071] Step 1: Determine and select the first experimental fixture 7 or the second experimental fixture 8 according to the size of the test piece to fix and assemble the test piece;

[0072] Step 2: Turn on the infrared heating lamp 6 to heat the area where the test piece is located;

[0073] Step three: when the temperature change difference detected by the thermocouple assembly and the infrared thermal imager is less than 1°C, the microinjection pump 15 is turned on to inject water, and the infrared thermal imager 18 is used to collect the surface temperature and perform real-time surface temperature data monitoring; the thermocouple assembly is used to monitor the internal temperature data of the test piece; the pressure sensor 12 is used to monitor the pressure at the entrance of the test piece in real time; the computer 1 stores the data collected by the pressure sensor 12, the infrared thermal imager and the thermocouple assembly.

[0074] The evaluation index is mainly the temperature during quantitative liquid supply. The lower the temperature, the better the sweating cooling effect.

[0075] In step 3, the acquisition frequency of the infrared thermal imager 18 is 50 Hz, that is, it can collect temperature data 50 times per second.

[0076] Twenty-two first thermocouples are connected to the first experimental fixture 7 . The twenty-two first thermocouples are grouped in pairs for detecting the temperature value at the same radial position. The average of the two temperature values ​​at the same radial position is the temperature value at the current radial position.

[0077] Eight second thermocouples are connected to the second experimental fixture 8. The eight second thermocouples are grouped in pairs for detecting the temperature value at the same thickness position. The average of the two temperature values ​​at the same thickness position is the temperature value at the current thickness position.

[0078] The output signal of the pressure sensor 12 is 0-10V, and data is collected every 1 second.

[0079] The first thermocouple and the second thermocouple have a head diameter of 0.25 mm and a length of 1 m.

[0080] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An adjustable sweating cooling effect testing system, characterized in that: It includes a liquid supply mechanism, which includes a micro-injection pump, a three-way joint and a liquid supply pipeline. The outlet of the micro-injection pump is connected to the liquid supply pipeline and the pressure sensor respectively through the three-way joint; Also included is a first experimental fixture suitable for sheet-shaped test pieces and a second experimental fixture suitable for block-shaped test pieces; The first experimental fixture includes a first base, a liquid supply vertical tube, and a supporting member. The bottom of the first base is detachably connected to the liquid supply pipeline. The bottom of the liquid supply vertical tube is plugged into the first base and connected to the liquid supply pipeline. The top of the liquid supply vertical tube is plugged into the supporting member. The supporting member includes a sheet-shaped test piece, a gasket, and a heat insulation sheet adhesively connected from top to bottom. The top of the liquid supply vertical tube is connected to the bottom of the sheet-shaped test piece. The second experimental fixture includes a second base, a heat-insulating cover, and a reflective film. The second base is provided with a mounting groove for embedding the block test piece. The mounting groove and the block test piece are sealed with a sealant. The bottom of the base is provided with a docking hole for docking the liquid supply pipeline and the bottom of the block test piece. The heat-insulating cover is sleeved on the outer periphery of the second base, and an exposure opening is formed on the heat-insulating cover for exposing the upper surface of the block test piece. The rest of the heat-insulating cover except the exposure opening is covered with the reflective film; It also includes an infrared heating lamp for providing heat to the test piece, a light homogenizer is installed between the infrared heating lamp and the first experimental fixture, and a plano-convex lens is installed between the infrared heating lamp and the second experimental fixture; It also includes an infrared thermal imager for collecting the surface temperature of the test piece and a thermocouple assembly for collecting the internal temperature of the test piece. The thermocouple assembly includes a first thermocouple for sensing the temperature at different radial positions on the bottom of the sheet test piece and a second thermocouple for sensing the longitudinal temperature at different thickness positions of the block test piece.

2. The adjustable sweating cooling effect testing system according to claim 1, characterized in that: The gasket is provided with a through hole for passing a first thermocouple, and the first thermocouple is used to abut against the bottom of the sheet-like test piece.

3. The adjustable sweating cooling effect testing system according to claim 2, characterized in that: The gasket is provided with four circumferentially arranged perforation groups, and each perforation group is provided with the perforations extending radially outward from the side adjacent to the docking hole to the side away from the docking hole.

4. The adjustable sweating cooling effect testing system according to claim 1, characterized in that: The side wall of the block test piece is provided with a through hole arranged longitudinally for passing a second thermocouple, and the second thermocouple is used to abut against the side wall of the block test piece.

5. The adjustable sweating cooling effect testing system according to claim 1, characterized in that: It also includes an integrated frame, on which the infrared thermal imager, the infrared heating lamp, the microinjection pump, the three-way connector and the pressure sensor are installed; The first experimental jig and the second experimental jig can be detachably switched under the infrared heating lamp.

6. The adjustable sweating cooling effect testing system according to claim 1, characterized in that: The first experimental fixture includes a first lifting platform, the first base is installed on the first lifting platform, a first telescopic frame is installed on the first lifting platform, and the first telescopic frame is detachably connected to the light homogenizer; The second experimental fixture includes a second lifting platform, the second base is installed on the second lifting platform, a second telescopic frame is installed on the second lifting platform, and the second telescopic frame is detachably connected to the plano-convex lens.

7. The adjustable sweating cooling effect testing system according to claim 1, characterized in that: The diameter of the plano-convex lens is 50 mm, the upper side of the plano-convex lens is a plane, the lower side of the plano-convex lens is a convex surface, and the thickness of the plano-convex lens at its maximum thickness is 19.2 mm; The diameter of the light homogenizer is 50 mm, and the light homogenizer is double-sided frosted glass with a roughness of 1500 mesh and a thickness of 2 mm.

8. The adjustable sweating cooling effect testing system according to claim 1, characterized in that: The three-way joint is connected to the liquid supply pipeline through a pagoda head and sealed with raw tape; the three-way joint is connected to the pressure sensor through threads and sealed with raw tape; the first base and the second base are both connected to the liquid supply pipeline through M6 threads, and the interfaces are sealed with raw tape.

9. The method for testing an adjustable sweating cooling effect testing system according to claim 1, characterized in that: The steps include: Step 1: Determine whether to select the first experimental fixture or the second experimental fixture according to the size of the test piece to fix and assemble the test piece; Step 2: Turn on the infrared heating lamp to heat the area where the test piece is located; Step 3: When the temperature difference detected by the thermocouple assembly and the infrared thermal imager is less than 1°C, the microinjection pump is turned on to inject water, and the infrared thermal imager is used to collect the surface temperature for real-time surface temperature data monitoring; the thermocouple assembly is used to monitor the internal temperature data of the test piece; A pressure sensor is used to monitor the pressure at the inlet of the test piece in real time; The computer stores the data collected by the pressure sensor, the infrared thermal imager and the thermocouple assembly.

10. The method for testing an adjustable sweating and cooling effect testing system according to claim 9, wherein: In step 3, the acquisition frequency of the infrared thermal imager is 50 Hz, which means that it can collect temperature data 50 times per second; Twenty-two first thermocouples are connected to the first experimental fixture. The twenty-two first thermocouples are grouped in pairs for detecting the temperature value at the same radial position. The average of the two temperature values ​​at the same radial position is the temperature value at the current radial position. The second experimental fixture is connected to eight second thermocouples. Two of the eight second thermocouples are grouped together to detect the temperature value at the same thickness position. The average of the two temperature values ​​at the same thickness position is the temperature value at the current thickness position. The output signal of the pressure sensor is 0-10V, and data is collected every 1s.

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