A porous material active cooling test device and test method thereof

Abstract

A porous material active cooling test device and a test method thereof, relating to active cooling of porous materials. The device is provided with a support frame, a condensate protection system, a coolant delivery system, a gas flame generation system, and an infrared temperature measurement system; the condensate protection system is composed of a water tank, a water pipe, a pipe valve, and a protective cover; the coolant delivery system is composed of a coolant storage bin, a hose, a metering pump, a coolant delivery pipe, a double U-shaped clamp, a liquid pressure sensor, and a sample; the gas flame generation system is composed of a gas cylinder, an oxygen cylinder, a gas valve, an oxygen valve, a gas pipe, an oxygen pipe, a gas flame generation device, and a fixture. The coolant delivery pipe is installed in two stages, which is convenient for replacing the sample after the test and reducing the test time. Most of the equipment is integrated on the support frame, which is easy to operate and convenient for the storage and reuse of the test device. Only a small flow rate of coolant is required to complete the substantial cooling of the sample, and the driving force required for active cooling is low.

Description

Technical Field

[0001] The invention relates to active cooling of porous materials, and in particular to an active cooling test device and a test method of porous materials in an ultra-high temperature environment. Background Art

[0002] Aerospace is an extremely important field for human development in the 21st century. In particular, the exploration of outer space can expand human cognition and understanding of the universe. At the same time, the development and utilization of space resources is particularly necessary. The progress of science and technology has promoted the vigorous development of aerospace. With the in-depth exploration of the aerospace field, the performance requirements of aerospace vehicles are getting higher and higher, and their flight speed has reached hypersonic speed. What follows is the engine system with more intense reactions and higher temperatures. The internal gas flow rate of such a high-demand engine has reached 2000-4000m / s, and the temperature is even higher than 3500K, which has exceeded the melting point of most substances. Therefore, to ensure the long-term operation of the engine, it is necessary to adopt efficient thermal protection technology to protect the device materials.

[0003] Common thermal protection technologies can be divided into passive cooling and active cooling. Passive cooling includes capacitive cooling, ablation cooling, etc., and active cooling includes convection cooling, film cooling, and sweating cooling. In comparison, active cooling has stronger cooling capacity. As an important and efficient active thermal protection technology, sweating cooling uses porous materials as the matrix and uses coolant to conduct convective heat exchange in the porous material to take away a large amount of heat, thereby significantly reducing the temperature of the material. Therefore, this cooling technology can ensure the use of materials in ultra-high temperature environments, such as in large devices such as rocket engines and missiles. This active cooling technology has the advantages of high cooling efficiency and large cooling range, showing great development potential. At present, the commonly used test methods for sweating cooling of porous materials are simulation tests such as wind tunnels. Although the test results are good and can well characterize the cooling performance of porous materials, these methods still have shortcomings. Their setup is relatively complicated and the testing cost is also relatively high.

[0004] Therefore, it is urgent to explore an efficient and simple porous material active cooling test device and its test method. At present, there are few patents reporting sweating cooling test devices and test methods. Patent CN207703750U discloses a radiation heating-sweating cooling test device, which uses a quartz lamp to radiate and heat the sample, and introduces a coolant through the effusion cavity to achieve substantial cooling of the porous material. However, the maximum heat flux density of the quartz lamp radiation heating used in this method is only 0.4MW / m 2, and it is difficult to safely measure the hot end surface temperature of the material using thermocouples. Patent CN210572067U discloses a test method based on an oxyacetylene flame to generate a high-temperature flame on the outside of a porous material sample, and adjusting the coolant flow rate through a coolant regulating device to achieve cooling of the porous material. However, in this method, the high-temperature airflow is water and carbon dioxide generated by the reaction of oxyacetylene and oxygen, which has a great impact on infrared temperature measurement and is prone to errors. In addition, the overall equipment of the device is relatively large. Although the operation is simple, the assembly is cumbersome and it is difficult to use repeatedly for a long time. Summary of the invention

[0005] The purpose of the present invention is to provide a simple, accurate, integrated and easy-to-assemble test device for active cooling of porous materials in a high temperature environment in view of the limitations of the active cooling technology test method.

[0006] Another object of the present invention is to provide a testing method for a porous material active cooling test device that uses a low flow rate coolant to significantly cool a sample and has a low driving force.

[0007] The porous material active cooling test device is provided with a support frame, a condensation water protection system, a coolant delivery system, a gas flame generation system, and an infrared temperature measurement system;

[0008] The support frame is formed by connecting stainless steel columns and stainless steel plates and is used to support other equipment;

[0009] The condensate protection system is composed of a water tank, a water pipe, a pipe valve and a protective cover; the protective cover is composed of two nested layers of stainless steel; the inner layer of stainless steel of the protective cover forms a semi-enclosed space with closed sides and open ends; a closed space is formed between the two layers of stainless steel, and only two small tubes are extended on the upper and lower sides of the back of the protective cover as inlets and outlets; the outer layer of stainless steel is open to the atmosphere; the outer small tube on the lower side is connected to the water tank through a water pipe, in which a pipe valve is added as a switch; the outer small tube on the upper side outputs the condensate through the water pipe to ensure that it enters from the bottom and exits from the top; the two small tubes are fixed in the corresponding holes of the stainless steel column on the support frame;

[0010] The coolant delivery system consists of a coolant storage bin, a hose, a metering pump, a coolant delivery pipe, a double U-shaped clamp, a liquid pressure sensor and a sample; the coolant storage bin is used to store coolant; one end of the metering pump is connected to the coolant storage bin through a hose, and the other end is connected to the coolant delivery pipe through a hose; the metering pump is fixed on the bottom plate of the support frame; the coolant delivery pipe is divided into two parts, and the two parts of the coolant delivery pipe are connected by internal and external threads, one part of the coolant delivery pipe is located outside the back of the protective cover, and is fixed to the stainless steel column on the support frame through two double U-shaped clamps, and the liquid pressure sensor It is installed on the end of the coolant delivery pipe of this part close to the protective cover through the threaded hole; the side of the sample is sealed and the back of it is bonded to the other end of the other part of the coolant delivery pipe. The coolant delivery pipe with the sample adhered to it passes through the semi-enclosed space surrounded by the inner stainless steel layer of the protective cover, and ensures that the front of the sample is parallel to the front of the protective cover; the metering pump draws the coolant, transports it to the back of the sample through the coolant delivery pipe, and then transports it to the front of the sample through the pores of the sample; the part of the coolant delivery pipe with the sample can be disassembled after testing one sample, and another stainless steel pipe bonded with a porous sample can be installed as a new coolant delivery pipe for testing.

[0011] The gas flame generating system is composed of a gas cylinder, an oxygen cylinder, a gas valve, an oxygen valve, a gas pipe, an oxygen pipe, a gas flame generating device, and a fixture. The gas flame generating device is fixed to a stainless steel column of a supporting frame through a fixture. The gas cylinder provides gas, which is transported to the gas flame generating device through a gas pipe. The oxygen cylinder provides oxygen, which is transported to the gas flame generating device through an oxygen pipe. The gas valve and the oxygen valve are used to control the gas flow rate. The gas flame generating device is used to mix the gas and oxygen, and starts to react after providing a small amount of heat to generate a high-temperature airflow, which is sprayed on the front of the sample.

[0012] The metering pump is fixed on the bottom plate of the supporting frame by fixing screws.

[0013] The coolant delivery pipe is a stainless steel pipe.

[0014] The sides of the sample are sealed by high temperature resistant sealant and the sample is bonded to one end of the delivery pipe.

[0015] The infrared temperature measurement system uses an infrared thermometer to measure the temperature of the front surface of the sample, and is fixed on the support frame through a fixture.

[0016] The testing method of the porous material active cooling test device of the present invention comprises the following steps:

[0017] 1) Connect the coolant delivery pipe with the sample bonded to another section of the delivery pipe, penetrate it into the space surrounded by the inner stainless steel layer of the protective cover, and keep the front of the sample parallel to the front of the protective cover;

[0018] 2) Condensed water is introduced into the lower extension tube on the back of the protective cover until water flows out of the water pipe connected to the upper extension tube;

[0019] 3) Turn on the metering pump and introduce coolant at a certain flow rate;

[0020] 4) Open the gas and oxygen valves, and introduce gas and oxygen. After the gas and oxygen are evenly mixed in the gas flame generating device, a small amount of heat is provided in the gas flame generating device, and the gas and oxygen begin to react to generate a high-temperature flame, which is sprayed on the front of the sample;

[0021] 5) After the readings of the liquid pressure sensor and the infrared thermometer are stable, conduct the test for a certain period of time, and record the flow rate of the metering pump, the flow rate of the gas and oxygen, the pressure of the liquid pressure sensor, and the temperature of the infrared thermometer during the test;

[0022] 6) After the test is completed, first close the gas and oxygen valves, extinguish the flame, wait until the temperature of the sample and the protective cover drops to room temperature, then turn off the cooling water, then turn off the condensing water, and finally turn off all motors.

[0023] In step 4), the fuel gas may be a combustible gas such as methanol, acetylene, butane or hydrogen, and the temperature of the high-temperature flame is between 1200 and 3200°C.

[0024] In summary, the present invention has the following beneficial effects:

[0025] (1) The present invention can use a variety of flames as high-temperature gas sources, such as hydrogen-oxygen flame, oxyacetylene flame, oxybutane flame, etc., to simulate the ultra-high temperature environment in the aerospace field. The simulated temperature range is large, ranging from as low as 1200 to as high as 3200°C.

[0026] (2) The present invention uses a non-contact infrared thermometer to complete the remote measurement of the front temperature of the sample. It is particularly recommended to use an oxyhydrogen flame, whose single component after complete reaction can reduce the interference with infrared temperature measurement;

[0027] (3) The coolant delivery pipe for assembling the sample in the present invention is installed in two sections, which is convenient for replacing the sample after the test, thereby greatly reducing the test time;

[0028] (4) The present invention integrates most of the equipment on the support frame, which is easy to operate and convenient for storage and reuse of the test device.

[0029] (5) The present invention can achieve substantial cooling of the sample under the action of a coolant with a low flow rate (less than 0.1 g / s), and the driving force required for active cooling is low (less than 60 kPa). BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of a porous material active cooling test device according to an embodiment of the present invention;

[0031] Figure 2 is a partial enlarged view of the metering pump and its surroundings in an embodiment of the present invention;

[0032] Figure 3 is a partial enlarged view of the coolant delivery pipe and its surrounding parts in an embodiment of the present invention;

[0033] Figure 4 Schematic diagram of fixing a double U-shaped clamp in an embodiment of the present invention;

[0034] Figure 5 is a front view of the protective cover in an embodiment of the present invention;

[0035] Figure 6 is a left side view of the protective cover in an embodiment of the present invention;

[0036] Figure 7 is a top view of the protective cover in an embodiment of the present invention;

[0037] Figure 8 is a partial enlarged view of the gas flame generating device and its surrounding parts in the embodiment of the present invention;

[0038] Fig. 9 yes Figure 8 AA section view in;

[0039] Fig.10 is a front temperature diagram of a homemade porous ceramic sample during the cooling process of an embodiment of the present invention;

[0040] Fig.11 It is a back pressure diagram of the homemade porous ceramic sample during the cooling process of the embodiment of the present invention. DETAILED DESCRIPTION

[0041] The present invention will be further described below by way of embodiments in conjunction with the accompanying drawings.

[0042] See also Figures 1 to 11 An embodiment of the present invention provides a porous material active cooling test device, including: a coolant delivery system 1, a condensate protection system 2, a support frame 3, an infrared temperature measurement system 4, and a gas flame generation system 5.

[0043] The coolant delivery system 1 is composed of a coolant storage bin 11, a first hose 12, a metering pump 13, a second hose 14, a first double U-shaped clamp 15, a first delivery pipe 16, a second double U-shaped clamp 17, a liquid pressure sensor 18, a second delivery pipe 19, and a sample 110.

[0044] The coolant storage tank 11 is connected to the metering pump 13 through the first rubber hose 12, the metering pump 13 is fixed on the bottom plate of the support frame 3, the first delivery pipe 16 is fixed to the stainless steel column on the support frame 3 through the first double U-shaped clamp 15 and the second double U-shaped clamp 17, the outlet of the metering pump 13 is connected to the inlet of the first delivery pipe 16 through the second rubber hose 14, one side of the second delivery pipe 19 is screwed to the first delivery pipe 16, and the other side of the second delivery pipe 19 is connected to the side of the sample 110; the liquid pressure sensor 18 is screwed to the first delivery pipe 16 through its own external thread.

[0045] The condensed water protection system 2 includes a first water pipe 21 , a pipe valve 22 , a water tank 23 , a second water pipe 24 , and a protection cover 25 .

[0046] The water tank 23 is used to store condensed water. In this embodiment, the protective cover 25 adopts a conical tube design. The first water pipe 21 is connected to the inlet of the protective cover 25, and the second water pipe 24 is connected to the outlet of the protective cover 25. The pipe valve 22 is arranged on the first water pipe 21. The condensed water flows into the protective cover 25 through the first water pipe 21 and then flows out from the second water pipe 24.

[0047] The infrared temperature measurement system 4 includes an infrared thermometer 41 and a thermometer fixture 42. The infrared thermometer 41 is fixed on the support frame 3 through the thermometer fixture 42.

[0048] The gas flame generation system 5 includes a gas flame system fixture 51 , a gas flame generation device 52 , a gas pipe 53 , a gas valve 54 , a gas cylinder 55 , an oxygen pipe 56 , an oxygen valve 57 , and an oxygen cylinder 58 .

[0049] The gas flame generating device 52 is fixed on the supporting frame 3 through the gas flame system fixer 51; the gas is stored in a gas cylinder 55, which is connected to the gas flame generating device 52 through a gas valve 54 and a gas pipe 53; the oxygen is stored in an oxygen cylinder 58, which is connected to the gas flame generating device 52 through an oxygen valve 57 and an oxygen pipe 56.

[0050] See also Figure 2 The metering pump 13 includes a first fixing screw 131, a metering pump body 132, and a second fixing screw 133. The base of the metering pump body 132 has a small hole, and the corresponding position of the support frame 3 also has a screw hole. The metering pump can be fixed to the bottom plate of the support frame 3 through the first fixing screw 131 and the second fixing screw 133.

[0051] See also Figure 3The first delivery pipe 16 is mainly fixed to the stainless steel column on the support frame 3 by the first double U-shaped clamp 15 and the second double U-shaped clamp 17, so that the first delivery pipe 16 can be fixed. The liquid pressure sensor 18 has its own external thread and is screwed to the first delivery pipe 16 through the internal thread hole of the first delivery pipe 16. The second delivery pipe 19 is also screwed to the first delivery pipe 16 through the threaded hole. When loading and unloading the sample, the second delivery pipe 19 can be replaced. The side of the porous sample 110 is sealed with a high temperature resistant sealant and connected to one end of the second delivery pipe 19 through a high temperature adhesive.

[0052] See also Figure 4 , the first double U-shaped clamp 15 fixes the first delivery pipe 16 in detail. The first double U-shaped clamp 15 is divided into a first nut 151, a partition 152, a second nut 153, and a clamp body 154. Screw holes are provided on both sides of the partition 152. The end of the clamp body 154 passes through the partition 152. The first delivery pipe 16 passes through the first double U-shaped clamp 15 and is attached to its groove. A section of stainless steel column on the support frame 3 passes through the first double U-shaped clamp 15 in a direction perpendicular to the first delivery pipe 16 and is attached to its groove. The position of the partition 152 is adjusted by the first nut 151 and the second nut 153, so that the first delivery pipe 16 is fixed to the support frame 3. The second double U-shaped clamp 17 fixes the first delivery pipe 16 in the same way.

[0053] See also Figure 5 The protective cover 25 adopting a conical tube design includes a circular plate 251, an outer conical plate 252, a circular tube 253, an inner conical plate 254, a lower small tube 255, and an upper small tube 256; there is a gap between the inner conical plate 254 and the outer conical plate 252, and the inner conical plate 254, the outer conical plate 252, the circular plate 251, and the circular tube 253 constitute a closed space, and only two small tubes extend outward on the back of the protective cover as the only two entrances and exits of the closed space; the two small tubes are the lower small tube 255 and the upper small tube 256, and the lower small tube 255 and the upper small tube 256 are used to pass through the corresponding holes of the stainless steel columns on the support frame to fix the protective cover 25 on the support frame. The lower small tube 255 is connected to the water tank through the first water pipe 21 for the inflow of condensed water; the upper small tube 256 is connected to the second water pipe 24 for the outflow of condensed water, realizing bottom-in and top-out; and the protective cover mainly protects the side of the sample 110 to prevent the high-temperature airflow from transferring heat from its side.

[0054] See Figure 6 and 7 The gas flame system fixture 51 is mainly divided into a first fixing screw 511, a U-shaped plate 512, and a second fixing screw 513. The gas flame generating device 52 is fixed to the supporting frame 3 by the first fixing screw 511 and the second fixing screw 513. The fixing of the infrared thermometer 41 by the thermometer fixture 42 is also the same.

[0055] The method for testing using the above-mentioned porous material active cooling test device has the following specific steps:

[0056] 1) Use high-temperature sealant to seal the side of the sample 110, and connect the back of the sample 110 to one end of the second conveying pipe 19 through a high-temperature adhesive;

[0057] 2) This embodiment uses water as the coolant, and the coolant is stored in the coolant storage bin 11;

[0058] 3) The water tank 23 stores enough condensed water, and the pipe valve 22 is opened, and the condensed water flows into the protective cover 25 through the first water pipe 21 until water flows out of the water outlet of the second water pipe 24, and then proceed to the next step;

[0059] 4) Turn on the metering pump 13 and introduce a coolant at a certain flow rate. In this embodiment, the coolant flow rate is 0.04 g / s. The coolant flows to the sample 110 through the first delivery pipe 16 and the second delivery pipe 19. When coolant flows out from the front side of the sample 110, i.e., the side facing the gas flame generating device 52, proceed to the next step;

[0060] 5) In this embodiment, butane is selected as the fuel gas and stored in the fuel gas cylinder 55. Oxygen is mixed with nitrogen to reduce the oxygen concentration and stored in the oxygen cylinder 58. The fuel gas valve 54 and the oxygen valve 57 are opened, and the flame generating device 52 is ignited. Butane reacts with oxygen to generate a flame, and the high-temperature airflow is sprayed on the front of the sample 110 until the readings of the liquid pressure sensor 18 and the infrared thermometer 41 are stable and maintained for a period of time;

[0061] 6) Record the pressure of the liquid pressure sensor 18 and the temperature of the infrared thermometer 41 at different times during the test;

[0062] 7) After the test is completed, first close the gas valve 54 and the oxygen valve 57, extinguish the flame, wait until the temperature of the sample 110 and the protective cover 25 drops to room temperature, then turn off the metering pump 13, then close the pipe valve 22, and finally turn off all motors.

[0063] In step 4), the metering pump 13 can be a V-00508 Aldos metering pump of Chongqing Jingtang Environmental Protection Equipment Co., Ltd., whose technical parameters are: maximum flow rate 0.48L / h; pressure: 8.2Bar; stroke: 90N / m; suction head: 1.2m; power: 12W; weight: 2.6kg; power supply: 220V. The coolant flow rate is preferably 0.02g / s to 0.04g / s.

[0064] In step 5), butane can be replaced by methanol, acetylene or hydrogen, and mixed with oxygen in a gas flame generating device to generate a methanol-oxygen flame, an oxyacetylene flame or a hydrogen-oxygen flame.

[0065] In step 6), the liquid pressure sensor 18 can be a DYB-HAG liquid pressure sensor, and its technical parameters are: measuring medium: various liquids, gases or steam compatible with 304 / 316 stainless steel; measuring pressure: 0-0.1MPa; overload pressure: 0.2MPa; power supply voltage: 24±5VDC; accuracy: 1.0, 0.5, 0.25 (including comprehensive errors including nonlinearity, repeatability and hysteresis). The temperature measurement range of the infrared thermometer is preferably 0-400°C.

[0066] The front temperature map and back pressure map of the homemade porous ceramic sample obtained by the device and method of the present invention are as follows: Figure 8 and 9 As shown. Through the test of the porous material active cooling test device on the homemade porous ceramic sample, it can be known that only a small flow rate (0.04g / s) of coolant is needed to complete the substantial cooling of the sample, and the driving force required for active cooling is also very low (2.5-4.7kPa). Therefore, the porous ceramic is suitable for active cooling as a porous material and is applied in practical engineering.

[0067] The above is an implementation method of the present invention, and other specific implementation methods can be appropriately adjusted according to actual needs.

Claims

1. A porous material active cooling test device, characterized in that It is equipped with a support frame, condensate protection system, coolant delivery system, gas flame generation system, and infrared temperature measurement system; The support frame is formed by connecting stainless steel columns and stainless steel plates and is used to support other equipment; The condensate protection system is composed of a water tank, a water pipe, a pipe valve and a protective cover; the protective cover is composed of two nested layers of stainless steel, the inner layer of the stainless steel of the protective cover forms a semi-enclosed space with closed sides and open at both ends, and a closed space is formed between the two layers of stainless steel, with only two small tubes extending upward and downward on the back of the protective cover as inlets and outlets; the outer layer of stainless steel is open to the atmosphere; the outer small tube on the lower side is connected to the water tank through a water pipe, in which a pipe valve is added as a switch; the outer small tube on the upper side outputs the condensate through the water pipe to ensure that it enters from the bottom and exits from the top; the two small tubes are fixed in the corresponding holes of the stainless steel column on the support frame; The coolant delivery system consists of a coolant storage bin, a hose, a metering pump, a coolant delivery pipe, a double U-shaped clamp, a liquid pressure sensor and a sample; the coolant storage bin is used to store coolant; the metering pump is connected to the coolant storage bin at one end of the hose and to the coolant delivery pipe at the other end; the metering pump is fixed on the bottom plate of the support frame; the coolant delivery pipe is divided into two parts, and the two parts of the coolant delivery pipe are connected by internal and external threads, one part of the coolant delivery pipe is located outside the back of the protective cover and is fixed to the stainless steel column on the support frame by two double U-shaped clamps, and the liquid pressure sensor is connected by screws. The holes are installed at one end of the coolant delivery pipe close to the protective cover; the side of the sample is sealed and the back of the sample is bonded to the other end of the coolant delivery pipe of another part. The coolant delivery pipe with the sample bonded runs through the semi-enclosed space surrounded by the inner stainless steel of the protective cover, and ensures that the front of the sample is parallel to the front of the protective cover; the metering pump extracts the coolant, transports it to the back of the sample through the coolant delivery pipe, and then transports it to the front of the sample through the pores of the sample; the coolant delivery pipe with the sample can be disassembled after testing a sample, and another stainless steel pipe bonded with a porous sample is installed as a new coolant delivery pipe for testing; The gas flame generating system is composed of a gas cylinder, an oxygen cylinder, a gas valve, an oxygen valve, a gas pipe, an oxygen pipe, a gas flame generating device, and a fixture. The gas flame generating device is fixed on a stainless steel column of a supporting frame through a fixture. The gas cylinder provides gas, which is transported to the gas flame generating device through a gas pipe. The oxygen cylinder provides oxygen, which is transported to the gas flame generating device through an oxygen pipe. The gas valve and the oxygen valve are used to control the gas flow rate. The gas flame generating device is used to mix the gas and oxygen, and after providing a small amount of heat, a reaction begins to occur, generating a high-temperature airflow, which is sprayed on the front of the sample. The infrared temperature measurement system uses an infrared thermometer to measure the temperature of the front surface of the sample, and is fixed on the support frame through a fixture.

2. A porous material active cooling test device as claimed in claim 1, characterized in that The metering pump is fixed on the bottom plate of the supporting frame by fixing screws.

3. A porous material active cooling test device as claimed in claim 1, characterized in that The coolant delivery pipe is a stainless steel pipe.

4. A porous material active cooling test device as claimed in claim 1, characterized in that The sides of the sample are sealed by high temperature resistant sealant and the sample is bonded to one end of the delivery pipe.

5. A test method for a porous material active cooling test device, characterized in that Using a porous material active cooling test device as claimed in any one of claims 1 to 4, the test method comprises the following steps: 1) Connect the coolant delivery pipe with the sample bonded to another section of the delivery pipe, penetrate it into the space surrounded by the inner stainless steel layer of the protective cover, and keep the front of the sample parallel to the front of the protective cover; 2) Let condensed water flow into the lower extension tube on the back of the protective cover until water flows out of the water pipe connected to the upper extension tube; 3) Open the metering pump and introduce coolant; 4) Open the gas and oxygen valves, and introduce gas and oxygen. After the gas and oxygen are evenly mixed in the gas flame generating device, a small amount of heat is provided in the gas flame generating device, and the gas and oxygen begin to react to generate a high-temperature flame, which is sprayed on the front of the sample; 5) After the readings of the liquid pressure sensor and the infrared thermometer are stable, conduct the test again and record the flow rate of the metering pump, the flow rates of the gas and oxygen, the pressure of the liquid pressure sensor, and the temperature of the infrared thermometer during the test; 6) After the test is completed, first close the gas and oxygen valves, extinguish the flame, wait until the temperature of the sample and the protective cover drops to room temperature, then turn off the cooling water, then turn off the condensing water, and finally turn off all motors.

6. A method for testing a porous material active cooling test device as claimed in claim 5, characterized in that In step 4), the fuel gas is methanol, acetylene, butane or hydrogen.

7. A method for testing a porous material active cooling test device as claimed in claim 5, characterized in that In step 4), the temperature of the high temperature flame is between 1200 and 3200°C.

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