Fire resistance testing device for sweating cooling material

Abstract

The utility model discloses a sweating cooling material fire resistance testing device which comprises a fire supply system, a sample system, a cooling system and a data acquisition system, the fire supply system is located right in front of the sample system, the sample system is communicated with the cooling system through a water delivery pipe, and the data acquisition system is located in front of the sample system. The data acquisition system is electrically connected with the sample system; the fire supply system comprises an oxygen cylinder, a propane cylinder, a gas mass flow meter and a burner, the oxygen cylinder and the propane cylinder are respectively communicated with the gas mass flow meter through a first gas pipeline, and the gas mass flow meter is communicated with the burner through a second gas pipeline. By adopting the fire resistance testing device for the sweating cooling material, the relationship among variable high-temperature flame heat flow, cooling water flow and the temperature of the back surface of the test piece can be obtained.

Description

Technical Field

[0001] This utility model relates to the field of aerospace thermal protection technology, and in particular to a device for testing the fire resistance of sweating cooling materials. Background Technology

[0002] Sweating cooling, as a highly efficient active thermal protection technology, is widely used in extreme high-temperature and high-heat-flux environments such as aerospace engine combustion chambers, hypersonic vehicle leading edges, and gas turbine blades. Its core principle is to use a porous medium to allow coolant (such as gas or liquid) to seep out, forming a uniform heat-insulating gas film on the high-temperature surface, and achieving efficient heat dissipation through phase change heat absorption and convective heat transfer.

[0003] With the rapid development of high thrust-to-weight ratio aero-engines and reusable spacecraft, sweating cooling technology faces increasingly stringent requirements. To verify whether materials can maintain structural integrity under transient heat flux and to explore the nonlinear effects of multiple factors such as pressure gradient, temperature field, and flow rate on their cooling efficiency, it is necessary to simulate actual working conditions using dedicated testing equipment to achieve synergistic optimization across physical fields. Existing testing systems have significant shortcomings in terms of accuracy, repeatability, and multi-parameter coupling analysis. Summary of the Invention

[0004] The purpose of this invention is to provide a device for testing the fire resistance of sweating cooling materials, which solves the problem of multi-parameter coupling in sweating cooling tests in the prior art. It can stably obtain the temperature change on the back side of porous media materials under fixed conditions, and explore the thermal protection efficiency of porous media materials under high temperature, high heat flux density and different coolant pressure conditions.

[0005] To achieve the above objectives, this utility model provides a testing device for the fire resistance performance of sweating and cooling materials, including a fire supply system, a sample system, a cooling system, and a data acquisition system. The fire supply system is located directly in front of the sample system, the sample system is connected to the cooling system through a water supply pipe, and the data acquisition system is electrically connected to the sample system.

[0006] The fire supply system includes an oxygen cylinder, a propane cylinder, a gas mass flow meter, and a burner. The oxygen cylinder and the propane cylinder are respectively connected to the gas mass flow meter through a first gas pipeline, and the gas mass flow meter is connected to the burner through a second gas pipeline.

[0007] Preferably, the sample system includes a sample holder, a sample box, an infrared thermal imager, a thermocouple, a sample to be tested, and fasteners, wherein the sample box is a rectangular cavity structure with openings at the front and back.

[0008] Preferably, the test sample is placed in the central channel of the sample box, and the test sample is fixed in the sample box by the fastener. A circular through hole is provided at the center of the fastener, and two thermocouples are installed on both sides of the through hole. The top of the thermocouples is in contact with the back of the test sample.

[0009] Preferably, the infrared thermal imager is placed 1m in front of the sample box.

[0010] Preferably, the diameter of the test sample is 30-50 mm and the thickness is 10-30 mm.

[0011] Preferably, the cooling system includes a water tank, a high-pressure metering pump, and a cooling water circulation device. Two water inlets connected to the cooling system are provided on the back of the sample box. The water tank is connected to the high-pressure metering pump through a water supply pipe, and the cooling water circulation device is connected to the water inlets provided on the back of the sample box through a water supply pipe.

[0012] Preferably, the data acquisition system is electrically connected to the thermocouple via a wire.

[0013] Preferably, the flame temperature of the burner is between 1200℃ and 2000℃.

[0014] Therefore, the present invention employs the above-mentioned refractory performance testing device for sweating cooling materials, and the beneficial effects are as follows:

[0015] (1) The experimental method used in this invention can stably obtain the temperature change on the back side of the porous medium material under fixed conditions.

[0016] (2) The design of the square sample box in this utility model can improve the cooling efficiency and reduce the impact of high temperature flame on the side of the sample.

[0017] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is an overall structural block diagram of an embodiment of the refractory performance testing device for sweating and cooling materials according to this utility model;

[0019] Figure 2 This is a structural diagram of the fire supply system of an embodiment of the refractory performance testing device for sweating cooling materials according to this utility model;

[0020] Figure 3 This is a structural diagram of the sample system and data acquisition system of an embodiment of the refractory performance testing device for sweating cooling materials according to this utility model;

[0021] Figure 4This is a structural diagram of the cooling system of an embodiment of a sweating cooling material fire resistance testing device of this utility model;

[0022] Figure 5 This is a schematic diagram of the back of the sample box in an embodiment of the refractory performance testing device for sweating and cooling materials according to this utility model;

[0023] Figure 6 This is a schematic diagram of the sample box of an embodiment of the refractory performance testing device for sweating cooling materials according to this utility model;

[0024] Figure 7 This is an infrared dynamic temperature curve under a certain test condition of an embodiment of a sweating cooling material fire resistance testing device of this utility model;

[0025] Figure 8 This is an embodiment of a sweating cooling material fire resistance testing device of this utility model, showing the dynamic temperature curve of the back of the sample under a certain test condition.

[0026] Figure Labels

[0027] 1. Fire supply system; 11. Oxygen cylinder; 12. Propane cylinder; 13. Gas mass flow meter; 14. Burner;

[0028] 2. Sample system; 21. Sample holder; 22. Sample box; 23. Thermocouple; 24. Infrared thermal imager; 25. Sample to be tested; 26. Fasteners;

[0029] 3. Cooling system; 31. High-pressure metering pump; 32. Water tank; 33. Cooling water circulation device;

[0030] 4. Data acquisition system. Detailed Implementation

[0031] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0032] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] like Figure 1 As shown, a heat resistance testing device for sweating and cooling materials includes a heat supply system 1, a sample system 2, a cooling system 3, and a data acquisition system 4. The heat supply system 1 is located directly in front of the sample system 2. The sample system 2 is connected to the cooling system 3 through a water supply pipe. The data acquisition system 4 is electrically connected to the sample system 2.

[0034] like Figure 2 As shown, the fire supply system 1 includes an oxygen cylinder 11, a propane cylinder 12, a gas mass flow meter 13, and a burner 14. The oxygen cylinder 11 and the propane cylinder 12 are respectively connected to the gas mass flow meter 13 through a first gas pipeline to control the gas flow rate and flow rate. The gas mass flow meter 13 is then connected to the burner 14 through a second gas pipeline for fire supply.

[0035] like Figure 3 As shown, the sample system includes a sample holder 21, a sample box 22, a thermocouple 23, an infrared thermal imager 24, a sample to be tested 25, and fasteners 26. The sample holder 21 provides support for the overall sample system 2.

[0036] The sample box 22 is a rectangular cavity structure with openings at the front and back. The sample to be tested 25 is placed in the central channel of the sample box 22. There are two water inlets on the back of the sample box 22 that are connected to the cooling system 3. When the cooling circulation system 33 of the cooling system 3 supplies water, it can cool down the sample box 22.

[0037] The fire supply system 1 applies a stable flame at a fixed time and temperature (between 1200℃ and 2000℃) to the fire-exposed surface of the test sample 25. The infrared thermal imager 24 is located 1m directly in front of the fire-exposed surface of the test sample 25 and is used to collect the temperature of the fire-exposed surface and the flame temperature of the test sample 25.

[0038] The test sample 25 is fixed in the sample box 22 by fastener 26. Specifically, the fastener 26 has a circular through hole in the middle for water to flow to the back of the test sample 25. The fastener 26 is connected to the high-pressure metering pump 31 of the cooling system 3. The rear end of the fastener 26 is provided with a water inlet connected to the high-pressure metering pump 31. Water is flowed to the back of the test sample 25, which can realize the function of sweating and cooling of the test sample 25.

[0039] Two thermocouples 23 are installed on both sides of the through hole. The tips of the thermocouples 23 are inserted into the back of the sample 25 to measure the temperature of the back of the sample 25. The data acquisition system 4 is electrically connected to the thermocouples 23 via wires for data transmission and acquisition. An infrared thermal imager 24 is placed 1m in front of the sample box 22 to monitor the temperature of the sample box 22 and the surrounding environment. The sample 25 has a diameter of 30-50mm and a thickness of 10-30mm.

[0040] like Figure 4 As shown, the cooling system 3 includes a water tank 32, a high-pressure metering pump 31, and a cooling water circulation device 33. The water tank 32 is connected to the high-pressure metering pump 31 via a water supply pipe to provide cooling water at a certain pressure to the sample. The high-pressure metering pump 31 can control the water flow rate and velocity. The high-pressure metering pump 31 is then connected to the fastener 26 via a water supply pipe to deliver water to the back of the sample, thereby achieving the cooling function of the sweating material. The cooling water circulation device 33 is connected to the water inlet on the back of the sample box 22 via a water supply pipe to provide a cooling effect to the side of the sample 25 to be tested inside the sample box 22.

[0041] When this utility model device is used, the specific steps include:

[0042] (1) Flame temperature control:

[0043] First, adjust the gas flow rate and the distance between the burner 14 and the center of the flame-receiving surface of the test sample 25 according to the test conditions to make the flame temperature reach the set temperature.

[0044] (2) Sample installation:

[0045] Prepare the test sample 25 according to the sample requirements, measure and record the mass and dimensions of the test sample 25. Fix the test sample 25 in the sample box 22, with the flame-receiving surface facing the center of the burner 14. Place two thermocouples 23 in the central area of ​​the unflamed surface. The thermocouples 23 can measure the temperature change of the back of the sample in real time. After setting the water flow rate, flow water to the back of the sample, turn on the cooling water circulation device, and ignite to prepare for the test.

[0046] (3) Sample back temperature data acquisition and processing

[0047] Test sample 25 according to the set parameters, observe the test phenomena that occur in test sample 25 during the test, test the weight of the sample after the test, calculate the mass ablation rate and linear ablation rate, obtain the change curves of flame temperature and sample back temperature over time during the test, and evaluate the fire resistance performance of the sweating material.

[0048] Therefore, this utility model uses the above-mentioned sweating cooling material fire resistance test device to explore the thermal protection efficiency of porous media materials under high temperature, high heat flux density and different coolant pressure conditions.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A device for testing the fire resistance of sweating cooling materials, characterized in that: It includes a fire supply system, a sample system, a cooling system, and a data acquisition system. The fire supply system is located directly in front of the sample system. The sample system is connected to the cooling system through a water supply pipe. The data acquisition system is electrically connected to the sample system. The fire supply system includes an oxygen cylinder, a propane cylinder, a gas mass flow meter, and a burner. The oxygen cylinder and the propane cylinder are respectively connected to the gas mass flow meter through a first gas pipeline, and the gas mass flow meter is connected to the burner through a second gas pipeline.

2. The refractory performance testing device for sweating cooling materials according to claim 1, characterized in that: The sample system includes a sample holder, a sample box, an infrared thermal imager, a thermocouple, a sample to be tested, and fasteners. The sample box is a rectangular cavity structure with openings at the front and back.

3. The refractory performance testing device for sweating cooling materials according to claim 2, characterized in that: The test sample is placed in the central channel of the sample box and is fixed in the sample box by the fastener. A circular through hole is provided at the center of the fastener, and two thermocouples are installed on both sides of the through hole. The top of the thermocouple is in contact with the back of the test sample.

4. The refractory performance testing device for sweating cooling materials according to claim 3, characterized in that: The infrared thermal imager is placed 1m in front of the sample box.

5. The refractory performance testing device for sweating cooling materials according to claim 4, characterized in that: The diameter of the sample to be tested is 30-50 mm and the thickness is 10-30 mm.

6. The refractory performance testing device for sweating cooling materials according to claim 5, characterized in that: The cooling system includes a water tank, a high-pressure metering pump, and a cooling water circulation device. Two water inlets connected to the cooling system are provided on the back of the sample box. The water tank is connected to the high-pressure metering pump through a water supply pipe, and the cooling water circulation device is connected to the water inlets provided on the back of the sample box through a water supply pipe.

7. The refractory performance testing device for sweating cooling materials according to claim 6, characterized in that: The data acquisition system is electrically connected to the thermocouple via a wire.

8. The refractory performance testing device for sweating cooling materials according to claim 7, characterized in that: The flame temperature range of the burner is between 1200℃ and 2000℃.

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