Test device for heat-resistant material performance test

Abstract

The invention relates to a test device for a heat-resistant material performance test. The test device comprises an inner shell and an outer shell which are coaxially arranged, and a cooling water channel is formed between the outer shell and the inner shell; a connecting ring is arranged on the periphery of one end of the inner shell, the inner shell is connected with one end of the outer shell through a connecting ring, and a water inlet and a water outlet are formed in the connecting ring and communicated with the cooling water channel, so that the cooling water enters from the water inlet,flows through the cooling water channel and then flows out of water outlet; a first mounting cavity used for installing a to-be-tested mold and a second mounting cavity used for allowing a thermocouple device to penetrate through are formed in the end, away from the connecting ring, of the inner shell in sequence in the axial direction of the inner shell, the to-be-tested mold is prepared from aheat-resistant material, and the thermocouple device is used for detecting the temperature of the to-be-tested mold. According to the test device, longitudinal heat conduction of the heat-resistant material in the evaluation process can be effectively reduced, and it is ensured that the surface of the to-be-tested model is heated uniformly and heat conduction of the heat-resistant material is quasi one dimensional conduction.

Description

technical field [0001] The invention belongs to the technical field of performance assessment equipment for heat-resistant materials, and in particular relates to a test device for performance assessment of heat-resistant materials. Background technique [0002] In order to ensure the reliability of the thermal protection system design of hypersonic vehicles, the performance of the thermal protection materials must be assessed on the ground, and the ground equipment is used to simulate the high-enthalpy heating flow field environment, and a long-term assessment test is carried out. At present, the most commonly used method is to process the model into a spherical cylinder model or a flat plate model, place it in a high-temperature flow field, and evaluate its heat resistance performance. [0003] The material assessment test using the ball-column model simulates the stagnation point heat flow and stagnation point pressure of the material in the high-temperature flow field, w...

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Problems solved by technology

In the stagnation point ablation test, the top of the ball cylinder model is in the center of the flow field, the closest to the outlet of the nozzle, and the heat flow and pressure are the highest, thus ensuring the stagnation point heat flow and stagnation point pressure in the test, but there are two defects : (a) Beyond the stagnation point, along the radial direction of the ball column, the heat and pressure on the surface of the model continue to decrease, resulting in uneven heat flow on the surface of the ball column model, and the ablation amount may be inconsistent everywhere. The erosion rate cannot effectively characterize the heat resistance performance of materials; (b) In addition to the high-temperature gas flow heating at the head, the cylinder part of the ball head model is also heated by high-temperature gas radiation, there is radial heat transfer, and the stagnation point heat flow cannot characterize the model total heating capacity

In the flat plate ablation test, the model is arranged along the direction of the nozzle and has a certain angle of attack, which can heat a large area of ​​the model, but it has the following two defects: (a) the heat flow / pressure distribution on the surface of the flat plate is not uniform, due to the Due to the high enthalpy flow field characteristics, the heat flow and pressure on the surface of the flat plate are high in the middle and low on both sides, and the axial distribution is inversely proportional to the distance from the nozzle outlet, which leads to uneven ablation on the surface of the flat plate model, making it difficult to quantitatively evaluate (b) The heat flow pressure on the surface of the flat plate is low. Since the test surface of the flat plate is arranged along the direction of the nozzle, even with a certain angle of attack, it is impossible to obtain high surface heat flow and pressure.

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