Unstable-state superhight-temperature heat insulating property testing device and method

Abstract

The invention discloses an unstable-state superhight-temperature heat insulating property testing device and method. The unstable-state superhight-temperature heat insulating property testing device comprises a heating furnace, a hollow test stand and a sample bin, wherein the heating furnace comprises a furnace body; the furnace body comprises a furnace shell, an electric heater arranged in the furnace shell, and a furnace shell heat-insulating layer arranged between the electric heater and the furnace shell; the furnace shell and the test stand are connected to form a sealed first cavity; the sample bin and the test stand are connected to form a sealed second cavity; the second cavity and the first cavity communicate with each other to form a cavity structure; an air inlet and an air outlet communicating with inside and outside are formed in the test stand and the furnace shell respectively; valves are arranged respectively on the air inlet and the air outlet. The device provided bythe invention can be used for realizing high heating flux and unsteady-state tests in a sealed environment, and is applied to the use environment in which multiple samples such as heat insulating materials for a high-speed air vehicle power device are located.

Description

[0001] Technical field [0002] The invention relates to the technical field of thermal insulation performance testing, in particular to a non-steady state ultra-high temperature thermal insulation performance test device and test method. Background technique [0003] At present, the testing devices for the high-temperature thermal insulation performance of thermal insulation materials can be divided into the following categories. The first type of material thermal insulation performance testing device is a radiation-type thermal insulation test device, in which the radiation source is mainly a quartz lamp (CN101907422B, CN103439133A, CN104064929A, CN102967623A), and the light source of a small number of devices is laser (CN103196943A). The biggest disadvantage of this type of device is that only infrared radiation is used to heat the sample, the heat flux density is relatively low, and the measurement environment is mostly open or semi-closed ( Part of the sample is kept warm). Wh...

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Problems solved by technology

Moreover, because the flame directly heats the sample, it will cause airflow erosion to the sample.

The third type is a flat-panel heat insulation performance measurement device that uses heating elements to be electrically heated, mainly using silicon carbide or molybdenum disilicide heating elements, and the maximum temperature does not exceed 1600°C, and this type of device can only be measured in an air atmosphere, and the test environment is closed Mode

The fourth category is the wind tunnel test device. This type of device can simulate the actual working conditions of high-speed aircraft such as missiles to the greatest extent. However, the cost of construction and use of this type of equipment is extremely high, and the test cycle is long. It is suitable for the simulation test of the whole machine and is not suitable for conventional Research on the properties of materials

[0004] In order to solve the shortcomings of the above four types of heat insulation performance testing devices, the first type of equipment (low test temperature, low heat flux), the second type of equipment (large amount of gas production, the test environment is open), the third type of equipment ( The test temperature is low), the fourth type of equipment (high cost, long test cycle, difficult to prepare test samples, not suitable for scientific research), the applicant invented a fully enclosed ultra-high temperature heat insulation performance test device that can be applied above 2000 °C (CN104569046A), it is found through use that although the device has realized a fully enclosed ultra-high temperature test environment, due to the relatively slow heating rate, the heating time exceeds 30 minutes

Due to the long heating time, the heat of the heating element radiates to the insulation material of the furnace body and the sample, so that the ambient temperature of the entire furnace body rises. Before the test temperature is reached, the sample has reached a higher temperature, so that such The test environment has reached the steady-state heat transfer test, which is very different from the application conditions of unsteady-state heat transfer in high-speed aircraft such as missiles.

[0005] To sum up, after searching the relevant literature, there is no unsteady closed ultra-high temperature (above 2200°C) thermal insulation performance testing device at present.

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