A heat insulation layer for heaters used in high-flow, high-temperature, high-pressure, and high-speed gas environments

Abstract

The invention belongs to the technical field of hypersonic wind tunnel test equipment, and discloses a heat insulation layer for a heater used in a high-flow, high-temperature, high-pressure, and high-speed gas environment. The heat insulation layer of the heater includes shell layer, castable layer, isolation layer I, fiber stack insulation layer, isolation layer II and inner liner stacked sequentially from outside to inside; it also includes through castable layer, isolation layer Ⅰ and anchors for fiber laminate insulation. The heat insulation layer of the heater has the characteristics of light weight, reliability, high efficiency, no slag dropping, and no displacement under harsh working conditions such as high temperature, high pressure, vacuum suction, and large flow scouring, which ensures that the test air flow is clean and pollution-free, and improves Wind tunnel flow field quality and test data quality.

Description

technical field [0001] The invention belongs to the technical field of hypersonic wind tunnel test equipment, and in particular relates to a heat insulation layer for a heater used in a high-flow, high-temperature, high-pressure, high-speed gas environment. Background technique [0002] In a conventional hypersonic wind tunnel using air as the test medium, due to the extremely high gas flow velocity, reaching Mach number 5 to Mach number 10, the violent expansion of the gas flow through the nozzle will cause water vapor and carbon dioxide to condense, resulting in irregularities in the flow field. The uniformity makes the test data inaccurate, which is not allowed in the hypersonic wind tunnel aerodynamic test. Therefore, in a conventional hypersonic wind tunnel with a large flow of high-speed air as the medium, it is necessary to install a regenerative heater to heat the airflow to the required anti-condensation temperature. Since the main purpose of the hypersonic wind tu...

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Problems solved by technology

The direct use of the traditional heat insulation layer in the hypersonic wind tunnel regenerative heater has the following disadvantages: a. Lightweight high-aluminum castables have high density and high thermal conductivity, resulting in thicker and heavier heat insulation layers of the heater, resulting in energy loss It is large, and increases the weight of the heater, which increases the difficulty of heater installation foundation construction; b. Light high-alumina castables may crack under repeated high-temperature and high-pressure conditions for a long time, causing hot gas inside the heater to leak to the shell, affecting the heater The shell is safe to use; c. Lightweight high-alumina castables have slag falling under the high-speed and large-flow airflow, which pollutes the test airflow and affects the quality of the wind tunnel flow field; d. Aluminum silicate fiber cotton is vacuum pumped, high-speed and large There is a displacement under the flow of air flow, which leads to the failure of local heat insulation and affects the safety of the shell.

e. Aluminum silicate fiber cotton has serious slag falling under vacuum suction and high-speed and large-flow airflow, which pollutes the test airflow and affects the quality of the wind tunnel flow field

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