Thermal insulation characteristics of high-temperature heat seals for hypersonic aero-engines

Abstract

The high-temperature baseline sealing thermal protection technology is of great significance to realizing hypersonic aero-engines and aircraft. Based on the fact that there are few studies on the high-temperature baseline heat sealing in the ultra-high temperature environment (above 1000 °C), the paper establishes a simulation model to analyze the influence of different characteristic parameters on the thermal protection performance of the heat seal at ultra-high temperature and carried out experiments. Verification, simulation, and experiment error are less than 6%. The research results show that the aluminum silicate fiber has the best thermal insulation effect in the material of the inner thermal insulation layer, and the temperature can be lowered by more than 900 °C under an environment of 1200 °C. It is used to prepare heat seals. In addition, the filling density and thickness of the inner thermal insulation layer have little influence on the thermal insulation effect, and the influence coefficient does not exceed 5%. In the test of the degree of degradation of the thermal insulation performance of the heat seal, it is found that it does not exceed 5%, which meets the requirements for use. This paper further promotes the development of high-temperature thermal protection technology. It can also provide a corresponding technical basis for developing supersonic aero-engines.