Hypersonic aircraft thermal structure scheme capable of improving aerodynamic efficiency

Abstract

According to a hypersonic aircraft thermal structure scheme capable of improving the aerodynamic efficiency, phenolic resin materials are arranged on the surface, namely the lower wall surface of an aircraft shell, which has a positive effect on lifting force, and phenolic resin materials are not arranged on the surface, namely the upper wall surface of the aircraft shell, which has a negative effect on the lifting force any more, other thermal insulation materials which do not generate gas when heated are used; in this way, the shock wave angle of the lower wall face of the aircraft shell canbe increased through the air cushion made of the phenolic resin materials, the pressure intensity of the lower wall face is increased accordingly, the pressure intensity cannot be increased due to the fact that the air cushion is formed on the upper wall face, and therefore the difference between the upper pressure intensity and the lower pressure intensity of the aircraft is increased, and the total lift force of the aircraft is increased. Moreover, the air cushion generated by the phenolic resin material on the lower wall surface can also reduce the frictional resistance, so that the overall resistance of the aircraft is reduced, and the overall lift-drag ratio of the aircraft is improved.

Description

technical field [0001] The invention relates to the technical field of aircraft aerodynamics, in particular to a thermal structure scheme for a hypersonic aircraft that can improve aerodynamic efficiency. Background technique [0002] Hypersonic refers to flight speeds above Mach 5. When the flight speed of the aircraft reaches hypersonic speed, the heat flow on its surface will reach a level that conventional materials cannot bear under the influence of aerodynamic heating phenomenon. Therefore, hypersonic vehicles require the use of heat-resistant composite materials in surface areas with higher heat flux. The heat-resistant composite materials with a long history are phenolic resin materials, which are mainly used for the inner surfaces of missiles, space shuttles and rocket engines. Phenolic resin materials can be cracked under the influence of high temperature to generate gas to take away a lot of heat, so as to prevent the heat flow from damaging the internal equipme...

AI Technical Summary

Problems solved by technology

For a hypersonic vehicle, changes in the aerodynamic shape will also lead to changes in the shock angle, which may cause the aerodynamic efficiency of the vehicle to deviate from the predicted level at the time of design

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