Study On Air-breathing Hypersonic Vehicle Thrust-aerodynamic Coupling Effect

Hypersonic aircraft generally refers to Maher flight number of more than5aircraft,such as the space plane and hypersonic cruise missiles, but the latter is the most typical.Cruise missiles, only to realize fast blow to meet future combat requirements of fastreaction. Conventional cruise missile flight speed is slow, easy to be found and intercept.Hypersonic cruise missile flight speed, has the advantages of quick response, strongrange, compared with the conventional cruise missile has obvious advantages, can adaptto the needs of future combat.Because of its important military significance, in recent years the air-breathinghypersonic cruise missile has become the research focus of world attention. However,the flight range, flight dynamics is very complex. The body/design layout engineintegration leads to the existence of strong coupling between the aerodynamic force andthe thrust of the engine, so the dynamic model of nonlinear high and strong coupling,modeling complex.In view of the above problems, this paper combined with the theory of hypersonicaerodynamics, for the power on the use of scramjet engine, adopts the structure ofairframe/engine integration design of hypersonic vehicle, this paper carried out thefollowing:First introduced several commonly used in hypersonic aerodynamic calculationmethods, including hypersonic vehicle geometry model, aerodynamic model andpropulsion system model, and provide a theoretical basis for the following analysis ofthe whole vehicle force.Then based on the piston theory of hypersonic aircraft, surface pressuredistribution and stress are analyzed, and the calculation of the stability of derivatives,the expression of air power and torque were given vehicle, dynamic characteristics ofaircraft gas was analyzed. And the use of scramjet model and the engine thrust, thrustmoment were calculated, and a preliminary analysis on engine performance.Finally, based on the hypersonic vehicle dynamics model previously established,calculated the integrated simulation of various flight conditions, combined with thesimulation data analysis of air-breathing hypersonic vehicle gas coupling characteristics.