The Effects of Chemical Nonequilibrium and Surface Catalyticity on Aerothermodynamic characteristics of Hypersonic Vehicles

摘要

The vehicle in hypersonic flight will experience high temperature effects, including chemical nonequilibrium and surface catalyticity, which make its aerothermodynamic charcteristics different The accuracy of predicting the aerodynamic forces and heat flux contributes to improve the vehicles' flight stability and control precision. In view of the vehicle configuration with a cruciform tail, numerical study is conducted by using a HyCFD code, which solves three dimensional Navier-Stokes equations with chemical source terms of multi-species based on an AUSMPW+ scheme coupling with implicit LU-SGS method. A systematic investigation analyzes the variation of heat flux and force coefficients with various gas properties and surface catalysis models. The results demonstrate that the chemical nonequilibrium effect greatly affects the aerothermodynamics, while surface catalyticity exhibits negligible effect.