Influence of nozzle inlet Mach number on performance of scramjet nozzle

The RNG k-e turbulence models and finite volume method were used to solve the conservative Reynolds-averaged Navier-Stokes equations and simulate the flow field and performance of the scramjet asymmetric ramp-nozzle designed with multi-target optimization method.The characteristics of the nozzle were numerically studied under the condition of various nozzle inlet Mach number.The simulation result shows that the variation of the nozzle inlet Mach number may influence the internal flow parameter of the nozzle,the increased or reduced inlet Mach number leads to up or down in thrust and lift force simultaneously,and maybe affects the stabilization of hypersonic air vehicle.