Shock-Wave/Turbulent Boundary-Layer Interactions in Nonequilibrium Flows

Abstract

Shock-wave/turbulent boundary-layer interactions in the presence of thermal and chemical nonequilibrium phenomena are analyzed. The approach relies on a linear eddy viscosity two-equation turbulence modeling that accounts for the coupling of turbulence with chemistry and vibration, and it employs a total variation diminishing e nite volume numerical methodology. The capability of the model has e rst been assessed for a cylinder e are cone guration, and results have been compared with experiments. The model has then been applied to assess the aerodynamic performance of control surfaces of a reusable launch vehicle. In particular, the effects of wall temperature and e ap dee ection on the separation, aerothermal loads, and e ap efe ciency have been studied. The analysisshowsthatturbulencebecomesimportantfore apdee ectionanglesgreaterthanacriticalvalue[ O (15deg)], thus avoiding thecrisis of thee ap efe ciency that is observed under laminarconditions and extending the operating capabilitiesofthecontrolsurface.Thestudy also showsthatthewalltemperatureaffectssignie cantly theefe ciency and the operating envelope of the e ap primarily under turbulent conditions.