Numerical investigation shock/vortex interaction in hypersonic thermochemical nonequilibrium flow

A numerical investigation of unsteady hypersonic shock/shock interference f lows classified by Edney (Edney, B. E., "Anomalous Heat Transfer and Pressu re Distributions on Blunt Bodies at Hypersonic Speeds in the Presence of an Impinging Shock," Aeronautical Research Inst, of Sweden, FFA Rept. 115, St ockholm, Sweden, Feb. 1968) considering the thermochemical nonequilibrium e ffect is presented. The numerical method used is composed of the fourth-ord er compact MUSCL total variational diminishing scheme, the maximum second-o rder lower-upper symmetric Gauss-Seidel scheme, and the advection upstream splitting method scheme for capturing shocks and vortices accurately. The t wo-temperature model based on the Park model (Park, C., "Two-Temperature In terpretation of Dissociation Rate Data for N-2 and O-2:" AIAA Paper 88-0458 , Jan. 1988) has taken the thermochemical nonequilibrium into consideration . The nitrogen hows under several flow conditions are calculated. The obtai ned results show that the type of the shock/shock interference is strongly dependent on the location of the impinging shock as well as the shock stand off distance. Finally, unsteady flow characteristics associated with the th ermochemical nonequilibrium effect, especially very complicated flow struct ures involving shocks, compression waves, vortices, and their interactions, are investigated and explained.