Abstract: A new coupled chemistry NS numerical method is proposed for predicting finite rate chemically reacting re entry flowfields. The governing equations are solved using the upwind TVD shock capturing scheme. For simplicity, the present study focuses on axisymmetric flows;however, subsequent extensions to three dimensional flows and /or other chemical systems are also relatively straightforward. The overall Teflon air chemical reaction model used consists of 23 species and 35 gas phase reactions.The numerical simulations are made for the complete flowfield (fore body and near wake) over blunt sphere cone. The fully converged solution and the computational results are obtained. The computed peak electron densities in the clean air flowfield agree well with experimental results.

Key words: Chemical non equilibrium viscous flows, Navier Stokes Equations, Hypersonic re-entry vehicle, TVD difference scheme