Numerical simulations and planar laser-induced fluorescence imaging results of hypersonic reactive flows

This paper shows comparisons between computational fluid dynamics (CFD) cal culations and planar laser-induced fluorescence and schlieren measurements of inert and reactive hypersonic hows around two-dimensional and axisymmetr ic bodies. In particular, both hydrogen-oxygen and methane-oxygen chemical reactions are considered for the shack-induced combustion in hypersonic flo ws. The hydrogen-oxidation mechanism consists of an existing mechanism of 8 reacting species and 19 elementary reactions. The reduced model of the met hane-oxidation mechanism is newly derived from the GRI-Mech 1.2 optimized d etailed chemical reaction mechanism, and consists of 14 species and 19 chem ical reaction steps. Both chemical reaction mechanisms are combined with a point-implicit Euler CFD code. The OH species density distributions of the present numerical calculations and imaging experiments for both mixtures ar e found to be in qualitative agreement.