Abstract
We report qualitative planar laser-induced fluorescence (PLIF) imaging experiments of supersonic reactive flows over a wedge test-body in an expansion tube. Both hydrogen-based and ethylene-based reactive mixtures were investigated in this work. Ongoing facility characterization efforts investigated three different freestream conditions, Moo = 6.7, 5.2, and 4.2. These conditions were used in an initial investigation of combustion modes around a 40°half-angle wedge. In several cases, shock-induced combustion was observed a finite distance behind the non-reacting oblique shock wave. However, in the case of the most sensitive mixture, an oblique detonation wave was observed in which the shock wave and combustion front were fully coupled.
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