Numerical studies on weak and strong ignition induced by reflected shock and boundary layer interaction

In shock tube experiments, the interaction between reflected and boundary layer can induce bifurcation weak ignition. The ignition greatly affect delay time measurement in a experiment. this work, two-dimensional simulations considering detailed chemistry transport are conducted to investigate non-uniform behind shock. objectives interpret formation of induced by its transition strong for both hydrogen dimethyl ether. It is found that reflection incident at end wall produces wedge-shaped oblique foot wall. structure results interactions layer, which induces bifurcation. demonstrated local high-temperature spots bifurcated caused viscous dissipation pressure work. As post-reflected temperature increases, from stoichiometric hydrogen/oxygen mixture observed. relative sensitivity introduced characterize appearance Unlike mixture, not observed dimethylether/oxygen since it has relatively longer smaller sensitivity.