Structure of Oblique Shock to Oblique Detonation Transition with an Inert Near Wall Layer

Oblique detonation waves are studied using high-fidelity numerical simulations for H2 Air using detailed chemical kinetics. Previous work has focused on detonation wave structure, dynamics, and stability with a uniform premixed inflow. To understand the impact of reactivity changes in the near-wall region on the OSW-ODW transition structure and stability. To evaluate this, an inert layer is introduced in the near-wall region. The OSW to ODW transition occurs with a similar structure both with and without the inert layer present. The OSW to ODW transition takes longer to occur with increasing inert layer height. The reason for this is due to the boundary layer separation occurring later, delaying and reducing the OSW shock strengthening. While the OSW to ODW transition occurs later with increasing inert layer height, the transition does occur, and the wall-based confinement is not critical for stabilizing the OSW to ODW transition.