Unsteady dynamics of wedge-induced oblique detonations under periodic inflows

Two-dimensional, wedge-induced oblique detonation waves (ODWs) subject to periodic inflow are simulated using the reactive Euler equations with a two-step induction–reaction kinetic model. The focus of this work is how unsteadiness sinusoidal density disturbance varying frequency and amplitude influences an initially established ODW structure. Three fundamental structures different transition types Mach numbers disturbed, resulting in two triple-point formations: main triple point (MTP) train points (TTP). TTP features multi-triple arising almost simultaneously traveling together, which has never been observed before. A parametric study analysis reveal that MTP derives from forced destabilization, while combined effect surface instability disturbance. Furthermore, new phenomenon degeneration for proper number amplitude. Finally, oscillation amplitudes unsteady ODWs analyzed respect disturbance, demonstrating effects type on unsteadiness.