Hydrogen and ethylene self-ignition induced by oblique shock wave were investigated experimentally with incoming Mach number of 2.5. The process of initial flame kernel generation and evolvement was observed with schlieren photography and high speed camera system. The effects of total incoming temperature

fuel injection conditions

cavity length and oblique shock wave intensity on the process of self-ignition and self-ignition boundary were studied experimentally. Results reveal that the performance of self-ignition can be improved by the enhanced effect of incident oblique shock wave on local flow-field. The low speed circulation zone created in cavity is beneficial to the upstream spreading of initial flame kernel

and acts as a function of flame-holding for preventing the blow-away of formed flame caused by flow oscillation. Self-ignition can be extended by increasing the injection pressure

cavity length and total incoming temperature.