Generation and Propagation Characteristics of an Auto-Ignition Flame Kernel Caused by the Oblique Shock in a Supersonic Flow Regime

The auto-ignition caused by oblique shocks was investigated experimentally in a supersonic flow regime, with the incoming at Mach number of 2.5. transient characteristics shock evolvements were recorded schlieren photography system, and initial flame kernel generation subsequent propagation using high-speed camera. fuel mixing captured NPLS (nanoparticle-based planar laser scattering method). This work aimed to reveal spread mechanism regime. effects airflow total temperature, injection pressure, cavity length process on auto-ignitable boundary analyzed. From this work, it found that occurrence is first induced then propagated upstream recirculation region, establish sustained flame. performance can be improved increasing pressure temperature. In addition, long has benefits controlling from state state. low-speed recirculating region created beneficial for spread, which function flame-holding prevents being blown away.