High-Speed Imaging Of The Dynamics Of H2/O2 Ignition At Low To Moderate Temperatures In A Shock Tube

In this study, ignition delay times and high-speed images were taken behind reflected shockwaves during hydrogen oxygen ignition. Experimental conditions were temperatures between 858-1082K and pressures between 2.74-3.91atm for a 15%H2/18%O2/Ar mixture. Experiments were conducted in both a clean and dirty shock tube. Ignition delay times showed no significant deviations between these two types of tests, but endwall image sequences conducted in a dirty facility showed a large amount of dirt and soot particulates, clouding the images during preignition. The high concentration mixture exhibited strong pre-ignition ramp behavior at temperatures \u3c1000K over the temperature and pressure ranges studied. Several of the runs conducted with the high concentration mixture exhibited a deflagration to detonation transition. Current high-speed results for ignition delay times confirm previous literature studies conducted using without imaging and chemical kinetic modeling