As for the ignition process at the inflow conditions of Mach 2.1 with stagnation temperature of 846K and pressure of 0.7MPa high speed photography was used to observe the ethylene ignition experiments with the active cavity injection. Based on the high speed photography image synthesis and statistical analysis

a new method for analyzing the cavity flame stabilization and the flame distribution quantitatively was proposed. At the overall equivalent ratio of 0.15 and 0.17(the active injection equivalent ratio of 0.04 and 0.06 correspondingly)

the ignition process of the scheme using ramp injection and the scheme using a combined parallel and ramp injection were compared by applying this method. Besides

the cavity flame stabilization and the flame distribution of the ignition schemes were investigated in quantitatively. At the active equivalent ratio of 0.04

the local pressure feedback is weak and the flame exists in a discontinuous form. At the active equivalent ratio of 0.06

the flame distribution of the combustor is more even. As for the ignition process transient images in a supersonic flow

qualitative and quantitative analysis could be made effectively by using this method.