PSP Measurement of Flowfields in a Supersonic Combustor with Backward-Facing Step

Abstract

The Pressure sensitive paint (PSP) technique was used to visualize the continuous surface oxygen concentration field around a sonic jet injected transversely into a supersonic freestream of Mach 2.4. The jet-to crossflow dynamic pressure ratios of approximately 0.7 was examined. The visualized flow field showed high concentration regions of the bow shock waves between the injectors affects the spreading and behavior of the horseshoe vortices, and the horseshoe vortices downstream of the injectors affect the surface oxygen concentration field.