Flow field characteristics of isolator with fluidic injection

Abstract The present work investigates the effect of secondary fluidic injection on the flow-physics of a supersonic stream within an isolator. An isolator with a length-to-height ratio of 4.5 and an entry Mach number of 2 was chosen for this investigation. The experimental investigations were conducted at a nozzle pressure ratio of 4 and at secondary pressure ratios of 0.75, 1, 1.25 and 1.5. The secondary stream was injected at 0.75 times the length of the isolator, from its inlet. It is inferred that the extent of propagation of disturbances increases with secondary pressure ratio. The single-sided injection causes asymmetry between the pressure distributions along the wall of injection and its opposite side.