An application of passive control to the shock wave boundary layer interaction in high speed intakes

Abstract

In this report results* of an experimental investigation into the application of passive control for supersonic side wall intakes have been presented. Tests are performed on a small scale supersonic intake model in an attempt to simulate the shock wavelboundary layer interaction present in a full scale configuration. A wide flush bleed slot is located in the intake duct and a tangential injection slot is situated upstream of the intake entry. The bleed and injection slots are linked by a breather passage. The use of a tangential injection slot is believed to be a novel concept in passive control. Experimental results show that for the supersonic intake model passive control be used to control the pre-entry shock position, reduce the shock interaction losses and improve intake efficiency. The use of a tangential injection slot does not appear to thicken the boundary layer at the intake entry.