Investigation of Two-Dimensional Cavity Diffusers,

Abstract : An investigation was conducted to determine the flow regimes and performance of 2-D cavity diffusers. Water table flow visualization tests were conducted over a wide range of diffuser divergence angles and diffuser length to throat-width ratios. Air flow tests were conducted from Mach numbers of .06 to .6 on a 1/3 scale model to obtain diffuser performance. Results indicate that a single cavity can delay separation in 2-D straight wall diffusers, but that static pressure recovery is reduced. In both tests self-induced resonance was encountered which can be reasonably predicted by a vortex wave interaction model. (Author)