NASA-TN-D-523

Abstract

An investigation has been made in the Mach 3.5 blowdown jet of the Langley High-Temperature Fluid Mechanics Section of the flow in a rectangular cavity in a flat plate. The results indicate that a critical value of the ratio of depth to chord length existed between 0.093 and 0.146 such that the pressure distribution in the cavity was very sensitive to depth changes for ratios of depth to chord length less than the critical value and was insensitive to depth changes for ratios of depth to chord length greater than the critical value. Span variations had large effects on the pressure distribution only in the narrow cavities (cavities having ratios of span to chord length less than 0.25) at the moderately shallow depth (ratio of depth to chord length equal to 0.093). Varying the upstream and downstream lip radii caused large changes in the pressure distribution only in the moderately wide (ratio of span to chord length equal to 0.75), moderately shallow cavity.