Some Effects of Inlet Blockage and Aspect Ratio on Diffuser Performance

Pressure Recovery Performance of Straight-Channel, Single-Plane Divergence Diffusers at High Mach Numbers

“…The data obtained by Johnston and Powars (1967) were taken at L/W 1 6.0 and, unfortunately, do not lie within the range of geometries covered by the present aspect ratio data. However, the aspect ratio 0.25 data do include L/W1 = 7 recovery information which is felt to be close enough to the data of Johnston and Powars to permit a quite reasonable extrapolation.…”

“…The only data for whici blockage information is availableare that contained in the performance maps of Reneau, et al (1964),and the low aspect ratio data of Johnston and Powars (1967).…”

“…Table X is a comparison of some independent data by Johnston and Powars (1967) at low aspect ratio. Again the data are compared on the basis of an "equivalent length" and the true geometric area ratio since their data are for incompressible flow.…”