Pressure recovery, drag, and subcritical stability characteristics of three conical supersonic diffusers at stream Mach numbers from 1.7 to 2.0

Nussdorfer, Theodore J., Obery, Leonard J., Englert, Gerald W.

A study of a 20 degree and a 25 degree half-angle high mass-flow ratio conical supersonic inlet was made on a 16-inch ram jet in the 8- by 6-foot supersonic tunnel. A greater range of stable subcritical operation was obtained with the low mass-flow ratio inlets; a greater range was obtained with the 25 degree than with the 20 degree half-angle low mass-flow ratio inlet. The high mass-flow ratio inlet had the least drag.

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