Investigation at Mach number 1.88 of half of a conical-spike diffuser mounted as a side inlet with boundary-layer control

Fred H. Goelzer, Edgar M. Cortright, Jr.
naca-rm-e51g06
Sep 1951


Experimental investigation was conducted at Mach number 1.88 to determine performance characteristics of half a 50 degree-conical-spike inlet mounted on a flat plate. Initial boundary layer was removed up-stream of inlet by a ram-type scoop of variable height. Initial boundary-layer thickness was also varied. With complete removal of initial boundary layer, total-pressure recovery of approximately 70 percent. Several alternative boundary- layer-removal systems were investigated which decreased the adverse effect of operating the ram scoop sub-critically.

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