A supersonic free-jet facility (Mach number 3) capable of accom-modating full-scale ram-jet engines has been constructed arid evaluated. A 24-inch circular nozzle produces a jet of sufficiently uniform veloc-ity that a good simulation of the engine internal flow is obtained. An annular diffuser -placed around the engine recovers part of the total pressure of the jet flow passing outside the engine so that the pressure ratios which must be imposed across the facility to start and maintain the jet are kept to reasonable values.
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