An investigation has been made of a Jet diffuser designed to utilize the kinetic energy of the Jet from a turbojet engine to reduce the discharge pressure at the exhaust nozzle and thereby to provide simulated ram-pressure ratios across the engine and altitudes. The Jet diffuser, designed for use with a turbojet engine haying an12—inch-diameter exhaust nozzle consists of an exhaust chamber, a diffuser-inlet nozzle, a straight 10-inch-long throat, and a diffuser section followed by a 4-foot straight duct. At any engine speed, the pressure in the exhaust chamber may be regulated by a variablearea shutter at the diffuser outlet.
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