Ejector Ram Drag,
GENERAL DYNAMICS FORT WORTH TX FORT WORTH DIV
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Ejectors are a means of providing thrust augmentation for STOL and VTOL flight while minimizing ground impact and inlet reingestion problems. However, for some ejector configurations, experiments have indicated that axial thrust recovery is not effective in off-setting ejector ram drag so that such systems may encounter difficulties transitioning from engine-borne to wing-borne flight. This paper presents an analytical method of predicting this drag using empirical ejector performance parameters. A comparison between the theory and ram drag measurements from NASA Wind Tunnel Tests is presented.