841. Design and Experimental Studies of a Thrust Deflector for VTOL Direct Lift Engines

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Title841. Design and Experimental Studies of a Thrust Deflector for VTOL Direct Lift Engines
Publication TypeConference Paper
Paper Number0841
Year of Publication1970
AuthorsMigdal, D.
Paper Category24. WEIGHT ENGINEERING - SYSTEM DESIGN
Conference29th Annual Conference, Washington, D. C., May 4-6
Conference LocationWashington, DC
PublisherSociety of Allied Weight Engineers, Inc.
Date Published5/4/70
Abstract

Design and experimental studies were conducted on a thrust deflector applicable to fuselage mounted lift engines installed in a VTOL aircraft. It was assumed that the equivalent of 60° (-15° to +45°) of total deflection will be required and that an aerodynamically smooth external surface is necessary for high speed forward flight. With these requirements, a two-dimensional external flap deflector, integral with the fuselage, was investigated. The flap was designed as an isentropic plug nozzle, with a hinge point slightly downstream of the throat. Massflow, shadowgraph, pressure and force data were obtained. The shadowgraph and pressure data indicated that for all positive deflections (0 to 45°) the flow could be deflected in a very short length via a low loss shock system. For negative deflections an efficient coanda effect was obtained. The experimental data indicate that a single three-dimensional external flap deflector is an efficient device for thrust vectoring of aft engines.

Pages27
Key Words24. Weight Engineering - System Design
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