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841. Design and Experimental Studies of a Thrust Deflector for VTOL Direct Lift Engines
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Title | 841. Design and Experimental Studies of a Thrust Deflector for VTOL Direct Lift Engines |
Publication Type | Conference Paper |
Paper Number | 0841 |
Year of Publication | 1970 |
Authors | Migdal, D. |
Paper Category | 24. WEIGHT ENGINEERING - SYSTEM DESIGN |
Conference | 29th Annual Conference, Washington, D. C., May 4-6 |
Conference Location | Washington, DC |
Publisher | Society of Allied Weight Engineers, Inc. |
Date Published | 5/4/70 |
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. |
Pages | 27 |
Key Words | 24. Weight Engineering - System Design |
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