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Development of Lift Ejectors for STOVL Combat Aircraft
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English
Abstract
This paper reviews ejector development at DHC over the past 25 years and focuses on the features proposed for the E7 wind tunnel model. The E7 aircraft is a STOVL project study design by General Dynamics, Fort Worth, which utilizes lift ejector technology developed by DHC (Ref. 1).
Efforts to maximize thrust augmentation ratio within the packaging constraints of typical STOVL aircraft configurations are described.
Experimental results from antecedents of the E7 ejector are presented together with the latest results from full-scale tests at Lewis Research Center, NASA. The major geometrical parameters are described and their influence on thrust augmentation evaluated. Various nozzle types are discussed. Performance is compared with theoretical trends derived from global compressible theory.
A brief look at the installation aerodynamics of a pair of chordwise ejectors, in hover, completes the paper.
Citation
Garland, O., "Development of Lift Ejectors for STOVL Combat Aircraft," SAE Technical Paper 872324, 1987, https://doi.org/10.4271/872324.Also In
References
- Foley, W.H. Sheridan, A.E. Smith, C.W. “Study of Aerodynamic Technology for Single-Cruise-Engine V/STOL Fighter / At tack Aircraft” NASA CR166268 February 82
- Hedges, K.R. Hill, P.G. “Compressible Flow Ejectors - Part I and II” Journal of Fluid Engineering 272 September 1974
- McClintock, F.A. Hood, J.H. “Aircraft Ejector Performance” Journal of the Aeronautical Sciences 13 11 559 November 1946
- Quinn, B. “Recent Developments in Large Area Ratio Thrust Augmentors” AIAA Paper No. 72-1174 December 1972
- Aoyagi, K. Aiken, T.N. “Wind Tunnel Investigation of a Large-Scale VTOL Aircraft Model with Wing Root and Wing Thrust Augmentors” NASA TM 78589 Sept. '79
- Garland, D.B. “Phase 4 Static Tests of the J-97 Powered, External Aug-mentor V/STOL Model at NASA. Ames Research Center” NASA CR 177395 December '85
- Quinn, B. “Ejector Performance at High Temperatures and Pressures” J. Aircraft 13 12 December 1976
- Lund, T.S. Tavella, D.A. Roberts, L. “Analysis of Interacting Dual Lifting Ejector Systems” AIAA Paper No. 86-0478 January 1986