Development of Lift Ejectors for STOVL Combat Aircraft 872324

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.


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