Recent Developments in Ejector Design for V/STOL Aircraft 841498
Two categories of ejector design have been investigated at de Havilland Aircraft of Canada:
Trailing edge ejector flap for augmentation of wing lift by supercirculation: primarily for STOL transport type aircraft of high aspect ratio.
Chordwise rectangular ejector located adjacent to the fuselage sides for vertical lift: primarily for STOVL combat type aircraft of low aspect ratio.
The paper reviews the underlying physical principles of the ejector type of thrust augmentor and suggests a logical procedure for development and optimization by experimental means. Methods of data analysis are shown which provide the foundation for empirical design and some examples of performance are given for each of the two ejector categories defined above. In addition, a new form of primary nozzle is described which serves to distribute the jet and promote fast mixing in the ejector throat.