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Rotary jet-thrust augmentors — the fallacy of Foa’s theory and the jet fan augmentor

Published online by Cambridge University Press:  04 July 2016

C. L. Bore
C. L. Bore*
Affiliation:
Formerly British Aerospace, Kingston
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Summary

The theory behind Foa’s rotary jet-thrust augmentor dates back to 1955, but there is a fundamental fallacy in it, which is proved by this note. When corrected, the augmentation value equals that of the static-jet augmentor.

The principles and theory of the jet-fan thrust augmentor are outlined. Thrust augmentation ratios of these will be around three times those of static-jet augmentors.

Type
Technical Note
Information
The Aeronautical Journal , Volume 97 , Issue 969 , November 1993 , pp. 328 - 331
Copyright
Copyright © Royal Aeronautical Society 1993 

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References

1. Foa, J.V. A new method of energy exchange between flows and some of its applications, Rensselaer Polytechnic Institute of Aerospace Engineering TR AE 550g, 1955.Google Scholar
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8. Bore, C.L. Some unpublished contributions to propulsion theory, Lecture to RAeS, 11 March 1992.Google Scholar