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A Mixing Theory for the Hovering of Peripheral-Jet Air Cushion Vehicles

Published online by Cambridge University Press:  04 July 2016

L. J. S. Bradbury
L. J. S. Bradbury*
Affiliation:
Aeronautics Department, Imperial College, London
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Extract

Recently Alexander suggested modifications to the inviscid theory of Stanton Jones for improving the agreement between theory and experiment on the cushion pressure of hovercraft. However, these simple inviscid theories can hardly be expected to represent even approximately the behaviour of peripheral jets in hovercraft and a more plausible theory taking mixing into account can easily be developed from some work of Bourque and Newman on the re-attachment of plane jets to adjacent surfaces. This theory, which is somewhat similar to a theory of Chaplin, can be used to predict the behaviour of peripheral jet models both in and out of ground effect but it is the intention here simply to compare the predictions of the mixing theory in ground effect with the simple inviscid theories which seem so commonly used in cushion craft work. Also, the advantages and potential of the mixing theory will be discussed briefly.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 71 , Issue 673 , January 1967 , pp. 53 - 54
Copyright
Copyright © Royal Aeronautical Society 1967

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References

1.Alexander, A. J.The Momentum Equation—for a Static Hovercraft at Zero Incidence. Journal of the Royal Aeronautical Society, Vol. 70, p 363, February 1966.CrossRefGoogle Scholar
2.Stanton Jones, R. The Development of the Saunders-Roe Hovercraft SRN 1. Symposium on Ground Effect Phenomena, Princeton University, October 1959.Google Scholar
3.Bourque, C. and Newman, B. G.Re-attachment of a Two-dimensional Incompressible Jet to an Adjacent Flat Plate. Aeronautical Quarterly, Vol. XI, August 1960.Google Scholar
4.Chaplin, H. R. The Effect of Jet Mixing on the Annular Jet. David Taylor Model Basin Report 1375, 1959.Google Scholar