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A Note on the Induced Drag of Jet-Flapped Wings

Published online by Cambridge University Press:  04 July 2016

G. K. Korbacher  and
K. Sridhar
G. K. Korbacher
Affiliation:
Institute of Aerophysics, University of Toronto
K. Sridhar
Affiliation:
Institute of Aerophysics, University of Toronto
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Extract

The main purpose of this note is to explain the apparent discrepancy which arises when the change in effective aspect ratio due to blowing, as predicted by the theoretically derived expression for the induced drag coefficient, is compared with what one intuitively expects from the general flow picture. If the jet sheet is considered as a chordwise extension of the wing (mechanical flap analogy), the general flow picture suggests that the effective aspect ratio of a wing without blowing is reduced by blowing. Maskell and Spence's relation for the induced drag coefficient, however, indicates that the effect of jet blowing is to increase the effective aspect ratio.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 64 , Issue 593 , May 1960 , pp. 290 - 291
Copyright
Copyright © Royal Aeronautical Society 1960

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References

1.Maskell, E. C. and Spence, D. A. (1958). A Theory of the Jet Flap in Three Dimensions. R.A.E. Rep. Aero 2612, September 1958.Google Scholar
2.Helmbold, H. B. (1957). Theory of Finite-Span Blowing Wing. Journal of the Aeronautical Sciences, Vol. 24, No. 5, pp. 339–344, May 1957.CrossRefGoogle Scholar
3.Korbacher, G. K., and Sridhar, K. (1959). A Review of the Jet Flap. U.T.I.A. Review No. 14, December 1959.Google Scholar