Hostname: page-component-78c5997874-lj6df Total loading time: 0 Render date: 2024-11-06T07:48:21.462Z Has data issue: false hasContentIssue false
  • English
  • Français

Some Simple Results for Two-Dimensional Jet-Flap Aerofoils

Published online by Cambridge University Press:  07 June 2016

D. A. Spence
D. A. Spence*
Affiliation:
Royal Aircraft Establishment, Farnborough
Get access

Summary

It is shown from elementary considerations that the lift coefficient of a thin two-dimensional wing at zero incidence, with a narrow high-velocity jet of momentum coefficient Cj issuing from its trailing edge at a (small) downward inclination τ, is given by

and the loading on the chord line (0<x<1) by

(except in a certain neighbourhood of the trailing edge), for small values of Cj. These formulae agree well with known measurements. Interpolation formulae for derivatives of CL at larger values of CJ based on earlier work, are also given:

Type
Research Article
Information
Aeronautical Quarterly , Volume 9 , Issue 4 , November 1958 , pp. 395 - 406
Copyright
Copyright © Royal Aeronautical Society. 1958

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

l. Davidson, I. M. The Jet Flap. Journal of the Royal Aeronautical Society, Vol. 60, January 1956.CrossRefGoogle Scholar
2. Woods, L. C. On the Thrust due to an Air Jet Flowing from a Wing Placed in a Wind Tunnel. Journal of Fluid Mechanics, Vol. 1, pp. 54–60, 1956.Google Scholar
3. Woods, L. C. A Note on the Integro-Differential Equation of Jet-Flap Theory. A.R.C. Report 18, 980, 1956.Google Scholar
4. Spence, D. A. The Lift Coefficient of a Thin Jet-Flapped Wing. Proc. Roy. Soc, Vol. A 238, 1956-57.Google Scholar
5. Stratford, B. S. Early Thoughts on the Jet Flap. The Aeronautical Quarterly, Vol VIII, February 1956.Google Scholar
6. Von Kármán, Th. and Burgers, J.M. Aerodynamic Theory (Ed. Durand, W. F.). Springer, Berlin, Vol. II, p. 52, 1935.Google Scholar
7. Glauert, H. Theoretical Relationships for an Aerofoil with Hinged Flap. R. & M. 1095, 1927.Google Scholar
8. Dimmock, N. A. Unpublished M.O.S. Report, .Google Scholar