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An Approximate Theoretical Approach for the Determination of Oscillatory Aerodynamic Coefficients for a Helicopter Rotor in Forward Flight

Published online by Cambridge University Press:  07 June 2016

W. G. Molyneux
W. G. Molyneux*
Affiliation:
Royal Aircraft Establishment, Farnborough
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Summary

A method is described for the determination of the oscillatory aerodynamic coefficients for a helicopter rotor in forward flight. The method treats the blades and the recirculating wakes on a three-dimensional basis, but certain approximations are made so that the problem is tractable. In particular it is assumed that the downwash effect of a wake sheet beneath the rotor can be represented by concentrating the doublet distribution in the sheet in a single line of doublets.

Type
Research Article
Information
Aeronautical Quarterly , Volume 13 , Issue 3 , August 1962 , pp. 235 - 254
Copyright
Copyright © Royal Aeronautical Society. 1962

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References

1. Jones, J. P. The Influence of the Wake on the Flutter and Vibration of Rotor Blades. A.R.C. 18,173, January 1956.Google Scholar
2. Willmer, M. A. P. The Loading of Helicopter Rotor Blades in Forward Flight. A.R.C. 21,233, April 1959.Google Scholar
3. Jones, W. P. Aerodynamic Forces on Wings in Non-Uniform Motion. R. & M. 2117, August 1945.Google Scholar
4. Jones, W. P. and Skan, S. W. Calculations of Derivatives for Rectangular Wings of Finite Span by Cicala's Method. R. & M. 1920, January 1940.Google Scholar
5. Jones, W. P. The Calculation of Aerodynamic Derivative Coefficients for Wings of Any Planform in Non-Uniform Motion. R. & M. 2470, December 1946.Google Scholar
6. Reissner, E. Effect of Finite Span on the Airload Distributions for Oscillating Wings. I—Aerodynamic Theory of Oscillating Wings of Finite Span. N.A.C.A. T.N. 1194, March 1947. Reissner, E. and Stevens, J. E. Effect of Finite Span on the Airload Distributions for Oscillating Wings. II—Methods of Calculation and Examples of Application. N.A.C.A. T.N. 1195, October 1947.Google Scholar
7. Williams, D. E. The Effect of Wing-Tailplane Aerodynamic Interaction on Tail Flutter. R. & M. 3065, February 1955.Google Scholar
8. De haan, Bierens. Nouvelles Tables d'Integrales Definies Strechert, New York, 1939.Google Scholar
9. Loewy, R. G. A Two-Dimensional Approximation to the Unsteady Aerodynamics of Rotary Wings. Journal of the Aeronautical Sciences, Vol. 24, February 1957.CrossRefGoogle Scholar
10. Silveira, M. A. and Brooks, G. W., Dynamic-Model Investigation of the Damping of Flapwise Bending Modes of Two-Blade Rotors in Hovering and a Comparison with Quasi-Static and Unsteady Aerodynamic Theories. N.A.S.A. T.N. D-175, December 1959.Google Scholar
11. Jones, J. P. A Note on the Determination of Rotor Blade Motion in Forward Flight. A.R.C. 22,009, June 1960.Google Scholar