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A correlation indicating incipient dynamic stall

Published online by Cambridge University Press:  04 July 2016

M. W. Gracey ,
A. J. Niven ,
F. N. Coton ,
R. A. McD. Galbraith  and
D. Jiang
M. W. Gracey
Affiliation:
Department of Aerospace Engineering, University of GlasgowGlasgow, UK
A. J. Niven
Affiliation:
Department of Aerospace Engineering, University of GlasgowGlasgow, UK
F. N. Coton
Affiliation:
Department of Aerospace Engineering, University of GlasgowGlasgow, UK
R. A. McD. Galbraith
Affiliation:
Department of Aerospace Engineering, University of GlasgowGlasgow, UK
D. Jiang
Affiliation:
Department of Aerospace Engineering, University of GlasgowGlasgow, UK
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Abstract

This paper proposes a correlation which attempts to relate an aerofoil's low speed dynamic stall onset incidence to particular parameters describing its stall behaviour in steady conditions. These parameters, which can be derived from experiment or predictive algorithm, are the incidence of steady stall and a term related to trailing-edge separation characteristics. The correlation is based on a large amount of data obtained from a number of aerofoils broadly classified into two families: the NACA four digit series of symmetrical sections and a family of four profiles with the NACA 23012 as the generic shape.

The correlation has been extended to low pitch rates outside the “deep” dynamic stall range and, whilst it pertains to stalling under ramp motions, a link has been established with oscillatory motions. The potential of the correlation is demonstrated by its application to the design of a symmetric aerofoil for use on wind turbines.

Type
Research Article
Information
The Aeronautical Journal , Volume 100 , Issue 997 , September 1996 , pp. 305 - 311
Copyright
Copyright © Royal Aeronautical Society 1996 

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Footnotes

+

Currently with Westland Helicopters, Yeovil, Somerset

†

Currently Lecturer, The University of Paisley, Scotland

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