On the S809 airfoil's unsteady aerodynamics characteristics

Sheng, W., Galbraith, R. and Coton, F. (2009) On the S809 airfoil's unsteady aerodynamics characteristics. Wind Energy, 12(8), pp. 752-767. (doi:10.1002/we.331)

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The S809 airfoil dynamic characteristics, which are based on the airfoil dynamic tests at the University of Glasgow, are presented in this paper. The airfoil tests include static, ramp-type (ramp-up and ramp-down) and oscillatory motions at Reynolds numbers of 1.0 × 106 and 1.5 × 106 with and without the sand-tripped leading edge. This study aimed to explore the unsteady aerodynamic features of the S809 airfoil, such as the progression of separation from leading edge to trailing edge, the large trailing edge separation before stalling, the stall onset inception and the re-attachment convection, and to provide some useful data for tuning/refining the semi-empirical dynamic stall (DS) models, such as the Leishman–Beddoes DS model or its variations. Experimental results show that the S809 airfoil has a complicated DS process that renders this airfoil a challenge for any modeller of the unsteady airloads. The leading-edge roughness has small effect on the static features, but significantly invokes earlier stall onset inception under dynamic conditions, while has small influence on the convective phase of the re-establishment of fully attached flow.

Item Type:Articles
Keywords:S809, unsteady aerodynamics, dynamic stall
Glasgow Author(s) Enlighten ID:Galbraith, Professor Roderick and Coton, Professor Frank
Authors: Sheng, W., Galbraith, R., and Coton, F.
Subjects:T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Research Group:Aerospace sciences
Journal Name:Wind Energy
ISSN (Online):1099-1824
Published Online:15 April 2009

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