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Title:
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Stall coefficients : aerodynamic airfoil coefficients at large angles of attack
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Author(s):
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Published by:
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Publication date:
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ECN
Wind Energy
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1-1-2001
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ECN report number:
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Document type:
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ECN-RX--01-004
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Conference Paper
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Number of pages:
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Full text:
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18
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Download PDF
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Presented at: Annual IEA symposium on the aerodynamics of wind turbines, NREL, USA, 4-5 december 2000.
Abstract:
For the structural design of wind turbines the aerodynamic loads on the rotor blades must be known under all conditions. For parked conditions or the state with failed control mechanism, the wind can hit the blades with various angles of attack. From research for aerospace applications measured coefficients are available for angles of attack only up to stall. For larger angles of attack some empirical expressions are presented in this document, based on the assumption that the flow on one side of the airfoil is fully separated. The geometry of the upwind side of the airfoil is described in a limited set of parameters. With these parameters and with the aspect ratio of the complete rotor blade, empirical relations are obtained from measured data from various sources. These expressions are written in the program 'StC' which stands for Stall Coefficients. 20 refs.
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