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The lift on an airfoil at various angles of attack in turbulent flow

Published online by Cambridge University Press:  09 May 2025

Yongfei Zhao Open the ORCID record for Yongfei Zhao [Opens in a new window] ,
Yang Yang Open the ORCID record for Yang Yang [Opens in a new window]  and
Mingshui Li Open the ORCID record for Mingshui Li [Opens in a new window]
Yongfei Zhao
Affiliation:
Research Center for Wind Engineering, Southwest Jiaotong University, Chengdu 610031, PR China
Yang Yang*
Affiliation:
Research Center for Wind Engineering, Southwest Jiaotong University, Chengdu 610031, PR China Key Laboratory for Wind Engineering of Sichuan Province, Chengdu 610031, PR China
Mingshui Li
Affiliation:
Research Center for Wind Engineering, Southwest Jiaotong University, Chengdu 610031, PR China Key Laboratory for Wind Engineering of Sichuan Province, Chengdu 610031, PR China
*
Corresponding author: Yang Yang, [email protected]
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Abstract

The lift aerodynamic admittances of an airfoil at different angles of attack (AoAs) in turbulent flow are investigated using a combination of theoretical and experimental approaches. Two theoretical one-wavenumber aerodynamic admittances, namely the Sears and Atassi functions, are reviewed and uniformly normalized for comparison with experimental results. In theory, generalized aerodynamic admittances are generated by introducing the spanwise influence into one-wavenumber aerodynamic admittances. The influence of AoA on generalized aerodynamic admittance includes its effect on both the spanwise influence term and one-wavenumber aerodynamic admittances. The experiment indicates that prior to the prestall region, the increase in the spanwise influence factor correlates with the increase in AoA, with the growth rate of the spanwise influence factor likewise accelerating. The Atassi functions demonstrate that the influence of AoA on one-wavenumber aerodynamic admittances is based on the assumption of full correlation in the spanwise direction. Experimental results suggest that one-wavenumber aerodynamic admittances are inapplicable to actual turbulence; however, the Atassi function accurately represents experimental values at the corresponding AoA when taking into account the spanwise effects.

JFM classification

Aerodynamics: Flow-structure interactions
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 1010 , 10 May 2025 , A45
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Copyright
© The Author(s), 2025. Published by Cambridge University Press

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