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The lift on an aerofoil in grid-generated turbulence

Published online by Cambridge University Press:  14 April 2015

Shaopeng Li ,
Mingshui Li  and
Haili Liao
Shaopeng Li
Affiliation:
Research Centre for Wind Engineering, Southwest Jiaotong University, Chengdu 610031, PR China
Mingshui Li*
Affiliation:
Research Centre for Wind Engineering, Southwest Jiaotong University, Chengdu 610031, PR China Key Laboratory for Wind Engineering of Sichuan Province, Chengdu 610031, PR China
Haili Liao
Affiliation:
Research Centre for Wind Engineering, Southwest Jiaotong University, Chengdu 610031, PR China Key Laboratory for Wind Engineering of Sichuan Province, Chengdu 610031, PR China
*
†Email address for correspondence: lms\_rcwe@126.com
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Abstract

The three-dimensional effects of turbulence cannot be neglected when the spanwise wavelength of the incident turbulence is not effectively infinite with respect to the chord, which may invalidate the strip assumption. Based on three-dimensional theory, a general approach, expressed in terms of a two-dimensional Fourier transform of the correlation of the buffeting force, is proposed to identify the two-wavenumber spectrum and aerodynamic admittance of the lift force on an aerofoil. It is essential that the approach presented can be validated in wind tunnel experiments. The coherence of the lift force on an aerofoil in grid-generated turbulence is obtained by simultaneous measurements of unsteady surface pressures around several chordwise strips on a stiff sectional model, which controls the accuracy of results. For the purpose of the Fourier transform, three empirical coherence models of the lift force are presented to fit the experimental results. Compared with the linearized theory, the two-wavenumber aerodynamic admittance can describe well the pressure distribution and the pattern of energy transition in an isotropic turbulence field. Thus, the failure mechanism of the traditional strip assumption can be demonstrated explicitly. In addition, the results obtained also validate the theory proposed by Graham (Aeronaut. Q., vol. 21, 1970, pp. 182–198; Aeronaut. Q., vol. 22, 1971, pp. 83–100). The present approach can be extended to study the three-dimensionality of the buffeting force on line-like structures with arbitrary cross-configurations, such as long-span bridges and high-rise buildings.

JFM classification

Aerodynamics: Aerodynamics Turbulent Flows: Isotropic turbulence
Type
Papers
Information
Journal of Fluid Mechanics , Volume 771 , 25 May 2015 , pp. 16 - 35
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Copyright
© 2015 Cambridge University Press 

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