Investigation into Yaw Motion Influence of Horizontal-Axis Wind Turbine on Wake Flow Using LBM-LES

Weimin Wu, Xiongfei Liu, Jingcheng Liu, Shunpeng Zeng, Chuande Zhou and Xiaomei Wang
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Weimin Wu: School of Mechanical and Power Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Xiongfei Liu: Xinjiang Branch, Chinese Academy of Sciences, Urumqi 830011, China
Jingcheng Liu: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Shunpeng Zeng: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Chuande Zhou: School of Mechanical and Power Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Xiaomei Wang: School of Mechanical and Power Engineering, Chongqing University of Science and Technology, Chongqing 401331, China

Energies, 2021, vol. 14, issue 17, 1-37

Abstract: The dynamic yaw motion of the wind turbine will affect the overall aerodynamic performance of the impeller and the corresponding wake flow, but the current research on this issue is inadequate. Thus, it is very necessary to study the complicated near-wake aerodynamic behaviors during the yaw process and the closely related blade aerodynamic characteristics. This work utilized the multi-relaxation time lattice Boltzmann (MRT-LBM) model to investigate the integral aerodynamic performance characteristics of the specified impeller and the dynamic changes in the near wake under a sine yawing process, in which the normalized result is adopted to facilitate data comparison and understanding. Moreover, considering the complexity of the wake flows, the large eddy simulation (LES) and wall-adapting local eddy-viscosity (WALE) model are also used in this investigation. The related results indicate that the degree of stability of tip spiral wake in the dynamic yaw condition is inversely related to the absolute value of the change rate of yaw angular speed. When the wind turbine returns to the position with the yaw angle of 0 (deg) around, the linearized migration of tip vortex is changed, and the speed loss in the wake center is reduced at about the normalized velocity of 0.27, and another transverse expansion appeared. The directional inducing downstream of the impeller sweep surface for tip vortex is clearly reflected on the entering side and the exiting side. Additionally, the features of the static pressure on the blade surface and the overall aerodynamic effects of the impeller are also discussed, respectively.

Keywords: wind turbine; near wake; MRT-LBM; overall aerodynamic performance; dynamic yaw; complicated flow CFD (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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