Numerical simulations of asymmetrical wake flows of a yawed wind turbine

Dezhi Wei, Decheng Wan, Changhong Hu

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

Active yaw angle control is one of the promising methods for wind farm power optimization, it is implemented by intentionally misaligning the upwind turbine to the incoming wind direction, as a result, the wake is deflected away from the downwind turbine, and the latter turbine can extract more energy from the un-waked flow. For an application of such an operational control, it is important to have a good knowledge about the wake characteristics by a yawed wind turbine. However, studies on the symmetry to yaw direction have not sufficiently covered until now. Hence, in this paper, numerous large eddy simulations are performed, to investigate the wake properties of wind turbines with same yaw angle magnitude but opposite directions, and to further explore the effects of asymmetry in wake steering on wind farm performance. We find that the wake shape and wake deflection magnitude are asymmetrical for positive and negative yaw angles. What’s more, clockwise and counter-clockwise upstream turbine yaw rotations do not produce equal benefits at the downstream wind turbines. More importantly, it is observed that rows of turbines compound the effects of the asymmetry in wake steering, the power gain in the positive yaw case greatly exceeds the negative one. According to the detailed analysis of the yawed turbine wake in oppositely signed yaw angles, we encourage to incorporate the effects of asymmetry in wake steering into the empirical engineering wake models used for designing wind farm controllers.

本文言語英語
ホスト出版物のタイトルProceedings of the 31st International Ocean and Polar Engineering Conference, ISOPE 2021
出版社International Society of Offshore and Polar Engineers
ページ429-435
ページ数7
ISBN(印刷版)9781880653821
出版ステータス出版済み - 2021
イベント31st International Ocean and Polar Engineering Conference, ISOPE 2021 - Virtual, Online
継続期間: 6 20 20216 25 2021

出版物シリーズ

名前Proceedings of the International Offshore and Polar Engineering Conference
ISSN(印刷版)1098-6189
ISSN(電子版)1555-1792

会議

会議31st International Ocean and Polar Engineering Conference, ISOPE 2021
CityVirtual, Online
Period6/20/216/25/21

All Science Journal Classification (ASJC) codes

  • エネルギー工学および電力技術
  • 海洋工学
  • 機械工学

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