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ISSN 0254-0096 CN 11-2082/K

太阳能学报 ›› 2022, Vol. 43 ›› Issue (10): 210-217.DOI: 10.19912/j.0254-0096.tynxb.2021-0343

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NACA0018翼型锯齿格尼襟翼尾迹特征的Liutex分析

于永迪1, 陈榴1,2, 郑哲辉1, 戴韧1   

  1. 1. 上海理工大学能源与动力工程学院,上海 200093;
    2. 上海市动力工程多项流动与传热重点实验室,上海 200093
  • 收稿日期:2021-04-01 出版日期:2022-10-28 发布日期:2023-04-28
  • 通讯作者: 陈榴(1983——),女,博士、副教授,主要从事风力机空气动力学方面的研究。chen_liu@usst.edu.cn
  • 基金资助:
    国家自然科学基金(52006147)

EFFECT OF SERRATED GURNEY FLAP ON NACA0018 AIRFOIL WAKE WITH LIUTEX IDENTIFICATION METHOD

Yu Yongdi1, Chen Liu1,2, Zheng Zhehui1, Dai Ren1   

  1. 1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
    2. Shanghai Key Laboratory of Multiphase flow and Heat Transfer in Power Engineering, Shanghai 200093, China
  • Received:2021-04-01 Online:2022-10-28 Published:2023-04-28

摘要: 在雷诺数Re=1.38×105时,采用实验测量对比研究NACA0018原始翼型以及带有格尼襟翼和齿形襟翼翼型的尾迹涡结构,对比锯齿襟翼与格尼襟翼的控制机理。结果表明,在小攻角下,锯齿襟翼较格尼襟翼大大降低尾迹速度亏损,但速度偏转小于格尼襟翼。通过Liutex分析发现气流经过锯齿襟翼后产生了对涡结构,与襟翼固有的流向涡掺混耗散,削弱由于流向涡引起的尾流不稳定性,从而减小翼型的阻力。对比齿形结构不同位置处的流动表明,在尾缘附近,速度偏转角从齿根,齿中到齿尖依次增加,对于远场的尾迹,3个截面的流动一致。

关键词: 风力机, 流动控制, 尾迹涡, 锯齿格尼襟翼, Liutex

Abstract: The wake flow of a NACA0018 airfoil is analyzed at the Reynolds number of 1.38×105 in a wind tunnel experiment to investigate the effect of a serrated Gurney flap. The wake structures of a serrated flap and a conventional fully spanned flap are compared to elucidate the flow control mechanism of serrated flap. Results show that the wake loss due to velocity deficit is obviously lower for the serrated flap at a small attack angle while the flow deflection gets reduced. A pair of counter-vortex is found with the Liutex identification method in the flow through the serrated flap, which gets mixed dissipation with the inherent streamwise vortex generated by the flap. It reduces the wake instability caused by the streamwise vortex and hence the resistance of the airfoil. Comparison of the flow at different tooth positions near the trailing edge shows an increase of velocity deviation angle from the tooth root to tip, For the far-field wake, the flow of the three sections is consistent.

Key words: wind turbines, flow control, vortex, serrated Gurney flap, Liutex

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