NACA0018翼型锯齿格尼襟翼尾迹特征的Liutex分析

于永迪; 陈榴; 郑哲辉; 戴韧

doi:10.19912/j.0254-0096.tynxb.2021-0343

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

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

作者信息 +

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

Yu Yongdi¹, Chen Liu^1,2, Zheng Zhehui¹, Dai Ren¹

Author information +

文章历史 +

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。

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.

导出引用

于永迪, 陈榴, 郑哲辉, 戴韧. NACA0018翼型锯齿格尼襟翼尾迹特征的Liutex分析[J]. 太阳能学报. 2022, 43(10): 210-217 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0343

Yu Yongdi, Chen Liu, Zheng Zhehui, Dai Ren. EFFECT OF SERRATED GURNEY FLAP ON NACA0018 AIRFOIL WAKE WITH LIUTEX IDENTIFICATION METHOD[J]. Acta Energiae Solaris Sinica. 2022, 43(10): 210-217 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0343

中图分类号： TK89

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