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Separation control using quasi-radial wall jets

机译:使用准放射状壁射流的分离控制

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摘要

In this paper, flow separation control over a NACA 4415 wing section using arrays of discrete quasi-radial wall jets is numerically investigated. This novel flow control method is studied under conditions which the wing section angle of attack is alpha =18 degrees and Reynolds number based on chord length is Re-c = 550000. Contours of mean streamwise velocity indicated that quasi-radial wall jets cover wing surface rapidly. Therefore, arranging them in a spanwise row can be an effective way in adding momentum to the near wall fluid particles. According to the results, if blowing parameters of the jets be chosen correctly, arrays of quasi-radial wall jets would lead to considerable decrease in wake region extent and would bring enhancement of wing aerodynamic performance (up to 46% increment of lift coefficient). Moreover, investigation of streamlines and velocity vectors reveals the presence of two helical vortices on both edges of quasi-radial wall jets. These vortices, which form due to interactions between external stream and spanwise velocity component of jets, generate mixing in the surrounding fluid. It could be said that besides momentum addition, quasi-radial wall jets in an external stream act like vortex generators. (C) 2017 Elsevier Masson SAS. All rights reserved.
机译:在本文中,数值研究了使用离散准径向壁面射流阵列对NACA 4415机翼部分进行的流分离控制。在机翼截面迎角为α= 18度,基于弦长的雷诺数为Re-c = 550000的条件下,研究了这种新颖的流量控制方法。等速流的等高线表明准径向壁面射流覆盖机翼表面迅速。因此,将它们按展向排列是增加动量到近壁流体颗粒的有效方法。根据结果​​,如果正确选择射流的吹气参数,则准径向壁射流的阵列将导致尾流区域范围的显着减小,并将增强机翼的空气动力性能(升力系数最多增加46%)。此外,对流线和速度矢量的研究揭示了在准放射状壁射流的两个边缘上都存在两个螺旋涡旋。这些涡流是由于外部流和射流的展向速度分量之间的相互作用而形成的,它们在周围的流体中产生混合。可以说,除了增加动量之外,外部流中的准径向壁面射流还像涡流发生器一样起作用。 (C)2017 Elsevier Masson SAS。版权所有。

著录项

  • 来源
    《Aerospace science and technology》 |2017年第9期|240-251|共12页
  • 作者单位

    Sharif Univ Technol, Dept Aerosp Engn, Tehran, Iran;

    Sharif Univ Technol, Dept Aerosp Engn, Tehran, Iran;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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