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首页> 外文期刊>Journal of the American Helicopter Society >An Exploration of Radial Flow on a Rotating Blade in Retreating Blade Stall
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An Exploration of Radial Flow on a Rotating Blade in Retreating Blade Stall

机译：后退失速时旋转叶片径向流的探讨。

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摘要

The nature of radial flow during retreating blade stall on a two-bladed teetering rotor with cyclic pitch variation is investigated using laser sheet visualization and particle image velocimetry in a low-speed wind tunnel. The velocity field above the retreating blade at 270° azimuth shows the expected development of a radially directed jet layer close to the blade surface in the otherwise separated flow region. This jet is observed to break up into discrete structures, limiting the spanwise growth of the radial velocity in the jet layer. The discrete structures are shown to derive their vorticity from the "radial jet" layer near the surface, rather than from the freestream at the edge of the separated region. The separation line determined using velocity data shows the expected spanwise variation. The results of this study are also correlated in a limited range of extrapolation to the phenomena encountered on a full-scale horizontal axis wind turbine in yaw.
机译：利用低速风洞中的激光薄片可视化和粒子图像测速技术，研究了具有周期性螺距变化的两叶片跷跷板转子在叶片失速时的径向流动特性。后退叶片上方270°方位角上的速度场表明，在原本分开的流动区域中，靠近叶片表面的径向射流层的预期发展。观察到该射流分解成离散的结构，从而限制了射流层中径向速度的跨度增长。离散结构显示为从表面附近的“径向射流”层获得涡旋，而不是从分离区域边缘的自由流获得涡旋。使用速度数据确定的分离线显示了预期的翼展方向变化。这项研究的结果在有限的外推范围内也与在偏航条件下的全尺寸水平轴风力涡轮机上遇到的现象相关。

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  • 来源
    《Journal of the American Helicopter Society》 |2013年第2期|022005.1-022005.10|共10页
  • 作者

    Vrishank Raghav; Narayanan Komerath;

  • 作者单位

    Daniel Guggenheim School of Aerospace Engineering Georgia Institute of Technology, Atlanta, GA;

    Daniel Guggenheim School of Aerospace Engineering Georgia Institute of Technology, Atlanta, GA;

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  • 正文语种 eng
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