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首页> 外文期刊>Transactions of the Japan society for aeronautical and space sciences >Visualization of Vortex-Fin Interaction: Quantitative Interpretation of Flow Structure
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Visualization of Vortex-Fin Interaction: Quantitative Interpretation of Flow Structure

机译：涡-翅相互作用的可视化：流动结构的定量解释

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摘要

The interaction of a streamwise vortex with a fin is investigated experimentally using high-image-density particle image velocimetry, which allows determination of the instantaneous distributions of vorticity over entire planes of the flow. The vortex distortion past the fin is described in terms of averaged patterns of velocity field and instantaneous vorticity contours at two different locations of the fin. The instantaneous structure of the broken-down vortex upstream of the leading-edge of the fin exhibits the classical staggered pattern of alternating positive and negative concentrations of vorticity. Along the leading-edge of the fin, however, including the edge of the tip, positive concentrations of vorticity dominate. Averaging of these instantaneous vorticity concentrations shows that a time-averaged, positive vorticity layer exists along the leading-edge and tip of the fin. Over the surface of the fin, the averaged levels of vorticity are significantly lower than those on the edge.
机译：使用高图像密度粒子图像测速仪对流向涡旋与鳍片的相互作用进行了实验研究，这可以确定整个流动平面上涡旋的瞬时分布。根据速度场的平均模式和在鳍的两个不同位置处的瞬时涡度轮廓来描述经过鳍的涡流畸变。鳍片前缘上游的分解涡流的瞬时结构表现出交替的正负涡旋浓度的经典交错模式。然而，沿着鳍的前缘，包括尖端的边缘，涡度的正浓度占主导。这些瞬时涡度浓度的平均值表明，沿着鳍的前缘和尖端存在时间平均的正涡度层。在鳍片的表面上，平均涡度明显低于边缘。

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