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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Three-dimensional flow visualization and vorticity dynamics in revolving wings
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Three-dimensional flow visualization and vorticity dynamics in revolving wings

机译：旋转机翼中的三维流动可视化和涡旋动力学

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摘要

We investigated the three-dimensional vorticity dynamics of the flows generated by revolving wings using a volumetric 3-component velocimetry system. The threedimensional velocity and vorticity fields were represented with respect to the base axes of rotating Cartesian reference frames, and the second invariant of the velocity gradient was evaluated and used as a criterion to identify two core vortex structures. The first structure was a composite of leading, trailing, and tip-edge vortices attached to the wing edges, whereas the second structure was a strong tip vortex tilted from leading-edge vortices and shed into the wake together with the vorticity generated at the tip edge. Using the fundamental vorticity equation, we evaluated the convection, stretching, and tilting of vorticity in the rotating wing frame to understand the generation and evolution of vorticity. Based on these data, we propose that the vorticity generated at the leading edge is carried away by strong tangential flow into the wake and travels downwards with the induced downwash. The convection by spanwise flow is comparatively negligible. The three-dimensional flow in the wake also exhibits considerable vortex tilting and stretching. Together these data underscore the complex and interconnected vortical structures and dynamics generated by revolving wings.
机译：我们使用体积三分量测速系统研究了旋翼产生的气流的三维涡旋动力学。相对于旋转的笛卡尔参考系的基轴表示三维速度场和涡度场，并评估了速度梯度的第二不变性，并将其用作识别两个核心涡旋结构的标准。第一种结构是附着在机翼边缘的前，后和尖端涡旋的合成，而第二结构是从尖端涡旋倾斜并掉入尾流的强涡旋，以及在尖端产生的涡旋边缘。使用基本涡度方程，我们评估了旋翼框架中涡度的对流，拉伸和倾斜，以了解涡度的产生和演化。基于这些数据，我们建议在前缘产生的涡流被强切向流进入尾流而带走，并随着诱导的向下冲洗而向下传播。翼展方向的对流相对可以忽略不计。尾流中的三维流动还表现出相当大的涡旋倾斜和拉伸。这些数据共同强调了旋转机翼产生的复杂而相互联系的涡旋结构和动力学。

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