An experimental study on flow separation control of hydrofoils with leading-edge tubercles at low Reynolds number
An experimental study on flow separation control of hydrofoils with leading-edge tubercles at low Reynolds number
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DOI：
10.1016/j.oceaneng.2015.08.004
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发表时间：
2015-11
影响因子：
5
通讯作者：
Zhaoyu Wei;T. New;Y. Cui
中科院分区：
文献类型：
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作者：
Zhaoyu Wei;T. New;Y. Cui
在雷诺数Re =1.4×104的水洞中对带前缘结节的翼型水动力特性进行了实验研究。粒子图像测速测量和粒子条纹可视化显示，结节改善流动分离行为。特别是，具有较大波幅和较小波长的水翼在流动分离控制方面往往表现得更好。横流测量表明，流向反向旋转涡对产生的结节和减轻流动分离。分析证实，由于相对于边界层厚度的高度相当，结节起着涡流发生器的作用。涡对弯曲并与相邻流相互作用，导致流分离行为偶尔不稳定，从而导致可变的流分离区域尺寸。这表明，可能必须采取措施，以确保反向旋转涡对的稳定性，以实现更持久和可预测的改善。
Hydrodynamic characteristics of hydrofoils with leading-edge tubercles were experimentally investigated in a water tunnel at a Reynolds number ofRe=1.4×104. Particle image velocimetry measurements and particle-streak visualizations reveal that the tubercles improve flow separation behaviour. In particular, hydrofoils with larger wave amplitudes and smaller wavelengths tend to perform significantly better in flow separation control. Cross-stream flow measurements indicate that streamwise counter-rotating vortex pairs are generated over the tubercles and mitigate flow separation. Analysis confirms that the tubercles function as vortex generators, due to their comparable heights relative to the boundary layer thickness. The vortex pairs meander and interact with adjacent flows, causing the flow separation behaviour to be occasionally unstable, thus leading to variable flow separation region sizes. This suggests that measures may have to be taken to ensure the stability of the counter-rotating vortex pairs for more persistent and predictable improvements.