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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >PIV measurements of the asymmetric wake of a two dimensional heaving hydrofoil
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PIV measurements of the asymmetric wake of a two dimensional heaving hydrofoil

机译：二维升沉水翼的不对称尾迹的PIV测量

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摘要

Particle image velocimetry is used to examine the flow behind a two-dimensional heaving hydrofoil of NACA 0012 cross section, operating with heave amplitude to chord ratio of 0.215 at Strouhal numbers between 0.174 and 0.781 and a Reynolds number of 2,700. The measurements show that for Strouhal numbers larger than 0.434, the wake becomes deflected such that the average velocity profile is asymmetric about the mean heave position of the hydrofoil. The deflection angle of the wake, which is related to the average lift and drag on the hydrofoil, is found to lie between 13 and 18. An examination of the swirl strength of the vortices generated by the hydrofoil motion reveal that the strongest vortices, which are created at the higher Strouhal numbers, dissipate most rapidly.
机译：粒子图像测速仪用于检查NACA 0012横截面的二维升沉水翼后面的流动，在Strouhal数在0.174和0.781之间且雷诺数为2,700的情况下，升沉振幅与弦比为0.215。测量结果表明，对于大于0.434的Strouhal数，尾流会发生偏转，从而使平均速度曲线相对于水翼的平均升沉位置不对称。尾流的偏转角（与水翼上的平均升力和阻力有关）位于13至18之间。检查由水翼运动产生的旋涡的旋流强度可以发现，最强的旋涡以较高的Strouhal数创建，耗散最快。

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