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首页> 外文期刊>Ocean Engineering >Analysis of wake behind a rotating propeller using PIV technique in a cavitation tunnel
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Analysis of wake behind a rotating propeller using PIV technique in a cavitation tunnel

机译：利用PIV技术分析空化隧道中旋转螺旋桨后的尾流

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A two-frame particle image velocimetry (PIV) technique is used to investigate the wake characteristics behind a marine propeller with 4 blades at high Reynolds number. For each of 9 different blade phases from 0° to 80°, 150 instantaneous velocity fields are measured. They are ensemble averaged to study the spatial evolution of the propeller wake in the region ranging from the trailing edge to one propeller diameter (D) downstream location. The phase-averaged mean velocity shows that the trailing vorticity is related to radial velocity jump, and the viscous wake is affected by boundary layers developed on the blade surfaces and centrifugal force. Both Galilean decomposition method and vortex identification method using swirling strength calculation are very useful for the study of vortex behaviors in the propeller wake region. The slipstream contraction occurs in the near-wake region up to about X/D = 0.53 downstream. Thereafter, unstable oscillation occurs because of the reduction of interaction between the tip vortex and the wake sheet behind the maximum contraction point.
机译：两帧粒子图像测速（PIV）技术用于研究高雷诺数下具有4个叶片的船用螺旋桨后的尾流特性。对于从0°到80°的9个不同叶片相位中的每个相位，都测量了150个瞬时速度场。对它们进行整体平均，以研究螺旋桨尾流在从后缘到一个螺旋桨直径（D）下游位置范围内的空间演变。相平均速度表明，尾涡与径向速度跳跃有关，粘性尾流受叶片表面边界层和离心力的影响。伽利略分解法和利用旋流强度计算得出的涡旋识别方法都对研究螺旋桨尾流区域的涡旋行为非常有用。滑流收缩发生在近尾流区，直到下游大约X / D = 0.53。此后，由于减小了在最大收缩点之后的尖端涡旋和尾流板之间的相互作用，因此发生了不稳定的振荡。

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