Time resolved PIV and flow visualization of 3D sheet cavitation
Time resolved PIV and flow visualization of 3D sheet cavitation
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DOI：
10.1007/s0034s-005-0082-9
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发表时间：
2006-04-01
影响因子：
2.4
通讯作者：
Wieneke, B
中科院分区：
文献类型：
--
作者：
Foeth, EJ;van Doorne, CWH;Wieneke, B
时间分辨粒子图像测速技术（Time - resolved PIV）被用于研究水翼上充分发展的片状空化，该水翼的展向攻角是变化的。此水翼被设计成具有一种与螺旋桨空化密切相关的三维空化模式，研究其作为振动、噪声和侵蚀产生的不利影响。对于粒子图像测速测量，荧光示踪粒子与光学滤波器结合使用，以消除空化对激光片光的反射。开发了一种自适应掩模来找到汽相和液相之间的界面。发现空化腔界面处的速度非常接近一个简单流线模型所预测的速度。为了对整体流动动力学进行可视化，激光束被扩展并用于照亮整个水翼和空化结构。时间分辨记录揭示了附着空化腔的生长和云雾脱落。我们的研究证明了在充分发展的片状空化周围进行精确粒子图像测速测量的可行性。所呈现的结果将进一步作为对这种复杂流动的数值模拟进行验证的基准。
Time-resolved PIV was applied to study fully developed sheet cavitation on a hydrofoil with a spanwise varying angle of attack. The hydrofoil was designed to have a three-dimensional cavitation pattern closely related to propeller cavitation, studied for its adverse effects as vibration, noise, and erosion production. For the PIV measurements, fluorescent tracer particles were applied in combination with an optical filter, in order to remove the reflections of the laser lightsheet by the cavitation. An adaptive mask was developed to find the interface between the vapor and liquid phase. The velocity at the interface of the cavity was found to be very close to the velocity predicted by a simple streamline model. For a visualization of the global flow dynamics, the laser beam was expanded and used to illuminate the entire hydrofoil and cavitation structure. The time-resolved recordings reveal the growth of the attached cavity and the cloud shedding. Our investigation proves the viability of accurate PIV measurements around developed sheet cavitation. The presented results will further be made available as a benchmark for the validation of numerical simulations of this complicated flow.