Generating controllable velocity fluctuations using twin oscillating hydrofoils: experimental validation

Generating controllable velocity fluctuations using twin oscillating hydrofoils: experimental validation
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使用双振荡水翼产生可控速度波动:实验验证

DOI:
10.1017/jfm.2014.257
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发表时间:
2014
影响因子:
3.7
通讯作者:
Harding S
Harding S
中科院分区:
工程技术2区
文献类型:
--
作者:
Harding S

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用两个俯仰翼产生可控二维速度脉动的方法在以前的一篇论文中已从理论上推导出来。本工作描述了该方法的实验实施。实验在再循环水通道中进行,该通道经过优化,可在来流中提供低湍流强度。使用声学多普勒测速仪(ADV)测量速度。翼片的俯仰运动使用闭环控制系统进行位置控制。研究了两种速度波动模式。它们由正弦分量的组合组成。理论预测和实验测量进行了比较,在时域和频域。虽然观察到一些差异,协议一般是好的,因此验证了研究条件的理论方法。
A method for generating controllable two-dimensional velocity fluctuations using two pitching foils was derived theoretically in a previous companion paper. The present work describes the experimental implementation of the method. The experiments are carried out in a re-circulating water channel optimised to provide low turbulence intensity in the incoming flow. Velocities are measured using an acoustic Doppler velocimeter (ADV). The pitching motions of the foils are position-controlled using a closed-loop control system. Two velocity fluctuation patterns are investigated. They consist of a combination of sinusoidal components. Theoretical predictions and experimental measurements are compared in the time and frequency domain. Although some discrepancies are observed, the agreement is generally good and therefore validates the theoretical method for the conditions investigated.
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