| 旋翼悬停状态桨尖涡测量方法研究 |
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| 引用本文： | 刘平安,林永峰,陈垚峰,袁明川.旋翼悬停状态桨尖涡测量方法研究[J].实验流体力学,2017,31(4):39-44. |
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| 作者姓名： | 刘平安 林永峰 陈垚峰 袁明川 |
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| 作者单位： | 中国直升机设计研究所, 江西 景德镇 333000 |
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| 摘 要： | 为了研究旋翼桨尖涡涡核结构，采用粒子图像测速（PIV）技术对4m直径桨尖开孔旋翼在悬停状态的桨尖涡流场进行了详细测量，获得了旋翼145°方位角处桨尖涡附近流场的速度分布，以及桨尖涡的涡核半径、旋转速度和涡量分布等试验数据，并研究了PIV分析中选取不同审查窗尺寸对桨尖涡结构测量结果的影响。为了避免桨尖涡位置不稳定的影响，提出了基于桨尖涡流场速度特征的条件平均法，并与简单平均法和基于涡量峰值的条件平均法进行了对比，验证了对桨尖涡流场进行条件平均的必要性，以及所提出的条件平均法的有效性。
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| 关 键 词： | 旋翼 悬停 桨尖涡 流场 PIV |
| 收稿时间： | 2016-12-03 |
Blade tip vortex measurements of a hovering rotor |
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| Affiliation: | China Helicopter Research and Development Institute, Jingdezhen Jiangxi 333000, China |
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| Abstract: | In order to investigate the structure of blade tip vortices, Panicle Image Velocimetry (PIV) measurements were conducted on tip vortices trailing from the rotor with slotted blade to quantify the swirl velocity, core radius and vorticity profile at a fixed wake angle of 145 degree. The influence of the PIV image analysis parameters, e.g. sampling window size, on the vortex structure parameters has been investigated. To mitigate the effects of vortex wander, a scheme to align the velocity fields based on the locations where the velocity minimum appears prior to averaging was developed. Compared to simple average, the conditional average method obtains more accurate parameters of the vortex. |
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