Blade tip vortex measurements of a hovering rotor

Liu Ping'an; Lin Yongfeng; Chen Yaofeng; Yuan Mingchuan

doi:10.11729/syltlx20160186

Volume 31 Issue 4

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Journal of Experiments in Fluid Mechanics > 2017 > 31(4): 39-44. > DOI: 10.11729/syltlx20160186

Liu Ping'an, Lin Yongfeng, Chen Yaofeng, Yuan Mingchuan. Blade tip vortex measurements of a hovering rotor[J]. Journal of Experiments in Fluid Mechanics, 2017, 31(4): 39-44. DOI: 10.11729/syltlx20160186

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Blade tip vortex measurements of a hovering rotor

China Helicopter Research and Development Institute, Jingdezhen Jiangxi 333000, China

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Received Date: December 02, 2016
Revised Date: February 12, 2017

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Abstract

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.
- rotor,
- hovering,
- tip vortex,
- flow field,
- PIV

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