作者：任常在, 代元军, 李保华, 徐立军

作者单位：新疆工程学院电力工程系, 新疆 乌鲁木齐 830091

关键词：风力机;V型叶尖结构;流场;声场;涡量

摘要：

基于计算流体力学方法，利用FW-H声学计算方程分析不同V型叶尖结构对风力机近尾迹流场和声场造成的影响，分析额定尖速比下不同V型叶尖结构风力机流场、涡量场分布情况及叶尖区域内声压值的变化规律。结果表明：合理改变叶尖结构能够有效改善风力机叶轮叶尖速度分布情况，进而改变叶轮叶尖处涡量场的大小；V型叶尖结构风力机叶尖处产生的涡量小于未改型叶尖型风力机；V型叶尖结构风轮旋转基频所对应的旋转噪声总声压级低于未改型叶尖型风力机4~6 dB，降幅在4.72%~6.39%；V型叶尖的高度是影响风轮旋转噪声和叶尖涡噪声降低的主要因素。

Simulation study on V-type tip structure's impact on near-wake flow field and sound field of wind turbine

REN Changzai, DAI Yuanjun, LI Baohua, XU Lijun

Department of Electric Power Engineering, Xinjiang Institute of Engineering, Urumqi 830091, China

Abstract: In this paper, based on the computational fluid dynamics method and the FW-H equation, the impact of different V-type tip structures on the near-wake flow field and sound field of wind turbine was analyzed and under the rated tip-speed ratio, the flow field and vorticity field distribution and the sound pressure variation in the tip area were analyzed on different V-type tip structures of wind turbine. The results show that changing tip structure reasonably can improve the tip-speed distribution on impeller of wind turbine effectively and hence change the size of vorticity field at tip of the impeller. The vorticity at the tip of the V-type tip structure wind turbine is less than that of unmodified tip type structure wind turbine. The total sound pressure level of rotating noise of V-type tip structure wind turbine at rotating base frequency is 4-6 dB lower than that of unmodified tip type structure wind turbine, with a decline of 4.72%-6.39%. The height of the V-shaped tip is the main factor affecting rotor rotating noise and tip vortex noise reduction.

Keywords: wind turbine;V-type tip structure;flow field;sound field;vorticity

2017, 43(7): 128-133  收稿日期: 2016-10-18;收到修改稿日期: 2016-12-03

基金项目: 新疆维吾尔族自治区自然科学基金项目（2015211A012）

作者简介: 任常在(1989-),男,辽宁朝阳市人,讲师,硕士,主要从事新能源应用技术方面的研究工作。

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