摘要
保证额定来流风速i0m／s不变，在不同尖速比条件下，利用声阵列法对s系列翼型风力机的叶尖区域噪声进行了测试。结果表明：风轮在旋转过程中，风力机叶尖辐射噪声频谱在200Hz以下主要是由叶片旋转基频及其谐波构成的离散噪声叠加在宽频噪声上而组成的，而在200Hz左右至600Hz则是由叶片旋转产生的叶尖涡脱落频率以及风洞动力风扇的二次谐波构成的。随着尖速比的增加叶尖涡的脱落频率在增大，旋转基频声压级在叶片相对半径为0．57处的辐射噪声最大，且随着向叶尖移动，噪声逐渐减小。距离风轮旋转平面的轴向方向x=10—60cm之间辐射噪声衰减较快，在x=60—100cm之间衰减较慢。发现了叶尖涡的运动轨迹，叶尖涡是逐渐的向外迁移。
The blade tip downstream noise of the S-Series airfoil horizontal axis wind turbine were tested through acoustic array, ensuring rated wind speed 10 m/s and different tip speed ratios. The results showed that the wind turbine tip radiated noise spectrum is mainly composed of the blade rotation frequency and its harmonics constitute a discrete noise superimposed on the broadband noise below 200 Hz during wind wheel rotation. From 200 to 600 Hz, the noise spectrum is consisting of the tip vortex shedding frequency by the rotating blades generated and the second harmonic of the wind tunnel dynamic fan. The tip vortex shedding frequency increases with the increase in the tip speed ratio, is the maximum point of the rotating base frequency sound pressure level appears on 0.57 of the blade relative radius. With the movement towards the tip, noise gradually decreases. In the axial direction of the wind turbine rotation plane, the radiated noise decreases rapidly between x = 10 - 60 cm and the radiated noise attenuate rather slowly between x = 60 - 100 cm. The trajectory of the tip vortex, which is gradually migrated outward, was found.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2014年第1期70-73,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.50976047)
教育都博士学科点专项科研基金(No.20091514110001)
关键词
风力机
叶尖区域
声阵列
声压级
叶尖涡
wind turbine
blade tip downstream
acoustic array
sound pressure level
tip vortex
