Effects of airfoil concave change on rotating noise of wind turbine
L Wenchun1,2， WANG Jianwen1,3,4， DUAN Yafan1， MA Jianlong1,3,4，MENGKE Qilao1,3,4， CHEN Jingxia2
1.School of Energy and Power Engineering， Inner Mongolia University of Technology， Hohhot 010051， China；
2.Research Center of Technology and Vocational Education， Inner Mongolia Technical College of Mechanics and Electrics， Hohhot 010070， China；
3.Engineering Research Center of Renewable Energy at Universities of Inner Mongolia Autonomous Region， Hohhot 010051， China；
4.Key Laboratory of Wind Energy and Solar Energy Technology， Ministry of Education， Hohhot 010051， China
Abstract：For a distributed small wind turbine blade, in order to explore effects of airfoil concave change on rotating noise of wind turbine, a 60-channel acoustic array system was used to collect rotating noise of concave variable blade and original blade wind wheels, and through exploring effects of airfoil concave change on dynamic response of wind wheel structure, the reason of wind wheel’s rotating noise reduction caused by airfoil concave change was analyzed. Results showed that airfoil concave change can effectively improve natural frequency and damping ratio of blade, enhance blade stiffness, effectively reduce blade’s expansion and contraction action on the surrounding fluid, and thus reduce rotating noise of wind turbine; the sensitivity of airfoil concave change to the influence of different frequency-doubling harmonic sound pressure levels of rotating noise is different, the sensitivity increases with increase in frequency-doubling times; the related study results provide new idea and solution scheme for reducing rotating noise of wind turbine.
吕文春1,2，汪建文1,3,4，段亚范1，马剑龙1,3,4，孟克其劳1,3,4，陈金霞2. 翼型凹变对风轮旋转噪声影响特性分析[J]. 振动与冲击, 2021, 40(1): 45-51.
L Wenchun1,2， WANG Jianwen1,3,4， DUAN Yafan1， MA Jianlong1,3,4，. Effects of airfoil concave change on rotating noise of wind turbine. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(1): 45-51.
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