摘要
针对某分布式小型风力机叶片,为了探究翼型凹变后对风轮旋转噪声的影响效果,利用60通道声阵列系统对凹变叶片和原叶片风轮进行旋转噪声采集,并通过探究翼型凹变对风轮结构动态响应的影响,解析了翼型凹变造成风轮旋转噪声降低的原因。结果表明,翼型凹变可以有效地提高叶片的固有频率和阻尼比,提升了叶片的刚度,有效地减弱了叶片对周围流体的涨缩作用,从而降低了风轮的旋转噪声;另外发现,翼型凹变对旋转噪声不同倍频谐波声压级影响的敏感性不同,即随着倍频次数的增加而逐渐增强。相关研究成果为降低风轮旋转噪声提供了新的思路及解决方案。
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.
作者
吕文春
汪建文
段亚范
马剑龙
孟克其劳
陈金霞
LU Wenchun;WANG Jianwen;DUAN Yafan;MA Jianlong;MENGKE Qilao;CHEN Jingxia(School of Energy and Power Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Research Center of Technology and Vocational Education,Inner Mongolia Technical College of Mechanics and Electrics,Hohhot 010070,China;Engineering Research Center of Renewable Energy at Universities of Inner Mongolia Autonomous Region,Hohhot 010051,China;Key Laboratory of Wind Energy and Solar Energy Technology,Ministry of Education,Hohhot 010051,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第1期45-51,85,共8页
Journal of Vibration and Shock
基金
国家自然科学基金(51766014,51966014)
内蒙古自然科学基金(2016ZD04,2019MS05021)
内蒙古自治区高等学校科学研究项目(NJZY19270)。
关键词
翼型凹变
刚度
旋转噪声
声压级
airfoil concave change
stiffness
rotating noise
sound pressure level
