Numerical study on noise reduction of wind turbine blade vortex generator
Numerical study on noise reduction of wind turbine blade vortex generator
复制标题
风电叶片涡流发生器降噪数值研究
DOI：
10.1088/1755-1315/358/2/022026
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Zou Pingguo
中科院分区：
文献类型：
--
作者：
Li Gang;Zhang Zhengtao;Zou Pingguo
目前，风力发电应用广泛，特别是在居民区附近，叶片噪声已成为影响机组安装和运行的重要因素。涡流发生器是近年来风力涡轮机叶片制造商采用的一项新技术。目前国内对安装涡流发生器后叶片气动噪声变化的研究还很少。为了研究涡流发生器对气动噪声的影响，采用数值计算方法对叶片安装涡流发生器前后的流场进行了模拟。对可视化结果进行输出和比较，并对涡量、压力等参数进行分析。其次，基于流场的详细参数，采用FW-H方程计算声源传播，得到了加涡发生器前后叶片的声压级谱。研究表明，涡发生器附近及下游区域涡量增大，促进了上层流体与边界层流体之间的质量和能量交换，从而延缓了边界层分离，使尾涡减弱。气动噪声为低频噪声，加装涡流发生器可显著降低叶片气动噪声。
At present, wind power is widely used, especially in near-residential areas, and blade noise has become an important factor affecting the installation and operation of the unit. Vortex Generator is a new technology that has been used by wind turbine blade manufacturers in recent years. At present, there are few studies on the changes of blade aerodynamic noise after the installation of vortex generators in China. In order to study the influence of vortex generators on aerodynamic noise, the flow field is simulated by numerical calculation method before and after the blade is installed with vortex generators. The visualization results are output and compared, and the parameters such as vorticity and pressure are analyzed. Secondly, based on the detailed parameters of the flow field, FW-H equation is used to calculate the sound source propagation, and the sound pressure level spectrum of the blade before and after the vortex generators added is obtained. The research shows that the vorticity increases in the vicinity of vortex generators and the downstream region, which promotes the mass and energy exchange between the upper fluid and fluid in the boundary layer, so the boundary layer separation is delayed, and the wake vortex subsides. The aerodynamic noise is low frequency noise, and the addition of vortex generators can significantly reduce the aerodynamic noise of the blade.