叶片尾缘凹痕对风力机声压特性影响研究  

Influence of Blade Trailing Edge Indentation on Acoustic Pressure Characteristics ofWind Turbines

作　　者：霍忠堂 高建松 张丁丁 HUO Zhongtang;GAO Jiansong;ZHANG Dingding(College of Mechanical and Electrical Engineering,Handan University,Handan 056000,Hebei,China;Key Laboratory of Intelligent Awareness and Application,Handan University,Handan 056000,Hebei,China)

机构地区：[1]邯郸学院机电学院,河北邯郸056000 [2]邯郸学院智能感知与应用重点实验室,河北邯郸056005

出　　处：《噪声与振动控制》2024年第5期100-106,153,共8页Noise and Vibration Control

基　　金：教育部高等教育司资助项目(202101087061);河北省教育厅科学技术研究资助项目(QN2022185);邯郸市科学技术研究与发展计划资助项目(21422021165)。

摘　　要：兆瓦级风力机叶片产生的噪声对周围环境产生重要影响,叶片全速运行时尾缘极易产生脱落旋涡,脱落旋涡的运移规律对声压特性产生重要影响。为研究尾缘凹痕对叶片声压特性影响的机理,以NACA4415翼型为研究对象,采用k-εSST湍流模型,计算3种表面结构翼型全速运行下耦合区域的声压参数。结果表明:凹痕翼型较光源翼型可以大幅度削减尾缘较高频率脱落旋涡分布范围与概率;对翼型上端面进行凹痕化处理可以大幅度降低尾缘脱落旋涡的螺旋度与尾缘涡核的分布范围,同时能保证翼型气动特性曲线分布在光滑翼型90%的置信区间内;对翼型上端面进行凹痕处理所致最大声压下降率为1.46%,最大声功率下降率为31.50%,相关结论可为后续环境友好型叶片研究奠定理论基础。The noise generated by megawatt-level wind turbine blades has a significant impact on the surrounding envi-ronment.When the blades are operating at full speed,trailing edge separation vortices are easily formed,and the kinematic performances of these vortices have an important influence on the sound pressure characteristics.To study the impact mecha-nism of trailing edge indentations on the sound pressure characteristics of blades,the NACA4415 airfoil is chosen as the re-search object,and the k-εSST turbulence model is used to calculate the acoustic parameters in the coupled region of three different surface structures of airfoils at full operating speeds.The results show that the indented airfoil can significantly re-duce the distribution range and probability of high-frequency trailing edge separation vortices compared to the smooth air-foil.Indenting the upper surface of the airfoil can greatly reduce the helicity of the trailing edge separation vortices and the distribution range of the vortex core,meanwhile ensure that the aerodynamic characteristic curve of the airfoil is within the 90%confidence interval of the smooth airfoil.The maximum sound pressure reduction rate for the indented airfoil is 1.46%,and the maximum sound power reduction rate is 31.50%.This conclusion lays a theoretical foundation for future re-search on environmental friendly blade design.

关 键 词：声学 风力机叶片 脱落旋涡 k-εSST湍流模型 声压参数 气动特性 

分 类 号：TM315[电气工程—电机] TB525[理学—物理]