锯齿尾缘DU91-W2-250风力机翼型气动及噪声特性分析  

RESEARCH ON AERODYNAMICS AND NOISE CHARACTERISTICS OF DU91-W2-250 AIRFOIL OF WIND BLADE WITH SERRATED TRAILING EDGE

作　　者：汪瑞欣 赵振宙[1] 王同光[2] 曾冠毓 许波峰[1] 郑源[1] Wang Ruixin;Zhao Zhenzhou;Wang Tongguang;Zeng Guanyu;Xu Bofeng;Zheng Yuan(College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China;Jiangsu Key Laboratory of Hi-Tech Research for Wind Turbine Design,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China)

机构地区：[1]河海大学能源与电气学院,南京211100 [2]南京航空航天大学江苏省风力机设计高技术研究重点实验室,南京210016

出　　处：《太阳能学报》2020年第12期221-228,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(11502070;51876054);国家重点基础研究发展(973)计划(2014CB046200)。

摘　　要：采用脱体涡模拟与声类比的方法,研究锯齿尾缘结构对风力机专用翼型DU91-W2-250气动噪声的影响规律;比较直尾缘二维叶片C100、齿高分别为2.5%、5.0%、7.5%和10.0%弦长的C97.5、C95.0、C92.5、C90.0锯齿尾缘结构二维叶片,在不同攻角下近场噪声分布、远场噪声分布、涡结构和升力系数的变化规律。研究结果表明:翼型噪声声压级呈偶极子形状分布;随着锯齿高度的增加,噪声分布总体呈先增加后减小的趋势,C92.5锯齿尾缘结构在各攻角下的降噪效果均表现较好,C90.0锯齿尾缘结构次之,C97.5尾缘结构最差。在近场半径r=0.45 m及远场半径R=1.5 m比较发现,远场声压级偶极子分布特性更加明显,总体声压级较近场降低了5~10 dB。以直尾缘叶片升力系数的模拟结果来验证模拟精度,模拟结果与试验值吻合良好,证明模拟结果可反映真实情况。The Detached Eddy Simulation(DES)method as well as the FW-H equation was employed to research the effect of the serrated trailing edge on aerodynamic noise characteristics of the dedicated airfoil of wind turbine blade,DU91-W2-250. Five two-dimensional blades with different trailing edges were in this paper,which are named as C100,C97.5,C95.0,C92.5,C90.0 individually,and their heights of serrated edges are 0%c,2.5%c,5.0%c,7.5%c and 10.0%c correspondingly,where c denotes chord length. The variation trends of Sound Pressure Level(SPL)in near field and far field,vortex structure and lift coefficient versus angle of attack were researched also. The results show that:the SPL distribution of the airfoil shows a dipole shape;as the height of the serrated airfoil is increasing,SPL increases firstly and then decreases. Among all the blades,the C92.5 has the best performance to reduce SPL at all angles of attack,while the C97.5 shows the worst performance. Between the far field of 1.5 m radius and the near field of 0.45 m radius,SPL distribution in the latter appears a more obvious dipole shape,and 5-10 d B lower than that of the former. The simulation results of blade with straight airfoil a in good agreement with the experimental results,which proves that all the results in this paper are able to reflect the real information.

关 键 词：风力机 DU91-W2-250 气动噪声 气动性能 锯齿尾缘 

分 类 号：TK81[动力工程及工程热物理—流体机械及工程]