摘要
风力机气动性能受静态失速与动态失速影响很大,对风力机翼型的失速问题研究具有重要意义。本文通过计算流体力学方法得到的风力机翼型在固定大攻角工况,以及大攻角震荡工况下的非定常流场,来研究翼型静态失速与动态失速。采用本征正交分解方法(POD),对非定常流场降阶,得到流场的POD模态以及对应的系数。POD模态结果表明在静态失速下,主要非定常流动结构是尾迹区域交替脱落的涡结构;在动态失速下,除了尾迹区域,前缘和整个吸力面都存在流动分离结构。
The aerodynamic performance of wind turbines is greatly affected by phenomenon of the stall and dynamic stall.Therefore,it is essential to study the stall problem of wind turbine airfoil.In this paper,the unsteady flow around both a static wind turbine airfoil and an oscillating airfoil under a big angle of attack is obtained by the method of the computational fluid dynamics to investigate the stall and the dynamic stall.The dominant modes and corresponding coefficients are extracted by the method of POD.The results show that the main unsteady characteristics of the static stall are the period shear vortices in the wake.For the dynamic stall,shear vortices generate from all the suction side not only the wake and leading edge.
作者
孙翀
石磊
沈昕
竺晓程
杜朝辉
SUN Chong;SHI Lei;SHEN Xin;ZHU Xiao-Cheng;DU Zhao-Hui(School of Mechanical Engineering,Shanghai Jino Tong University,Shanghai 20024,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2021年第4期894-904,共11页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.11872249)。
