摘要
提出一种在叶片尾缘布置分形孔的分形尾板叶片,以提高气动性能和改善流场流态。分别对原始叶片、无孔尾板叶片及分形尾板叶片进行三维流场数值计算,研究无孔尾板及分形尾板对叶片流场和气动特性的影响及流动机理。结果表明:分形尾板有助于改善叶片周围流场结构,降低了叶片吸力面上及周围的湍流强度,有效地延迟了流动分离;分形尾板叶片在提高最大升力系数的同时,延迟了失速的发生,且阻力系数较无孔尾板叶片小;在临近失速攻角时,分形尾板叶片阻力系数比无孔尾板叶片表现出较好的气动性能。
To improve the aerodynamic performance and flow pattern of a wind turbine,a fractal trailing-plate blade with fractal grids on the trailing edge was proposed.Three-dimensional flow field calculations were performed on the original blade,non-grid trailing-plate blade and fractal trailing-plate blade to study the influence mechanism of the non-grid trailing-plate and fractal trailing-plate on the flow field and aerodynamic characteristics of the blade.Results show that the fractal trailing-plate helps to improve the flow field structure around the blade,reduce the turbulence intensity on and around the suction surface,and effectively delay the flow separation.Besides,the fractal trailing-plate blade delays the stall while increasing the maximum lift coefficient,when the drag coefficient is smaller than that of the non-grid trailing-plate blade.In the vicinity of the stall angle of attack,the coefficient of resistance of the fractal trailing-plate blade exhibits better aerodynamic performance than that of the non-gird trailing-plate blade.
作者
张立
刘宇航
李春
邓允河
罗红
ZHANG Li;LIU Yuhang;LI Chun;DENG Yunhe;LUO Hong(Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Yatu New Energy Technology Co.,Ltd.,Shenzhen 518000,Guangdong Province,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2020年第2期152-160,共9页
Journal of Chinese Society of Power Engineering
基金
国家自然科学基金资助项目(51676131)
国家自然基金国际(地区)合作与交流资助项目(51811530315)
上海市"科技创新行动计划"地方院校能力建设资助项目(19060502200)。
关键词
分形学
分形尾板
气动性能
失速
计算流体力学
fractal theory
fractal trailing-plate
aerodynamic performance
stall
computational fluid dynamics(CFD)
