仿鸮翼非光滑前缘对风力机叶片气动性能的影响

经过数百万年的进化,鸮形目鸟类在其飞行行为上显现出许多优异的特征。文章选取鸮翼的非光滑前缘作为仿生对象,设计出一种仿生风力机叶片,并分析非光滑前缘结构对风力机叶片气动性能的影响。采用S-A湍流模型,对低雷诺数下原型风力机叶片和仿生风力机叶片进行绕流流场模拟。模拟结果表明,在大攻角下,仿生风力机叶片的前缘凸起能够改变气流在叶片表面的流向分布,使气流在吸力面仍保持附着流动,进而减少叶片吸力面的失速区,有效延缓叶片失速现象的发生,从而使得仿生风力机叶片的失速角比原型风力机叶片的失速角推迟了10°左右,改善了风力机叶片的气动性能。

Effect imitation owl wing leading edge of the non-smooth aerodynamic performance of the wind turbine blade

After millions of years of evolution,owls show many excellent characteristics in their flight.In this paper,the non-smooth leading edge of owl wing is selected as the bionic object,and a bionic wind turbine blade is designed,and the influence of non smooth leading edge structure on the aerodynamic performance of wind turbine blade is analyzed.The S-A turbulence model is used to simulate the flow field around the prototype wind turbine blade and bionic wind turbine blade at low Reynolds number.The simulation results show that the leading edge bulge of the bionic wind turbine blade can change the flow direction distribution of the air flow on the blade surface,make the air flow still adhere to the suction surface,thus reducing the stall area of the suction surface of the blade,effectively delaying the occurrence of the stall phenomenon of the blade,so that the stall angle of the bionic wind turbine blade is delayed by about 10°compared with the prototype wind turbine blade.The aerodynamic performance of wind turbine blade is improved.