受自然界鸟类在应对阵风或着陆时翅膀上表面（吸力面）羽毛轻微抬起现象启发，以NACA0018翼型为基础，在其吸力面加装类似鸟类羽毛的弹片，通过数值模拟方法研究流动分离状态下弹片对翼型气动性能及气动噪声的影响。结果表明：翼型在流动分离状态下，依据原始翼型边界层分离特点给出特定抬起角度的弹片，能有效抑制流动分离区前移，减小流动分离，较之原始翼型其升力系数上升、阻力系数下降；流动分离区与翼型尾缘处声压级有所减小，周向总声压级呈偶极子分布且整体有所降低。

Inspired by the fact that birds’ feathers on the wings (suction surface) are slightly lifted in response to gusts or landings,and based on the NACA0018 airfoil,an elastic flap resembling bird feathers is added to the suction surface,which can have certain effects on aerodynamic performance,and the aerodynamic noise of airfoil is studied in the flow separation state by the method of numerical simulation.The results show that: the airfoil in the flow separation state,according to the original airfoil boundary layer separation characteristics,yields a specific lifting angle of the elastic flap,which can effectively resist the flow separation zone moving forward and reduce the flow separation,leading to an increase in lift coefficient and an decrease of resistance coefficient in contrast to the original airfoil. Meanwhile,the sound pressure level of the flow separation zone and the airfoil trailing edge is reduced,and the circumferential total sound pressure level is dipole distribution and also reduced overall.

TK83

国家自然科学基金(51976131，51676131)；国家自然基金国际(地区)合作与交流项目(51811530315)；上海市“科技创新行动计划”地方院校能力建设项目(19060502200)