相关研究表明多孔尾缘在降低翼型噪声的同时，对其气动性能也有一定影响，且穿孔几何尺寸和位置是影响尾缘翼型噪声与气动特性的重要参数。针对NACA65019翼型，在来流雷诺数Re=2×105条件下，采用计算流体力学方法研究具有不同穿孔孔径和位置的尾缘双穿孔翼型绕流特征和噪声特性，并通过部分实验验证模拟的可靠性。研究结果表明：尾缘双穿孔翼型在小攻角下，升阻比较原翼型有较明显的提升，当来流攻角大于12 °后，升阻比开始小于原翼型；在一定来流攻角范围内，尾缘双穿孔翼型可延迟吸力面分离，降低吸力面边界层厚度；边界层厚度的降幅与穿孔孔径、穿孔位置密切相关，最大可达28.8%。根据相关声学理论模型，分析了穿孔孔径及位置对尾缘双穿孔翼型噪声特性的影响，经数值研究表明：α=6°时，在100~7 kHz频率范围，不同的尾缘双穿孔翼型相较于原翼型噪声降低最高可达10.7 dB；d=1.0 mm和Xc/c=0.82翼型效果最佳。

The related research shows that the porous trailing edge has some influence on the aerodynamic performance of the airfoil while reducing the airfoil noise.The geometric parameters of perforation are important parameters that affect the noise and aerodynamic characteristics of the porous trailing airfoil.Under the condition of the Reynolds number of 2×105,the flow characteristics of the airfoil with different perforation size and perforation positions are studied by using Computational Fluid Dynamics for the NACA65019 airfoil and the reliability of simulation is verified with some experiments.The results of the study show that the doublepunched trailing edge of airfoil has a better lift resistance compared with the prototype under the small attack angle.While the angle of attack is greater than 12 degrees,the liftdrag ratio becomes less than the prototype airfoil.In a certain range of attack angle,the doublepunched trailing edge of airfoil can delay the separation of the suction surface and reduce the boundary layer thickness of suction surface.The decrease of boundary layer thickness is closely related to perforation size and perforation location,up to 28.8%.Based on the related acoustic theory model,this paper analyzes the influence of perforation size and location for noise characteristics.Numerical results show that in the frequency range from 100 Hz to 7 kHz,the noise reduction of different doublepunched trailing edge airfoils is up to 10.7 dB compared with the original airfoils at α=6°.The d=1.0 mm and Xc/c=0.82 airfoils are the best.

V231

国家自然科学基金（51106099,11502146）； 上海市科委基地建设项目（13DZ2260900）