摘要
翼型是机翼以及风力机叶片等叶轮机械设计的基本元素,为有效抑制翼型表面流动分离以提高风力机气动性能,可在其吸力面加装类似鸟类羽毛的仿生翅片。通过数值模拟研究翼型周围流场结构,提出角度系数法,用于确定仿生翅片的安装角度,并进一步分析翼型噪声特性。结果表明:在流动分离状态下,位于最佳抬起角度的仿生翅片可有效阻止分离前移,延缓失速攻角,缩小尾缘脱落涡尺度,最大升力系数提高21%左右;同时,翅片翼型主频声压级减小约23.5dB,周向总声压级呈偶极子分布且明显降低。所得结果可为角度系数法的工程应用提供一定参考。
Airfoil is the basic element of the airplane wings and turbomachinery design such as wind turbine blades. In order to effectively suppress the flow separation of airfoil surface and improve the aerodynamic performance of wind turbines, bionic fin similar to bird feathers were installed on the suction surface. The flow field structure around the airfoil was studied by numerical simulation. Meanwhile the angle coefficient method was proposed to determine the installation angle of the bionic fin and the noise characteristics of the airfoil were further analyzed. The results show that in the state of the flow separation, the bionic fin at the optimal lift angle effectively prevent the separation from moving forward, delay the stall angle of attack, reduce the size of the trailing edge shedding vortex, and increase the maximum lift coefficient by 21%;At the same time, the main frequency sound pressure level of the fin airfoil is reduced by 23.5 dB, and the total sound pressure level in the circumferential direction shows a dipole distribution and is significantly reduced. The numerical results provide some reference value for the engineering application of the angle coefficient method.
作者
李东旭
岳敏楠
李春
缪维跑
LI Dongxu;YUE Minnan;LI Chun;MIAO Weipao(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Yangpu District,Shanghai 200093,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第5期1875-1883,共9页
Proceedings of the CSEE
基金
国家自然科学基金项目(51976131,51676131)。
关键词
翼型
流动分离
仿生翅片
安装角度
气动性能
噪声特性
数值模拟
airfoil
flow separation
bionic fin
installation angle
aerodynamic performance
noise character
numerical simulation
