卡门涡街与翼型的相互作用

本文利用保角变换,用离散涡方法求解了卡门涡街与翼型的相互作用。较详细地分析了它作为偶极子声源的特性,并模拟了在涡翼相互作用过程中尾迹的发生和演化。计算结果表明:在相互作用时,尾迹所吸收的声能可以是正值也可以是负值;升力和声偶极子强度出现了周期性脉动,这种脉动与翼型的振动和噪声有直接的关系。

KARMAN VORTEX STREET-AIRFOIL INTERACTION

. Based on the discrete vortex method, a conformal mapping technique is used to solve Karman vortex street-airfoil interaction. The characteristics of the interaction as an acoustic source of dipole type arc investigated and the evolution of the wake is simulated. Calculating results show that the sound power absorbed by the wake may be positive or negative during the time process. It is also found that the strength of acoustic dipole in the far field and airfoil lift appear periodic fluctuation. This kind of periodic fluctuation is one of the main reasons, which is responsible for the aerodynamic noise and for the oscillation of airfoils.