一种新的尾迹-地面干扰修正方法

摘要

When predicting the rotor aerodynamics in ground effect with a vortex wake method, part of the wake vorties may move below the ground. The "non-physical" phenomenon makes it hard for the wake to be iterated to convergence and the wake geometry to be predicted correctly. To solve this problem, a new method called "Constant Volume Rectification" is proposed for the problem based on low-speed incompressible flow theory. The new approach is found on theorical basis, and it can rectify the vortices near the ground to a proper position. Examples show that the determination model incorporating the method predicts the locations of the vortices near ground accurately, and the wake iteration convergence rate is accelerated to some extent.%在使用涡尾迹方法对处于地面效应状态下的旋翼进行气动计算时,会出现由于部分涡丝运动至地面下方而导致的尾迹迭代不易收敛、尾迹结构计算不够准确等问题.针对这一问题,基于空气的低速不可压理论,提出了一种新的尾迹-地面干扰修正办法.该方法与之前的方法相比,能将地面附近的涡丝修正到更准确的位置.算例表明,引入该方法的计算模型,获得的尾迹位置总体精度提高,尾迹迭代的收敛速度也有所增加.