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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。
In the aerodynamic calculation of rotor blades under ground effect using the vortex trail method, some problems such as the convergence of the tail iteration not easily converging and the calculation of the wake structure not accurate enough due to the movement of some vortices to the ground below will occur. In response to this problem, a new wake-ground disturbance correction method is proposed based on the air-based low-speed incompressible theory. Compared with the previous method, this method can correct the vortex wire near the ground to a more accurate position. The example shows that the computational model introduced by this method can improve the overall accuracy of the wake position and the convergence speed of wake iteration.