摘要
本文就二维平板从理论上证明了改进涡格法的超收敛性。用该方法研究了近地升力面尾涡卷起的地面效应。尾涡面上的自由线涡方向应与当地流线方向一致,通过迭代满足这一非线性边界条件的确定尾涡的形状。地面效应以镜象涡系模拟。一系列计算结果表明迭代迅速收敛。本文讨论了升力面距地高度对尾涡位置和形状的影响,计算表明当该高度小于一定距离后,尾涡呈现不稳定。
The superconvergence of an improved vortex lattice method for a two-dimensional flat plate has been verified theoretically. The improved vortex lattice method is used to predict the ground effect on wake roll-up behind a lifting surface. The wake geometry is obtained through iteration by satisfying the condition that free vortex lines are consistent with the local streamlines. The ground effect is simulated by use of an image vortex system. Numerical results show rapid convergence of the iterative procedure. The effect of height-above-ground is discussed. The wake vortex becomes unstable as the lifting surface descends too close to the ground.
出处
《空气动力学学报》
CSCD
北大核心
1989年第4期383-393,共11页
Acta Aerodynamica Sinica
关键词
地面效应
尾涡
涡格法
ground effect, vortex lattice method, superconvergence.
