The flow fields are different for the three phase motion patterns and there are two types of leading-edgevortex motion at an earlier stage of upstroke or downstroke.
三种相位下的涡流场形态各有不同，上挥（下拍）初期前缘涡的运动主要存在两种形态。
2
An analysis of periodic flow streamlines shows that it is probably due to the effect of leadingedgevortex.
通过对沉浮运动一个周期流线图的分析，认为这是翼型前缘涡的影响造成的。
3
As airfoil thickness is increased, the average pressure drag, affected by leadingedgevortex is reduced even to be negative, and meanwhile friction has little increase.