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。
An analysis of periodic flow streamlines shows that it is probably due to the effect of leading edge vortex.
由于前缘涡的影响，翼型厚度增加，平均压差阻力系数变小，甚至会出现负值。
As airfoil thickness is increased, the average pressure drag, affected by leading edge vortex is reduced even to be negative, and meanwhile friction has little increase.
另外，后缘喷流可以减弱乃至消除前缘涡混掺现象的发生，进而有利于飞行器的操纵。
In addition, the trailing edge jets may weaken or even eliminate the mixing phenomenon of the leading edge vortex, which is in advantage of the flight control of aircraft.
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