直升机涡环状态边界的确定对直升机飞行安全具有重要意义。
To predict helicopter vortex ring state boundary is necessary for flight safety.
涡系诱导作用增强，对侧向力和法向力都有增值。
Enhancement of the vortical effect can benefit both the side force and the normal force.
最后，对尾流中涡街形成的机理进行了初步讨论。
Finally, the mechanism of vortex street is briefly discussed.
最后，对尾流中涡街形成的机理进行了初步讨论。
Finally, the mechanism of vortex street is briefly discussed.
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