The result showed that the stream function of vortex tube was expressed as the superposition of the stream functions of vortex filament within the vortex core.
结果显示：涡管流函数是时间的周期函数，并被表征为一系列在涡核内均匀分布螺旋涡丝流函数的叠加。
The thin vortex filament deforms three-dimensionally in the braid and generates stream-wise vortex structures which incline to the region maximum deformation direction of the flow field.
细涡丝在涡辫区的三维演化形成趋向流场最大拉伸变形方向的流向涡结构。
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