轴向旋涡流是离心叶轮内特殊的流动现象，它的速度分布规律与叶轮特性关系密切。
Relative eddy is a special flow phenomenon, occurring within centrifugal impeller passage. Its speed distribution is closely related to impeller characteristics.
通过摄像法得出了旋涡表面流体质点的运动轨迹、切向和轴向时均速度。
Moving path lines, tangential and axial average velocities of particles at the vortex surface are obtained by the photography method.
建立了二维浅水流动的旋涡诱导速度公式，在已知旋涡场和胀量场时，由该表达式可确定流动速度场。
A formula is deduced for the velocity induced by the vortices in two-dimensional shallow water flows and it is used to correct the Biot-Savart law.
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