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.
轴向旋涡流动是离心叶轮叶片之间一种特殊的相对流动，其流动规律是离心叶轮正反问题研究的重要基础。
Relative eddy is a special relative flow within centrifugal blade passage, which is of prime importance in flow study of pumps.
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.
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