在流场中某一区域如果涡量不为零，称在这一区域中流动是有旋的，也称旋涡运动。
本文的目的是用数值计算方法来研究离心式压气机叶轮内的旋涡运动。
The objective of the present paper is to study the vortices motions in the impeller ofvaneless diffuser of centrifugal compressor by numerical computations.
自由旋涡气动窗口是利用流体微团作自由旋涡运动的离心力来平衡大气与光腔压力差，来作为高能激光束的输出窗口。
The free vortex aerodynamics window is used to be the window of high power laser beam, which takes advantage of the centripetal force of the free vortex motion of fluid.
这种旋涡结构可能是由于A本影的逆时针自旋运动造成的。
The formation of this spiral structure may be caused by the anti-clockwise spin of umbra "A".
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