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.
本文提出了确定气动窗口所需自由旋涡气动特性的过程，讨论了特征线方法在非对称超音速喷管设计中的应用，该喷管被用来产生自由旋涡流动。
In this article the procedures are described for determining free vortex segment properties. Characteristics method is used to design nozzle which produces free vortex segment.
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.
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