Based on the grey correlation analytical method in the grey systematic theory, this paper has put forward a kind of new method of calculating propagation time of flow.
基于灰色系统理论中的灰色关联分析方法，提出了一种新的流量传播时间的推算方法。
Its structure and application are produced and theory of short circuit flow field is put forward.
介绍了其构造及在煤矿中的应用，提出了短路流场理论。
The fan structure is introduced, function and mechanism are analyzed and theory of short-circuit flow field is put forward.
作者介绍了其构造，对风机的作用机理进行了分析，提出了短路流场理论。
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