The transient continuously distributive vortex can be replaced by a number of discrete point vortexes . the trajectory of vortex movement was computed with the method of discrete vortex and the axial vortex movement in the inlet side of the pump system was simulated 将泵入口侧连续分布的涡量场离散成有限数目的离散涡，用离散涡方法计算涡系位置的演化，模拟泵入口涡量场的轴向涡流运动。
