The head coefficient, power coefficient, and efficiency decreased with increasing axial clearance.
随轴向间隙扩大，超小型泵的扬程系数、功率系数和效率都逐渐降低。
The analysis results show that the maximal value of the pump head coefficient declines when the flow rate increases;
结果表明：迷宫螺旋泵扬程系数最大值随流量的增大而减小；
The non-dimensional pump head coefficient tends to become larger than the quasi-steady value at the very beginning of the start, which indicates obvious transient effect.
在启动初始阶段，无量纲扬程呈现很大值，继而迅速减小到低于准稳态假设值，表现出明显的瞬态效应。
Based on the theory and the experience, the requirements for increasing the head coefficient under the condition of maintaining the efficiency were proposed in this paper.
本文从理论和实例出发，分析了在不降低效率的前提下，提高泵扬程系数的条件。
Based on the theory and the experience, the requirements for increasing the head coefficient under the condition of maintaining the efficiency were proposed in this paper.
本文从理论和实例出发，分析了在不降低效率的前提下，提高泵扬程系数的条件。
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