中文摘要：

随着工程应用的拓展和系统复杂程度的提高，离心泵在瞬态操作条件下的瞬态性能已被更多的研究与应用。本文借助于叶轮机械的瞬态欧拉方程式对各类瞬态过程中可能存在的瞬态行为进行了详细的定性分析。为深入揭示离心泵在启动过程中的瞬态行为，通过算例对瞬时附加理论扬程和附加理论轴功率进行了定量计算。结果显示：直叶片离心泵中的瞬态行为只可能与角加速度项有关，而与流动惯性项无关；角加速度项总体上要比流动惯性项数值要大，表明启动过程中的转速上升特性对瞬态行为有着极其重要的影响。本研究将为各类涡轮机械的瞬态性能研究提供了较好的参考，进一步丰富了叶轮机械流动理论。

英文摘要：

With the extending of engineering application and the enhanced system requirements, the studies and applications of transient performance of centrifugal pump have attracted the growing attention dur- ing operation periods. In this paper, the transient behaviors were qualitatively analyzed in detail using the transient Euler equation of turbomachinery during all kinds of operation periods. To deeply reveal the transient behavior of centrifugal pump during startup period, the instantaneous additional theory heads and additional theory power were quantitatively calculated by using a startup case. The theoretical results seem to show that the transient behavior is only relevant to the angular acceleration term possibly in straight blade centrifugal pump, and not relevant to the flowing inertia term. The angular acceleration term is higher than the flowing inertia term as a whole, this manifests that the rise characteristic of rota- tional speed plays dominant role for the transient behavior. This study will provide valuable reference for the transient performance of all kinds of turbomachinery, and further enrich the flow theory of turboma- chinery.