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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。
With the expansion of engineering applications and the increase of system complexity, the transient performance of centrifugal pumps under transient operating conditions has been more studied and applied. In this paper, the transients Euler equation of the impeller is used to conduct a detailed qualitative analysis of the transient behaviors that may exist in all kinds of transient processes. In order to reveal the transient behavior of the centrifugal pump during start-up, the transient additional theoretical lift and additional theoretical shaft power are quantitatively calculated. The results show that the transient behavior of straight vane centrifugal pump may only be related to the angular acceleration term, but not to the flow inertia term. The angular acceleration term is generally larger than the value of the flow inertia term, indicating that the rotational speed rising characteristic Transient behavior has an extremely important effect. This study will provide a good reference for the research on the transient performance of various types of turbomachinery, further enriching the impeller mechanical flow theory.