Startup Characteristics of a Centrifugal Pump Delivering Gas-Liquid Two-Phase Flow
Startup Characteristics of a Centrifugal Pump Delivering Gas-Liquid Two-Phase Flow
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DOI：
10.1155/2014/782619
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发表时间：
2014-05
影响因子：
2.1
通讯作者：
Yu‐Liang Zhang;Jun-Jian Xiao;Jianhao Yu;Y. Ji
中科院分区：
文献类型：
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作者：
Yu‐Liang Zhang;Jun-Jian Xiao;Jianhao Yu;Y. Ji
近年来，由于工程上的迫切需要，离心泵启动过程中的瞬态性能越来越受到人们的关注。为了确定输送气液两相流的高比转速原型离心泵的瞬态启动特性，采用动态滑移区法对泵内瞬态流动进行了数值模拟。结果表明，泵分别输送纯水和气液两相流时，扬程的差异主要集中在启动后期。气相的存在使得压头小于输送纯水的压头。无因次水头系数在起动初期非常高，然后迅速下降到一个稳定值。叶片前缘攻角的不断变化是导致启动期内流场演变的主要原因。
The transient performance of centrifugal pumps during the startup period has drawn more and more attention in recent years due to urgent engineering needs. In order to make certain the transient startup characteristics of a high specific-speed prototype centrifugal pump delivering the gas-liquid two-phase flow, the transient flows inside the pump are numerically simulated during the startup period using the dynamic slip region method in this paper. The results show that the difference in heads mainly focuses on the later stage of the startup period when the pump is used to transmit the pure water and the gas-liquid two-phase flow, respectively. The existence of the gas phase makes the head less than that of delivering pure water. The nondimensional head coefficient is very high at the very beginning of the startup period and then quickly drops to a stable value. The continuous variation of the attack angle at the leading edges of blades is the main reason for evolution of the internal flow field during the startup period.