Study on external performance and internal flow characteristics in a centrifugal pump under different degrees of cavitation
Study on external performance and internal flow characteristics in a centrifugal pump under different degrees of cavitation
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不同空化程度下离心泵外性能及内部流动特性研究
DOI：
10.1063/5.0133377
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发表时间：
2023-01-01
影响因子：
4.6
通讯作者：
Zhu, ZuChao
中科院分区：
文献类型：
--
作者：
Jia, XiaoQi;Zhang, Yong;Zhu, ZuChao
汽蚀作为离心泵内部非定常流动的一种形式，会导致泵的性能下降、内部流态紊乱和流动损失。目前用于确定空化发生的标准是3%的水头下降。然而，在大多数情况下，由于内部流动状态的显着变化，泵的气蚀已经发生了不到1%-2%的水头下降。为了研究离心泵在空化初期，当扬程曲线没有明显波动时，随着空化程度的加深，泵内流动特性的变化规律，以一台低比转速离心泵为研究对象，分析了泵内总压、转速、汽泡体积、涡结构、和熵产，得到了泵的内部流动特性和流动损失规律，为离心泵的抗汽蚀水力设计提供了依据。
Cavitation as a form of unsteady flow within centrifugal pumps can cause the reduced performance of pumps, disordered internal flow regimes, and flow loss. The present criterion used for determining the occurrence of cavitation is a 3% head drop. However, in most cases, pump cavitation already occurs with less than a 1%-2% head drop due to significant changes in the internal flow status. To examine changing patterns in internal flow characteristics as the degree of cavitation deepens in the early stage of cavitation in centrifugal pumps when the head curve does not show significant fluctuation, this paper focuses on a low specific speed centrifugal pump to analyze distributions of total internal pressure, speed, bubble volume, vortex structure, and entropy generation across different degrees of cavitation and obtain internal flow characteristics and flow loss patterns of pumps, with an aim of providing preferences for anti-cavitation hydraulic design of centrifugal pumps.