文章基本信息

标题：Unsteady flow characteristic analysis of a centrifugal pump under over-load operating conditions
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作者：Xiaoran Zhao ; Yexiang Xiao ; Zhengwei Wang 等
期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：240
期号：3
页码：1-9
DOI：10.1088/1755-1315/240/3/032002
出版社：IOP Publishing
摘要：Unsteady flow phenomena, including flow separation, vortex flow, back flow and interaction between tip vortex and main flow, can occur in the centrifugal pump under over-load working conditions. Previous researches mainly focus on the flow characteristic under part-load working conditions, which is quite different from cases at over-load conditions. In this paper, flow characteristics are investigated in a centrifugal pump by CFD technology. The SST-CC turbulence model is adopted to perform steady simulations and the SAS-CC model is used in unsteady simulations of the centrifugal pump under 1.00Q_BEP - 1.45Q_BEP working conditions. Flow characteristic is proceeded with energy loss analysis by entropy method and pressure amplitude spectra. The results indicate that there appears a significant vortex core inside the impeller when the flow rate is larger than 1.28Q_BEP and the flow in the diffusing part and tongue region of the volute is complicated with several swirling vortices. The main frequency and amplitude are also investigated. There exists an evident low-frequency component near the volute tongue under over-load conditions, which is related to the vortices and flow separation inside the volute.