Unsteady flow characteristics of backflow vortices in an axial-flow pump at low flow rates
文献类型：期刊论文
| 作者 | Cai ST(蔡淑婷)2,3; Huang RF(黄仁芳)3; Qian, Zhaohui1; Luo, Xianwu1; Wang YW(王一伟)2,3 |
| 刊名 | JOURNAL OF HYDRODYNAMICS
 |
| 出版日期 | 2025-04-01 |
| 卷号 | 37期号:2页码:359-376 |
| 关键词 | Axial-flow pump backflow vortex pressure fluctuation unsteady flow low flow rates |
| ISSN号 | 1001-6058 |
| DOI | 10.1007/s42241-025-0029-y |
| 通讯作者 | Huang, Ren-fang(hrenfang@imech.ac.cn) |
| 英文摘要 | Axial flow pumps are widely used in water conservancy, petrochemical and agricultural industries. Efficient operation is crucial for energy conservation and emission reduction. Improving efficiency under severe conditions requires studying the internal flow of axial-flow pumps, particularly at low flow rates where backflow vortices form near the impeller inlet. This study investigates the unsteady flow characteristics of backflow vortices at different flow rates in an axial-flow pump. Results show that backflow vortices form when the flow rate decreases to 0.59Qd. As the flow rate further declines, the backflow vortex progresses upstream, contracts, and rebounds. The flow rate range is divided into three stages: Stage I with no backflow vortex, stage II with initial vortex development extending upstream and relatively fragmented, and stage III with vortex contraction and rebound forming a more coherent structure. Besides, backflow vortices induce significant pressure fluctuations and velocity oscillations with the primary frequency being 0.5 fb. They exhibit a three-dimensional spiral motion involving changes in axial length, self-rotation, and revolution around the pump axis, with an angular velocity of approximately half the impeller's rotational speed. This work enhances insights into backflow vortex behaviors, which is essential for optimizing pump design and improving operational stability in challenging environments. |
| 分类号 | 二类 |
| WOS关键词 | RENORMALIZATION-GROUP ANALYSIS ; VORTEX STRUCTURE ; INLET |
| 资助项目 | International Partnership Program of Chinese Academy of Sciences[025GJHZ2022118FN] ; Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City[2021CXLH0003] |
| WOS研究方向 | Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:001550347800004 |
| 资助机构 | International Partnership Program of Chinese Academy of Sciences ; Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City |
| 其他责任者 | 黄仁芳 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/103765]  |
| 专题 | 力学研究所_流固耦合系统力学重点实验室(2012-) |
| 作者单位 | 1.Tsinghua Univ, Dept Energy & Power Engn, Beijing 100084, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 3.Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Cai ST,Huang RF,Qian, Zhaohui,et al. Unsteady flow characteristics of backflow vortices in an axial-flow pump at low flow rates[J]. JOURNAL OF HYDRODYNAMICS,2025,37(2):359-376. |
| APA | 蔡淑婷,黄仁芳,Qian, Zhaohui,Luo, Xianwu,&王一伟.(2025).Unsteady flow characteristics of backflow vortices in an axial-flow pump at low flow rates.JOURNAL OF HYDRODYNAMICS,37(2),359-376. |
| MLA | 蔡淑婷,et al."Unsteady flow characteristics of backflow vortices in an axial-flow pump at low flow rates".JOURNAL OF HYDRODYNAMICS 37.2(2025):359-376. |
入库方式： OAI收割
来源：力学研究所
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