Dynamic Characteristics of Rotating Stall in Mixed Flow Pump
Rotating stall, a phenomenon that causes flow instabilities and pressure hysteresis by propagating at some fraction of the impeller rotational speed, can occur in centrifugal impellers, mixed impellers, radial diffusers, or axial diffusers. Despite considerable efforts devoted to the study of rotati...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | Journal of Applied Mathematics |
| Online Access: | http://dx.doi.org/10.1155/2013/104629 |
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| _version_ | 1849308018305400832 |
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| author | Xiaojun Li Shouqi Yuan Zhongyong Pan Yi Li Wei Liu |
| author_facet | Xiaojun Li Shouqi Yuan Zhongyong Pan Yi Li Wei Liu |
| author_sort | Xiaojun Li |
| collection | DOAJ |
| description | Rotating stall, a phenomenon that causes flow instabilities and pressure hysteresis by propagating at some fraction of the impeller rotational speed, can occur in centrifugal impellers, mixed impellers, radial diffusers, or axial diffusers. Despite considerable efforts devoted to the study of rotating stall in pumps, the mechanics of this phenomenon are not sufficiently understood. The propagation mechanism and onset of rotating stall are not only affected by inlet flow but also by outlet flow as well as the pressure gradient in the flow passage. As such, the complexity of these concepts is not covered by the classical explanation. To bridge this research gap, the current study investigated prerotation generated at the upstream of the impeller, leakage flow at the tip clearance between the casing and the impeller, and strong reserve flow at the inlet of the diffuser. Understanding these areas will clarify the origin of the positive slope of the head-flow performance curve for a mixed flow pump. Nonuniform pressure distribution and adverse pressure gradient were also introduced to evaluate the onset and development of rotating stall within the diffuser. |
| format | Article |
| id | doaj-art-1651cbaae64e4732afc19c2ee8b90935 |
| institution | Kabale University |
| issn | 1110-757X 1687-0042 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Applied Mathematics |
| spelling | doaj-art-1651cbaae64e4732afc19c2ee8b909352025-08-20T03:54:33ZengWileyJournal of Applied Mathematics1110-757X1687-00422013-01-01201310.1155/2013/104629104629Dynamic Characteristics of Rotating Stall in Mixed Flow PumpXiaojun Li0Shouqi Yuan1Zhongyong Pan2Yi Li3Wei Liu4Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, ChinaResearch Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, ChinaResearch Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, ChinaSchool of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, ChinaResearch Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, ChinaRotating stall, a phenomenon that causes flow instabilities and pressure hysteresis by propagating at some fraction of the impeller rotational speed, can occur in centrifugal impellers, mixed impellers, radial diffusers, or axial diffusers. Despite considerable efforts devoted to the study of rotating stall in pumps, the mechanics of this phenomenon are not sufficiently understood. The propagation mechanism and onset of rotating stall are not only affected by inlet flow but also by outlet flow as well as the pressure gradient in the flow passage. As such, the complexity of these concepts is not covered by the classical explanation. To bridge this research gap, the current study investigated prerotation generated at the upstream of the impeller, leakage flow at the tip clearance between the casing and the impeller, and strong reserve flow at the inlet of the diffuser. Understanding these areas will clarify the origin of the positive slope of the head-flow performance curve for a mixed flow pump. Nonuniform pressure distribution and adverse pressure gradient were also introduced to evaluate the onset and development of rotating stall within the diffuser.http://dx.doi.org/10.1155/2013/104629 |
| spellingShingle | Xiaojun Li Shouqi Yuan Zhongyong Pan Yi Li Wei Liu Dynamic Characteristics of Rotating Stall in Mixed Flow Pump Journal of Applied Mathematics |
| title | Dynamic Characteristics of Rotating Stall in Mixed Flow Pump |
| title_full | Dynamic Characteristics of Rotating Stall in Mixed Flow Pump |
| title_fullStr | Dynamic Characteristics of Rotating Stall in Mixed Flow Pump |
| title_full_unstemmed | Dynamic Characteristics of Rotating Stall in Mixed Flow Pump |
| title_short | Dynamic Characteristics of Rotating Stall in Mixed Flow Pump |
| title_sort | dynamic characteristics of rotating stall in mixed flow pump |
| url | http://dx.doi.org/10.1155/2013/104629 |
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