Effect of impeller inlet diameter on saddle-shaped positive slope and non-uniform flow patterns at low flow rates of a mixed-flow pump
Most mixed-flow pumps obtain a saddle-like Q-P curve with a backflow, owing to the increased incidence angle at low flow rates. The backflow was developed near the shroud and followed downstream again at its end to form a recirculating flow. The rotating stall, which could be a part of the recircula...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2022-12-01
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| Series: | Engineering Applications of Computational Fluid Mechanics |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/19942060.2022.2074544 |
| _version_ | 1828345494769762304 |
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| author | Yong-In Kim Hyeon-Mo Yang Kyoung-Yong Lee Young-Seok Choi |
| author_facet | Yong-In Kim Hyeon-Mo Yang Kyoung-Yong Lee Young-Seok Choi |
| author_sort | Yong-In Kim |
| collection | DOAJ |
| description | Most mixed-flow pumps obtain a saddle-like Q-P curve with a backflow, owing to the increased incidence angle at low flow rates. The backflow was developed near the shroud and followed downstream again at its end to form a recirculating flow. The rotating stall, which could be a part of the recirculating flow, followed the impeller’s rotational direction, and its properties affected the local stability. The reattaching flow became strong when the upstream flow from the blade leading edge deviated from the same circumferential degree as the dominant flow of the rotating stall heading downstream. The fluctuation in the total pressure rise decreased when the average incidence angle was smaller than that of the design flow rate. As a passive control to suppress the saddle and the above flow patterns, the impeller inlet diameter was reduced from the shroud, and the inlet blade angle was further adjusted to maintain the incidence angle. From the reduced inlet diameter, the backflow was mostly suppressed, and the saddle was improved with a wider operating range. Here, the performance near the design flow rate was almost maintained. The stability was evaluated using the fast Fourier transform, and the numerical method was validated through experimental tests. |
| first_indexed | 2024-04-14T00:12:43Z |
| format | Article |
| id | doaj.art-d198f3c4d7f949f580950245c5b7bd02 |
| institution | Directory Open Access Journal |
| issn | 1994-2060 1997-003X |
| language | English |
| last_indexed | 2024-04-14T00:12:43Z |
| publishDate | 2022-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Engineering Applications of Computational Fluid Mechanics |
| spelling | doaj.art-d198f3c4d7f949f580950245c5b7bd022022-12-22T02:23:17ZengTaylor & Francis GroupEngineering Applications of Computational Fluid Mechanics1994-20601997-003X2022-12-011611131115310.1080/19942060.2022.2074544Effect of impeller inlet diameter on saddle-shaped positive slope and non-uniform flow patterns at low flow rates of a mixed-flow pumpYong-In Kim0Hyeon-Mo Yang1Kyoung-Yong Lee2Young-Seok Choi3Industrial Technology (Green Process and Energy System Engineering), University of Science and Technology, Daejeon, South KoreaCarbon Neutral Technology R&D Department, Research Institute of Clean Manufacturing System, Korea Institute of Industrial Technology, Cheonan, South KoreaCarbon Neutral Technology R&D Department, Research Institute of Clean Manufacturing System, Korea Institute of Industrial Technology, Cheonan, South KoreaIndustrial Technology (Green Process and Energy System Engineering), University of Science and Technology, Daejeon, South KoreaMost mixed-flow pumps obtain a saddle-like Q-P curve with a backflow, owing to the increased incidence angle at low flow rates. The backflow was developed near the shroud and followed downstream again at its end to form a recirculating flow. The rotating stall, which could be a part of the recirculating flow, followed the impeller’s rotational direction, and its properties affected the local stability. The reattaching flow became strong when the upstream flow from the blade leading edge deviated from the same circumferential degree as the dominant flow of the rotating stall heading downstream. The fluctuation in the total pressure rise decreased when the average incidence angle was smaller than that of the design flow rate. As a passive control to suppress the saddle and the above flow patterns, the impeller inlet diameter was reduced from the shroud, and the inlet blade angle was further adjusted to maintain the incidence angle. From the reduced inlet diameter, the backflow was mostly suppressed, and the saddle was improved with a wider operating range. Here, the performance near the design flow rate was almost maintained. The stability was evaluated using the fast Fourier transform, and the numerical method was validated through experimental tests.https://www.tandfonline.com/doi/10.1080/19942060.2022.2074544Mixed-flow pumpimpeller inlet diametersaddlebackflowrotating stallrecirculating flow |
| spellingShingle | Yong-In Kim Hyeon-Mo Yang Kyoung-Yong Lee Young-Seok Choi Effect of impeller inlet diameter on saddle-shaped positive slope and non-uniform flow patterns at low flow rates of a mixed-flow pump Engineering Applications of Computational Fluid Mechanics Mixed-flow pump impeller inlet diameter saddle backflow rotating stall recirculating flow |
| title | Effect of impeller inlet diameter on saddle-shaped positive slope and non-uniform flow patterns at low flow rates of a mixed-flow pump |
| title_full | Effect of impeller inlet diameter on saddle-shaped positive slope and non-uniform flow patterns at low flow rates of a mixed-flow pump |
| title_fullStr | Effect of impeller inlet diameter on saddle-shaped positive slope and non-uniform flow patterns at low flow rates of a mixed-flow pump |
| title_full_unstemmed | Effect of impeller inlet diameter on saddle-shaped positive slope and non-uniform flow patterns at low flow rates of a mixed-flow pump |
| title_short | Effect of impeller inlet diameter on saddle-shaped positive slope and non-uniform flow patterns at low flow rates of a mixed-flow pump |
| title_sort | effect of impeller inlet diameter on saddle shaped positive slope and non uniform flow patterns at low flow rates of a mixed flow pump |
| topic | Mixed-flow pump impeller inlet diameter saddle backflow rotating stall recirculating flow |
| url | https://www.tandfonline.com/doi/10.1080/19942060.2022.2074544 |
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