CFD Simulation of Centrifugal Pump with Different Impeller Blade Trailing Edges
The centrifugal pump is one of the most widely used types of power machinery in the field of ship and ocean engineering, and the shape of the impeller blade trailing edge has an important influence on their performance. To reveal the mechanism of the effect of different trailing edges on external pe...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/11/2/402 |
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| author | Hui Li Yongjun Chen Yang Yang Shixin Wang Ling Bai Ling Zhou |
| author_facet | Hui Li Yongjun Chen Yang Yang Shixin Wang Ling Bai Ling Zhou |
| author_sort | Hui Li |
| collection | DOAJ |
| description | The centrifugal pump is one of the most widely used types of power machinery in the field of ship and ocean engineering, and the shape of the impeller blade trailing edge has an important influence on their performance. To reveal the mechanism of the effect of different trailing edges on external performance, the internal flow of 16 types of impeller blade trailing edges of a centrifugal pump, consisting of Bezier trailing edges, rounding on the pressure side, cutting on the suction side, and the original trailing edge is studied by numerical simulation. The reverse flow, shaft power, and energy loss distribution in the impeller and diffuser along the streamwise direction are analyzed by calculating them on each micro control body sliced from the fluid domain. The entropy production theory and Ω-vortex identification method are used to display the magnitude and location of energy loss and the vortex structure. Finally, a static structural analysis of the impeller with different trailing edges is performed. The results show that different impeller trailing edges can clearly affect the efficiency of the pump, i.e., the thinner the trailing edge, the higher the efficiency, with the thickest model reducing efficiency by 5.71% and the thinnest model increasing efficiency by 0.59% compared to the original one. Changing the shape of the impeller trailing edge has a great influence on the reverse flow, shaft power, and energy loss near the impeller trailing edge and diffuser inlet but has little influence on the leading part of the impeller. The distribution of local entropy production rate, energy loss, and reverse flow along the streamwise direction shows similar rules, with a local maximum near the leading edge of the impeller due to the impact effect, and a global maximum near the impeller trailing edge resulting from strong flow separation and high vortex strength due to the jet-wake flow. Thinning the impeller trailing edge and smoothing its connection with the blade can reduce the vortex strength and entropy production near the impeller trailing edge and diffuser inlet, improve the flow pattern, and reduce energy loss, thus improving the pump efficiency. In all models, the maximum equivalent stress is less than 6.5 MPa and the maximum total deformation is less than 0.065mm. The results are helpful for a deeper understanding of the complex flow mechanism of the centrifugal pump with different blade trailing edges. |
| first_indexed | 2024-03-11T08:36:11Z |
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| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-11T08:36:11Z |
| publishDate | 2023-02-01 |
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| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-e53a845a927346c297824b63b1a54bd72023-11-16T21:28:40ZengMDPI AGJournal of Marine Science and Engineering2077-13122023-02-0111240210.3390/jmse11020402CFD Simulation of Centrifugal Pump with Different Impeller Blade Trailing EdgesHui Li0Yongjun Chen1Yang Yang2Shixin Wang3Ling Bai4Ling Zhou5National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, ChinaShanghai Panda Machinery (Group) Co., Ltd., Shanghai 201704, ChinaCollege of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, ChinaNational Research Center of Pumps, Jiangsu University, Zhenjiang 212013, ChinaNational Research Center of Pumps, Jiangsu University, Zhenjiang 212013, ChinaNational Research Center of Pumps, Jiangsu University, Zhenjiang 212013, ChinaThe centrifugal pump is one of the most widely used types of power machinery in the field of ship and ocean engineering, and the shape of the impeller blade trailing edge has an important influence on their performance. To reveal the mechanism of the effect of different trailing edges on external performance, the internal flow of 16 types of impeller blade trailing edges of a centrifugal pump, consisting of Bezier trailing edges, rounding on the pressure side, cutting on the suction side, and the original trailing edge is studied by numerical simulation. The reverse flow, shaft power, and energy loss distribution in the impeller and diffuser along the streamwise direction are analyzed by calculating them on each micro control body sliced from the fluid domain. The entropy production theory and Ω-vortex identification method are used to display the magnitude and location of energy loss and the vortex structure. Finally, a static structural analysis of the impeller with different trailing edges is performed. The results show that different impeller trailing edges can clearly affect the efficiency of the pump, i.e., the thinner the trailing edge, the higher the efficiency, with the thickest model reducing efficiency by 5.71% and the thinnest model increasing efficiency by 0.59% compared to the original one. Changing the shape of the impeller trailing edge has a great influence on the reverse flow, shaft power, and energy loss near the impeller trailing edge and diffuser inlet but has little influence on the leading part of the impeller. The distribution of local entropy production rate, energy loss, and reverse flow along the streamwise direction shows similar rules, with a local maximum near the leading edge of the impeller due to the impact effect, and a global maximum near the impeller trailing edge resulting from strong flow separation and high vortex strength due to the jet-wake flow. Thinning the impeller trailing edge and smoothing its connection with the blade can reduce the vortex strength and entropy production near the impeller trailing edge and diffuser inlet, improve the flow pattern, and reduce energy loss, thus improving the pump efficiency. In all models, the maximum equivalent stress is less than 6.5 MPa and the maximum total deformation is less than 0.065mm. The results are helpful for a deeper understanding of the complex flow mechanism of the centrifugal pump with different blade trailing edges.https://www.mdpi.com/2077-1312/11/2/402centrifugal pumpblade trailing edgeBezier curveinternal flowentropy productionΩ-vortex identification |
| spellingShingle | Hui Li Yongjun Chen Yang Yang Shixin Wang Ling Bai Ling Zhou CFD Simulation of Centrifugal Pump with Different Impeller Blade Trailing Edges Journal of Marine Science and Engineering centrifugal pump blade trailing edge Bezier curve internal flow entropy production Ω-vortex identification |
| title | CFD Simulation of Centrifugal Pump with Different Impeller Blade Trailing Edges |
| title_full | CFD Simulation of Centrifugal Pump with Different Impeller Blade Trailing Edges |
| title_fullStr | CFD Simulation of Centrifugal Pump with Different Impeller Blade Trailing Edges |
| title_full_unstemmed | CFD Simulation of Centrifugal Pump with Different Impeller Blade Trailing Edges |
| title_short | CFD Simulation of Centrifugal Pump with Different Impeller Blade Trailing Edges |
| title_sort | cfd simulation of centrifugal pump with different impeller blade trailing edges |
| topic | centrifugal pump blade trailing edge Bezier curve internal flow entropy production Ω-vortex identification |
| url | https://www.mdpi.com/2077-1312/11/2/402 |
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