Numerical Investigation of Fluid Flow Mechanism in the Back Shroud Cavity of a Centrifugal Pump
A detailed analysis on the fluid flow distribution in the back shroud cavity is significant for accurately calculat-ing axial forces in the operation of centrifugal pumps. The numerical calculation results and the experimental results were basically consistent on the performance of the centrifugal p...
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2018-01-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | http://jafmonline.net/JournalArchive/download?file_ID=45407&issue_ID=248 |
| _version_ | 1818154110893948928 |
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| author | W. Dong W. L. Chu |
| author_facet | W. Dong W. L. Chu |
| author_sort | W. Dong |
| collection | DOAJ |
| description | A detailed analysis on the fluid flow distribution in the back shroud cavity is significant for accurately calculat-ing axial forces in the operation of centrifugal pumps. The numerical calculation results and the experimental results were basically consistent on the performance of the centrifugal pump and the fluid flow characteristics in the back shroud cavity. Distribution of velocity field was researched in the back shroud cavity. We plot the axial distribution curves of the dimensionless circumferential and radial components of velocity of the fluid inside the cavity with different angles and radii. We then analyze the fluid pressure distribution in the back shroud cavity and compare it with experimental results. Results show that the fluid flow in the back shroud cavity involves the core area and the fluid leakage. Results also show that the fluid in the core area behaves like a revolving rigid body. At the operating points of the same flow rate, the cross-sectional area of the volute directly affects the flow rate of the fluid in the back shroud cavity, significantly restricting the fluid flow in that component. How-ever, the flow pattern in the turbulent boundary layer is strongly affected by the leakage flow; hence, the distri-bution of velocity is not axially symmetric. When the flow rate increases from 0.8 Qsp to 1.2 Qsp, the radial dif-ferential pressure between the sealing ring and the volute decreases. Meanwhile, the disc friction loss of the impeller-to-wall inside the back shroud cavity tends to be more circumferentially or radially equal, whereas the radial leakage rate in the back shroud cavity tends to decrease. The fluid flow in the back shroud cavity compris-es the circumferential shear flow and radial differential pressure flow and is considered as a 2D viscous laminar flow. |
| first_indexed | 2024-12-11T14:21:18Z |
| format | Article |
| id | doaj.art-604fb02502ad4cae9799f9ec6eb44b49 |
| institution | Directory Open Access Journal |
| issn | 1735-3572 |
| language | English |
| last_indexed | 2024-12-11T14:21:18Z |
| publishDate | 2018-01-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-604fb02502ad4cae9799f9ec6eb44b492022-12-22T01:02:53ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35722018-01-01113709719.Numerical Investigation of Fluid Flow Mechanism in the Back Shroud Cavity of a Centrifugal PumpW. Dong0W. L. Chu1School of Power and Energy, Northwestern Polytechnical University, Xi'an 710129, ChinaCollaborative Innovation Center of Advanced Aero-Engine, Beijing, 100191, ChinaA detailed analysis on the fluid flow distribution in the back shroud cavity is significant for accurately calculat-ing axial forces in the operation of centrifugal pumps. The numerical calculation results and the experimental results were basically consistent on the performance of the centrifugal pump and the fluid flow characteristics in the back shroud cavity. Distribution of velocity field was researched in the back shroud cavity. We plot the axial distribution curves of the dimensionless circumferential and radial components of velocity of the fluid inside the cavity with different angles and radii. We then analyze the fluid pressure distribution in the back shroud cavity and compare it with experimental results. Results show that the fluid flow in the back shroud cavity involves the core area and the fluid leakage. Results also show that the fluid in the core area behaves like a revolving rigid body. At the operating points of the same flow rate, the cross-sectional area of the volute directly affects the flow rate of the fluid in the back shroud cavity, significantly restricting the fluid flow in that component. How-ever, the flow pattern in the turbulent boundary layer is strongly affected by the leakage flow; hence, the distri-bution of velocity is not axially symmetric. When the flow rate increases from 0.8 Qsp to 1.2 Qsp, the radial dif-ferential pressure between the sealing ring and the volute decreases. Meanwhile, the disc friction loss of the impeller-to-wall inside the back shroud cavity tends to be more circumferentially or radially equal, whereas the radial leakage rate in the back shroud cavity tends to decrease. The fluid flow in the back shroud cavity compris-es the circumferential shear flow and radial differential pressure flow and is considered as a 2D viscous laminar flow.http://jafmonline.net/JournalArchive/download?file_ID=45407&issue_ID=248Centrifugal pump; Back shroud cavity; Circumferential velocity component; Radial velocity component; Pres-sure. |
| spellingShingle | W. Dong W. L. Chu Numerical Investigation of Fluid Flow Mechanism in the Back Shroud Cavity of a Centrifugal Pump Journal of Applied Fluid Mechanics Centrifugal pump; Back shroud cavity; Circumferential velocity component; Radial velocity component; Pres-sure. |
| title | Numerical Investigation of Fluid Flow Mechanism in the Back Shroud Cavity of a Centrifugal Pump |
| title_full | Numerical Investigation of Fluid Flow Mechanism in the Back Shroud Cavity of a Centrifugal Pump |
| title_fullStr | Numerical Investigation of Fluid Flow Mechanism in the Back Shroud Cavity of a Centrifugal Pump |
| title_full_unstemmed | Numerical Investigation of Fluid Flow Mechanism in the Back Shroud Cavity of a Centrifugal Pump |
| title_short | Numerical Investigation of Fluid Flow Mechanism in the Back Shroud Cavity of a Centrifugal Pump |
| title_sort | numerical investigation of fluid flow mechanism in the back shroud cavity of a centrifugal pump |
| topic | Centrifugal pump; Back shroud cavity; Circumferential velocity component; Radial velocity component; Pres-sure. |
| url | http://jafmonline.net/JournalArchive/download?file_ID=45407&issue_ID=248 |
| work_keys_str_mv | AT wdong numericalinvestigationoffluidflowmechanisminthebackshroudcavityofacentrifugalpump AT wlchu numericalinvestigationoffluidflowmechanisminthebackshroudcavityofacentrifugalpump |