Numerical Simulation and Experimental Study on the Gas-liquid Two-phase Flow in the Pump During the Gas Cut-off Transition Process
This study aims at elucidating the flow mechanism and characterizing the internal pump flow properties during the gas cut-off transition process. High-speed photography (HSP) served for visualizing the flow patterns within a transparent centrifugal pump model fabricated from plexiglass. Numerical si...
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Isfahan University of Technology
2025-06-01
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| Series: | Journal of Applied Fluid Mechanics |
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| Online Access: | https://www.jafmonline.net/article_2686_0388878ea2a99f1ea38ff6503c36f160.pdf |
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| author | F. Yang J. Zhang C. Shao |
| author_facet | F. Yang J. Zhang C. Shao |
| author_sort | F. Yang |
| collection | DOAJ |
| description | This study aims at elucidating the flow mechanism and characterizing the internal pump flow properties during the gas cut-off transition process. High-speed photography (HSP) served for visualizing the flow patterns within a transparent centrifugal pump model fabricated from plexiglass. Numerical simulation was conducted on the gas-liquid two-phase flow within the pump in the gas cut-off transition process using the Eulerian-Eulerian heterogeneous flow model coupled with the SST k-ω turbulence model. The experimental observations from HSP served as validation for the numerical simulation results. During the gas cut-off transition process, with a decreasing gas volume fraction (GVF), the pressure in the volute gradually increases until it ultimately exhibits periodic variation. The time-averaged pressure exhibits a steady increase with the flow. The GVF slowly diminishes along volute’s radial direction. As a consequence of impeller rotation, the outlet pressure rises with the decreasing integral rate of the gas phase inside the impeller. Concurrently, the integral rate at the outlet has not yet changed, so the change in outlet GVF consistently lags behind the change in outlet pressure. The centrifugal pump completes the gas cut-off transition process when fluctuations in the outlet GVF cease. This investigation revealed the temporal evolution of GVF and pressure during the centrifugal pump's gas cut-off transition process, and established a quantitative criterion for determining the completion of this process. The research results are beneficial for more deeply comprehending the pump's performance, and well contribute to the reliable operation and structural optimization pertaining to centrifugal pumps. |
| format | Article |
| id | doaj-art-ef5a2ecdbba249b9b7aa4f19f0c9a054 |
| institution | OA Journals |
| issn | 1735-3572 1735-3645 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj-art-ef5a2ecdbba249b9b7aa4f19f0c9a0542025-08-20T02:30:39ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35721735-36452025-06-011881980199210.47176/jafm.18.8.33372686Numerical Simulation and Experimental Study on the Gas-liquid Two-phase Flow in the Pump During the Gas Cut-off Transition ProcessF. Yang0J. Zhang1C. Shao2College of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, ChinaCollege of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, ChinaCollege of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, ChinaThis study aims at elucidating the flow mechanism and characterizing the internal pump flow properties during the gas cut-off transition process. High-speed photography (HSP) served for visualizing the flow patterns within a transparent centrifugal pump model fabricated from plexiglass. Numerical simulation was conducted on the gas-liquid two-phase flow within the pump in the gas cut-off transition process using the Eulerian-Eulerian heterogeneous flow model coupled with the SST k-ω turbulence model. The experimental observations from HSP served as validation for the numerical simulation results. During the gas cut-off transition process, with a decreasing gas volume fraction (GVF), the pressure in the volute gradually increases until it ultimately exhibits periodic variation. The time-averaged pressure exhibits a steady increase with the flow. The GVF slowly diminishes along volute’s radial direction. As a consequence of impeller rotation, the outlet pressure rises with the decreasing integral rate of the gas phase inside the impeller. Concurrently, the integral rate at the outlet has not yet changed, so the change in outlet GVF consistently lags behind the change in outlet pressure. The centrifugal pump completes the gas cut-off transition process when fluctuations in the outlet GVF cease. This investigation revealed the temporal evolution of GVF and pressure during the centrifugal pump's gas cut-off transition process, and established a quantitative criterion for determining the completion of this process. The research results are beneficial for more deeply comprehending the pump's performance, and well contribute to the reliable operation and structural optimization pertaining to centrifugal pumps.https://www.jafmonline.net/article_2686_0388878ea2a99f1ea38ff6503c36f160.pdfcentrifugal pumpgas-liquid two-phase flowhigh-speed photographygas cut-off transition processnumerical simulation |
| spellingShingle | F. Yang J. Zhang C. Shao Numerical Simulation and Experimental Study on the Gas-liquid Two-phase Flow in the Pump During the Gas Cut-off Transition Process Journal of Applied Fluid Mechanics centrifugal pump gas-liquid two-phase flow high-speed photography gas cut-off transition process numerical simulation |
| title | Numerical Simulation and Experimental Study on the Gas-liquid Two-phase Flow in the Pump During the Gas Cut-off Transition Process |
| title_full | Numerical Simulation and Experimental Study on the Gas-liquid Two-phase Flow in the Pump During the Gas Cut-off Transition Process |
| title_fullStr | Numerical Simulation and Experimental Study on the Gas-liquid Two-phase Flow in the Pump During the Gas Cut-off Transition Process |
| title_full_unstemmed | Numerical Simulation and Experimental Study on the Gas-liquid Two-phase Flow in the Pump During the Gas Cut-off Transition Process |
| title_short | Numerical Simulation and Experimental Study on the Gas-liquid Two-phase Flow in the Pump During the Gas Cut-off Transition Process |
| title_sort | numerical simulation and experimental study on the gas liquid two phase flow in the pump during the gas cut off transition process |
| topic | centrifugal pump gas-liquid two-phase flow high-speed photography gas cut-off transition process numerical simulation |
| url | https://www.jafmonline.net/article_2686_0388878ea2a99f1ea38ff6503c36f160.pdf |
| work_keys_str_mv | AT fyang numericalsimulationandexperimentalstudyonthegasliquidtwophaseflowinthepumpduringthegascutofftransitionprocess AT jzhang numericalsimulationandexperimentalstudyonthegasliquidtwophaseflowinthepumpduringthegascutofftransitionprocess AT cshao numericalsimulationandexperimentalstudyonthegasliquidtwophaseflowinthepumpduringthegascutofftransitionprocess |