Impact of Outlet Pressure on Internal Flow Characteristics and Energy Loss in Pump-Turbine System Under Pump Operation Conditions
During pump operation, the pump-turbine system experiences unstable fluctuations in outlet pressure, which induces turbulence and additional energy losses. Understanding the impact of outlet pressure variations on the internal flow field is crucial for the further development of turbine units. This...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-12-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/18/1/110 |
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| author | Tianding Han Qifei Li Licheng Feng Xiangyu Chen Feng Zhou Zhenggui Li |
| author_facet | Tianding Han Qifei Li Licheng Feng Xiangyu Chen Feng Zhou Zhenggui Li |
| author_sort | Tianding Han |
| collection | DOAJ |
| description | During pump operation, the pump-turbine system experiences unstable fluctuations in outlet pressure, which induces turbulence and additional energy losses. Understanding the impact of outlet pressure variations on the internal flow field is crucial for the further development of turbine units. This study employs numerical methods to systematically analyze the effects of outlet pressure changes on flow characteristics and energy loss. The results show that a decrease in outlet pressure to P0.9BEP significantly increases entropy production in the double-row stay guide vane region, primarily due to flow separation and vortex formation. In the flow passage, sealing gap, and tailpipe regions, entropy production is mainly driven by wall effects, while secondary flows influence the spiral case. The vortex distribution in the double-row stay guide vane is complex, with different variation trends observed in the active and fixed guide vane regions. Outlet pressure changes affect the interaction between the flow passage blades and the fluid, leading to localized flow separation and directly impacting energy loss in downstream components. Additionally, the rate of change in outlet pressure significantly influences vortex generation and dissipation. This research provides new theoretical insights and research directions for performance optimization and energy loss control in pump-turbine systems. |
| format | Article |
| id | doaj-art-2d0baffb25ef4c519a34c3ed06b04054 |
| institution | Kabale University |
| issn | 1996-1073 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-2d0baffb25ef4c519a34c3ed06b040542025-01-10T13:17:07ZengMDPI AGEnergies1996-10732024-12-0118111010.3390/en18010110Impact of Outlet Pressure on Internal Flow Characteristics and Energy Loss in Pump-Turbine System Under Pump Operation ConditionsTianding Han0Qifei Li1Licheng Feng2Xiangyu Chen3Feng Zhou4Zhenggui Li5College of New Energy Engineering, Jiuquan Vocational Technical College, Jiuquan 735000, ChinaSchool of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, ChinaCollege of New Energy Engineering, Jiuquan Vocational Technical College, Jiuquan 735000, ChinaSchool of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, ChinaSchool of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, ChinaSchool of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, ChinaDuring pump operation, the pump-turbine system experiences unstable fluctuations in outlet pressure, which induces turbulence and additional energy losses. Understanding the impact of outlet pressure variations on the internal flow field is crucial for the further development of turbine units. This study employs numerical methods to systematically analyze the effects of outlet pressure changes on flow characteristics and energy loss. The results show that a decrease in outlet pressure to P0.9BEP significantly increases entropy production in the double-row stay guide vane region, primarily due to flow separation and vortex formation. In the flow passage, sealing gap, and tailpipe regions, entropy production is mainly driven by wall effects, while secondary flows influence the spiral case. The vortex distribution in the double-row stay guide vane is complex, with different variation trends observed in the active and fixed guide vane regions. Outlet pressure changes affect the interaction between the flow passage blades and the fluid, leading to localized flow separation and directly impacting energy loss in downstream components. Additionally, the rate of change in outlet pressure significantly influences vortex generation and dissipation. This research provides new theoretical insights and research directions for performance optimization and energy loss control in pump-turbine systems.https://www.mdpi.com/1996-1073/18/1/110multiphase flowthe separate trailing edge flappressure gradientair blocking phenomenon |
| spellingShingle | Tianding Han Qifei Li Licheng Feng Xiangyu Chen Feng Zhou Zhenggui Li Impact of Outlet Pressure on Internal Flow Characteristics and Energy Loss in Pump-Turbine System Under Pump Operation Conditions Energies multiphase flow the separate trailing edge flap pressure gradient air blocking phenomenon |
| title | Impact of Outlet Pressure on Internal Flow Characteristics and Energy Loss in Pump-Turbine System Under Pump Operation Conditions |
| title_full | Impact of Outlet Pressure on Internal Flow Characteristics and Energy Loss in Pump-Turbine System Under Pump Operation Conditions |
| title_fullStr | Impact of Outlet Pressure on Internal Flow Characteristics and Energy Loss in Pump-Turbine System Under Pump Operation Conditions |
| title_full_unstemmed | Impact of Outlet Pressure on Internal Flow Characteristics and Energy Loss in Pump-Turbine System Under Pump Operation Conditions |
| title_short | Impact of Outlet Pressure on Internal Flow Characteristics and Energy Loss in Pump-Turbine System Under Pump Operation Conditions |
| title_sort | impact of outlet pressure on internal flow characteristics and energy loss in pump turbine system under pump operation conditions |
| topic | multiphase flow the separate trailing edge flap pressure gradient air blocking phenomenon |
| url | https://www.mdpi.com/1996-1073/18/1/110 |
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