Optimization of a centrifugal pump to improve hydraulic efficiency and reduce hydro-induced vibration

Energy, Journal Year: 2023, Volume and Issue: 268, P. 126677 - 126677

Published: Jan. 16, 2023

Language: Английский

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Unsteady behaviour and plane blade angle configurations' effects on pressure fluctuations and internal flow analysis in axial flow pumps

Alexandria Engineering Journal, Journal Year: 2024, Volume and Issue: 99, P. 83 - 107

Published: May 11, 2024

Pumps play a crucial role in various applications, and this study employs the CFD method to simulate internal flow of an axial pump. Utilizing three-dimensional model with real clearances, our investigation focuses on pump's pressure pulsation under diverse operating conditions. Specifically, we operated pump at varying blade angles (30°, 45°, 60°, 75°) determine transient fields, aiming identify both qualitative quantitative characteristics. In line current research practices, present comparison between numerical calculations experimental results, revealing reasonable agreement. The simulation results highlight influence rate plane angle key parameters such as static pressure, dynamic total velocity magnitude fluctuations, shear stress. Notably, increases near or tip, hydraulic becomes more evident different highest are observed 45-degree angle. These findings provide valuable insights for enhancing performance pumps. To ascertain model's accuracy reliability, establishes side-by-side predictions data, demonstrating satisfactory level simulations yield critical into performance, emphasizing profound sensitivity variations angle, understanding optimizing behavior.

Language: Английский

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The mechanism of internal energy losses in double suction centrifugal pumps under direct and reverse conditions

Energy, Journal Year: 2024, Volume and Issue: 306, P. 132547 - 132547

Published: July 24, 2024

Language: Английский

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Investigation of role of fins in a Francis turbine model's cavitation-induced instabilities under design and off-design conditions

Energy, Journal Year: 2024, Volume and Issue: 292, P. 130514 - 130514

Published: Jan. 30, 2024

Language: Английский

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Energy performance and pressure fluctuation in multi-stage centrifugal pump with floating impellers under various axial oscillation frequencies

Energy, Journal Year: 2024, Volume and Issue: 307, P. 132691 - 132691

Published: Aug. 3, 2024

Language: Английский

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Effect of the radial gap size on the deterministic flow in a centrifugal pump due to impeller-tongue interactions

Energy, Journal Year: 2023, Volume and Issue: 278, P. 127820 - 127820

Published: May 13, 2023

The research on the flow in centrifugal pumps is quite broad and covers most of relevant issues. However, studies are focused steady behaviors less literature available for dynamic interactions. Unsteady mechanisms energy transfer sources impeller-tongue interaction can be identified using deterministic decomposition flow. Probably, important effect to considered radial gap or spacing between impeller exit diameter volute tongue location. numerical dataset a full 3D URANS model pump has been employed study detail size unsteady fluctuations velocity field within pump, analysis as main novelty. developed by authors already tested towards prediction pressure inside volute, at exit. new results presented here allow see impact both geometrical operating parameters discharge momentum exchange. In particular, four different gaps (23.2%, 17.0%, 11.4% 8.8% diameter) operated five rates (from 20% 160% nominal rate) have numerically resolved analyzed. reveals major clearance blade-to-blade patterns impeller, especially low rates. viscous induces that high 40% time-averaged value. Moreover, this non-linear term perceived up 1.5 times higher case reductions from 23.2% diameter. There not prevailing component, pure temporal dependence found. On contrary, influence tangential responsible evolution torque, found key parameter. Therefore, blockage consequence torque assigned influence. All post-processing routines provided precise picture all classic involved: jet-wake pattern interaction, acoustic wave propagations recirculating cells off-design conditions. Hence, useful tool analyze it envisages introduction variables objective functions design optimization algorithms.

Language: Английский

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Digital twin modeling and operation optimization of the steam turbine system of thermal power plants

Energy, Journal Year: 2023, Volume and Issue: 290, P. 129969 - 129969

Published: Dec. 17, 2023

Language: Английский

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Performance prediction and optimization of hydrogenation feed pump based on particle swarm optimization – least squares support vector regression surrogate model

Engineering Applications of Computational Fluid Mechanics, Journal Year: 2024, Volume and Issue: 18(1)

Published: Feb. 22, 2024

Due to high power consumption and low energy efficiency of the hydrogenation feed multistage pump, conducting structural optimization design reducing losses for this pump is necessary. In study, an method based on particle swarm (PSO) algorithm least squares support vector regression (LSSVR) surrogate model proposed. The head are taken as objectives two impellers carried out. Through model, increased by 3.99% 2.91%, respectively. It found that optimized impeller has more stable flow characteristics than original impeller. Further, entropy production introduced analyze loss pump. result shows PSO-LSSVR can reduce 9% under nominal rate. attributed inhibitory effect scheme horseshoe vortex at leading edge wake trailing This study provides a new idea centrifugal pumps.

Language: Английский

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Investigation of energy dissipation mechanism and the influence of vortical structures in a high-power double-suction centrifugal pump

Physics of Fluids, Journal Year: 2023, Volume and Issue: 35(7)

Published: July 1, 2023

The extensive applications of double-suction centrifugal pumps consume a considerable amount energy. It is urgent to reveal the detailed energy dissipation generation and find critical factor for pump performance enhancement. In this investigation, internal flow field was obtained by solving Reynolds averaged Navier–Stokes equations. entropy production method utilized calculate visualize irreversible dissipation. Omega vortex identify vortical structures determine temporal spatial relationship between vortices. results indicate that in main regions hydraulic loss, accounting 54%–71% turbulent impeller volute casing dominated variation efficiency. near-wall positively correlated with rate, but impact insignificant casing. Although suction chamber contributed minimally backflows at inlet were relieved near ribs, reduced when blade leading edges passed ribs. By adopting identification, wake vortices, separation their interactions determined correlate strongly loss channels cutwaters. Furthermore, these vortices influenced back flows from sidewall gaps. Additionally, study can also provide foundational principles optimal design type pump.

Language: Английский

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The influence of ring clearance on the performance of a double-suction centrifugal pump

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(2)

Published: Feb. 1, 2024

Due to the complex structure of a double-suction pump's suction chamber, flow in cavity is often ignored numerical simulations because difficulties structured hexahedral meshing. However, wear ring clearance interlinking pump chamber leads fluid at impeller inlet directly area. This significantly impacts internal field, so influence on cannot be ignored. paper develops four three-dimensional models with different clearances investigate their performance, and meshes were used for all computational domains. The varied from 0.2 0.5 mm 0.1 increments. influences energy loss, external characteristics, field distribution simulated via verified dynamics method. results show that leakage decreases rate increases clearance. increase backflow an disorder inside impeller, resulting decreased head efficiency. Energy loss mainly caused by increasing turbulence entropy production Also, low-pressure region expands volute clearance, outlet pressure decreases. study's research provides reference design application centrifugal pumps.

Language: Английский

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