Effects of cavitation on the hydrodynamic loading and wake vortex evolution of a pre-swirl pump-jet propulsor

Ocean Engineering, Journal Year: 2022, Volume and Issue: 266, P. 113069 - 113069

Published: Nov. 13, 2022

Language: Английский

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Unsteady Pressure Pulsations in Pumps—A Review

Energies, Journal Year: 2022, Volume and Issue: 16(1), P. 150 - 150

Published: Dec. 23, 2022

Unsteady pressure-pulsation-induced severe vibration and high alternating stress can cause some unexpected results, including impeller crack structural damage of the entire pumping system. In present paper, a review on pressure pulsations in pumps is carried out based published studies. A comprehensive view from several aspects discussed detail. The contents studies include mechanism rotor–stator interaction; prediction model experimental numerical investigations pulsations; unsteady rotating-stall-induced at off-design flow rates; relationship between pulsation internal structure cavitation; reduction caused by effective approaches. It concluded that closely associated with complex structures, for instance separation, cavitation, rotating stall. interaction mainly dominates characterized discrete components spectrum. To reduce pulsation, approaches are proposed, such as increasing gap, staggered blade, blade modification. Finally, suggestions future works given considering current research. contributes to better understanding centrifugal pumps, may also benefit engineers controlling fields, nuclear reactor.

Language: Английский

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Cavitation analysis through CFD in industrial pumps: A review

International Journal of Thermofluids, Journal Year: 2023, Volume and Issue: 20, P. 100506 - 100506

Published: Nov. 1, 2023

Cavitation is one of the most detrimental fluid-dynamic anomalies that occur to turbomachines. It mainly affects machines characterized by high rotation speeds and clear distinctions between low pressure zones, where cavitation first appears. During years, starting from well known Rayleigh formulation for formation bubbles in a liquid medium, many models have been proposed analyse phenomenon. Spanning higher simplifications more detailed formulations, range applications these wide led different quality results, methodology not fully established when regarding specific sectors, example industrial pumps. Restricting application field few, kinds pumps, i.e centrifugal, axial flow external gear mixed this article analyses main literature sources order give an overall view Computational Fluid Dynamic their

Language: Английский

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Role of particle motion on pressure fluctuation and erosion for a centrifugal pump in energy storage pump station

Journal of Energy Storage, Journal Year: 2024, Volume and Issue: 99, P. 113252 - 113252

Published: Aug. 8, 2024

Language: Английский

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Influence of runner cone profile and axial water jet injection in a low head Francis turbine at part load

Sustainable Energy Technologies and Assessments, Journal Year: 2021, Volume and Issue: 50, P. 101810 - 101810

Published: Nov. 29, 2021

Language: Английский

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Effects of Blade Number on the Centrifugal Pump Performance: A Review

Arabian Journal for Science and Engineering, Journal Year: 2022, Volume and Issue: 47(7), P. 7945 - 7961

Published: Jan. 12, 2022

Language: Английский

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A review on the application of hybrid RANS-LES methods in hydraulic machinery

Ocean Engineering, Journal Year: 2024, Volume and Issue: 305, P. 117943 - 117943

Published: April 30, 2024

Language: Английский

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Numerical study of rotating cavitation and pressure pulsations in a centrifugal pump impeller

AIP Advances, Journal Year: 2024, Volume and Issue: 14(10)

Published: Oct. 1, 2024

To investigate the variations in flow field of centrifugal pumps with different cavitation numbers, this study utilized shear stress transport k–ω turbulence model and Zwart–Gerber–Belamri to examine correlation between stall vortices flow. The findings indicate that consistently coincides formation vortices, distribution mirrors pattern vortex structure. Cavitation tends develop aggregate around obstructing a significant portion inlet areas within channel. As number decreases, both area intensity increase. For cavitations margins σ = 0.41, 0.23, 0.15, we observed propagation frequencies at fs 2.7, 1.8, 0.9 Hz respectively, as these decrease relative impeller movement until reaching near-stationary states. pressure pulsations various channels exhibit distinct phase differences; smaller cavity numbers result larger disparities along gradual reduction pulsation amplitude. These discoveries present effective strategies for controlling reducing fluctuations pumps, thereby enhancing overall stability.

Language: Английский

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Multiparameter and Multiobjective Optimization Design Based on Orthogonal Method for Mixed Flow Fan

Energies, Journal Year: 2020, Volume and Issue: 13(11), P. 2819 - 2819

Published: June 2, 2020

Optimization design of an impeller is critical for the energy performance a fan. This paper takes promotion fan efficiency and pressure rise as optimization objectives to carry out multiparameter multiobjective research. Firstly, experimental test bench built measure original verify accuracy numerical method. Then, hub outlet angle β1, increment Δβ1, wrap φ, diffuser β2, Δβ2 are set optimal parameters conduct orthogonal design. The results show that increases by 11.71%, 50.15%. velocity distributions in uniform, internal flow separation weakened, influence tip leakage reduced, which makes improvement

Language: Английский

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Performance optimization and investigation of flow phenomena on tidal turbine blade airfoil considering cavitation and roughness

Applied Ocean Research, Journal Year: 2020, Volume and Issue: 106, P. 102463 - 102463

Published: Dec. 5, 2020

Language: Английский

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