Numerical Prediction of Impact Force in Cavitating Flows

Wang, Hong; Zhu, Baoshan

doi:10.1115/1.4002506

Cited by 15 publications

(7 citation statements)

References 23 publications

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“…Finally, the cavitation erosion characteristics were predicted using the impact pressures on the wall surface induced by the propagating pressure waves induced by the bubble collapses. Similarly, Wang and Zhu [10] applied Large Eddy Simulation (LES) to obtain the unsteady ambient pressures and velocity profiles around the bubbles and employed the Rayleigh-Plesset equation to determine the bubble radius. They predicted the cavitation erosion following the evolution of several representative bubbles in the averaged unsteady flow with cavitation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Cavitation Erosion Aggressiveness Induced by Unsteady Cloud Cavitation

et al. 2020

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A numerical investigation of the erosion aggressiveness of leading edge unsteady cloud cavitation based on the energy balance approach has been carried out to ascertain the main damaging mechanisms and the influence of the free stream flow velocity. A systematic approach has permitted the determination of the influence of several parameters on the spatial and temporal distribution of the erosion results comprising the selection of the cavitation model and the collapse driving pressure. In particular, the Zwart, Sauer and Kunz cavitation models have been compared as well as the use of instantaneous versus average pressure values. The numerical results have been compared against a series of experimental results obtained from pitting tests on copper and stainless steel specimens. Several cavitation erosion indicators have been defined and their accuracy to predict the experimental observations has been assessed and confirmed when using a material-dependent damaging threshold level. In summary, the use of the average pressure levels during a sufficient number of simulated shedding cycles combined with the Sauer cavitation model are the recommended parameters to achieve reliable results that reproduce the main erosion mechanisms found in cloud cavitation. Moreover, the proposed erosion indicators follow a power law as a function of the free stream flow velocity with exponents ranging from 3 to 5 depending on their definition.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Cavitation Erosion Aggressiveness Induced by Unsteady Cloud Cavitation

et al. 2020

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“…Cavitations can significantly reduce the service life of pumps. 1,2 Therefore, pump cavitation, as a main cause of pump damage, should be avoided.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of unsteady cavitation flow in a centrifugal pump at off-design conditions

Tan

Shan

Cao

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part C:

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Unsteady cavitation flows in a centrifugal pump operating under off-design conditions are investigated by using a numerical framework combining the re-normalization group k–ɛ turbulence model and the transport equation-based cavitation model. The reliability and accuracy of the numerical model are demonstrated by the satisfactory agreement between the experimental and numerical values of the pump performance. Under partial discharge, the frequency spectra of the pressure fluctuation at the impeller inlet become more complex as the pump inlet pressure decreases. The maximum amplitude of pressure fluctuation at the blade leading edge for cavitation flow is 2.54 times larger than that for non-cavitation flow because of the violent disturbances caused by cavitation shedding and explosion. Under large discharge, the magnification on the maximum pressure amplitude is 1.6. This finding indicates that cavitation has less influence on pressure fluctuations in the impeller under large discharge than under partial discharge. This numerical simulation demonstrates the evolution of cavitation structure inside the impeller.

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“…In addition, the micro jets and impact forces due to collapse of the cavities can erode the surface of the flow passage components and damage the impeller blades. The service life of the pumps is then reduced greatly [1,2]. Due to the importance of the cavitation phenomenon and the great process in the cavitation and turbulence models, numerical simulations have been widely used to investigate the cavitation flow field in the pumps [3][4][5][6].…”

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confidence: 99%