Prediction of Cavitation Intensity and Erosion Area in Centrifugal Pump by Using Cavitating Flow Simulation with Bubble Flow Model

Fukaya, Masashi; Tamura, Yoshiaki; Matsumoto, Yoichiro

doi:10.1299/kikaib.74.2116

Cited by 1 publication

(2 citation statements)

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“…Cavitation erosion in pumps has a closer correlation with microscopic bubble motion near the impeller blade surface than with the macroscopic cavitation length from the viewpoint of the mechanism for cavitation erosion. We developed a numerical simulation code with the bubble model for cavitating flows to simulate the detailed bubble behavior [11][12][13]50 . Not only volumetric bubble motion but also transitional bubble motion is modeled and the distribution of bubble nuclei in the cavitating flow is also taken into account.…”

Section: Prediction Of Cavitation Intensity and Erosion Area In Amentioning

confidence: 99%

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Multiscale Analysis on Cavitating Flow

Matsumoto

Okita

2011

6th AIAA Theoretical Fluid Mechanics Conference

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Cavitating flow is consisted of various scale phenomena such as each bubble motion and continuum bubbly flow. It is required to take those phenomena into account and to simulate those flows combining detail each bubble motion and wave phenomena in the cavitating bubbly flow. Reduced-order models are introduced to taken into account the compressibility of liquid and the internal phenomena of bubbles. The nonlinear behavior of the spherically symmetric bubble cloud is numerically investigated at various frequency and pressure amplitude conditions. As the result, when the amplitude of the pressure fluctuation is high enough to generate nonlinear waveform which has much higher harmonics components inside the cloud, the pressure wave strongly focuses at the cloud center. On the other hand, we apply our numerical simulation code with the bubble model for cavitating flows to predict the cavitation erosion in a centrifugal pump. The predicted high cavitation intensity area, which is estimated by analyzing the bubble pressure and bubble nuclei distribution in the flow, agrees well with the experimental erosion area.

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Section: Prediction Of Cavitation Intensity and Erosion Area In Amentioning

confidence: 99%

“…Cavitation models are categorized as bubble model [10][11][12][13][14] , barotropic model [15][16][17] and phase change model [18][19][20][21][22][23][24][25][26][27] . Firstly, in the bubble model, the volume fraction of gas is calculated using the bubble radius which is governed by Rayleigh-Plesset equation.…”

Section: Introductionmentioning

confidence: 99%