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Huang, Renfang; Ji, Bin; Luo, Xianwu; Zhai, Zhihong; Zhou, Jiajian
Journal of mechanical science and technology, 09/2015, Volume: 29, Issue: 9Journal Article
Turbulent cavitating flows in a mixed-flow waterjet pump were numerically investigated using the k -ω SST turbulence model and the mass transfer cavitation model based on the Rayleigh-Plesset equation to provide a comprehensive understanding of the cavitation-vortex interaction mechanism. The predicted hydraulic performance, as well as the cavitation performance, exhibits a reasonable agreement with the experimental results. The vorticity distributions under three operation conditions were illustrated together. Based on the illustration, cavitation development enhances vorticity production and flow unsteadiness in a mixed-flow waterjet pump. Vortices are basically located at the cavity interface, particularly at the downstream interface, during cavitation. Further analyses using the relative vorticity transport equation in cavitating turbulent flows indicate that vortex dilation and baroclinic torque exhibit a steep jump as cavitation occurs. In addition, vortex stretching contributes mainly to large-scale vortex generation.
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