Numerical simulation of cavitating turbulent flow through a Francis turbine

被引：1
|
作者：
Zhang, L. [1 ]
Liu, J. T. [1 ]
Wu, Y. L. [1 ]
Liu, S. H. [1 ]
机构：
[1] Ertan Hydropower Dev Co, Chengdu 610021, Peoples R China
来源：
26TH IAHR SYMPOSIUM ON HYDRAULIC MACHINERY AND SYSTEMS, PTS 1-7 | 2013年 / 15卷
关键词：
D O I：
10.1088/1755-1315/15/6/062028
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
The unsteady cavitating turbulent flow in a Francis turbine is simulated based on governing equations of the mixture model for cavity-liquid two-phase flows with the RNG k-epsilon turbulence model in the present paper. An improved mass transfer expression in the mixture model is obtained based on evaporation and condensation mechanics with considering the effects of the non-dissolved gas, the turbulence, the tension of interface at cavity and the effect of phase change rate and so on. The governing equations of the mixture model for the unsteady cavitating-liquid flow is solved by a direct coupling method numerically with the finite volume method (FVM) using the unstructured tetrahedron grid and the structured hexahedral grid system. This direct coupling simulation was successfully applied to simulate the cavitating two-phase turbulent flow through a Francis turbine. The simulated external results agreed well with the experimental results.
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页数：7
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