排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2012, Vol. 30 Issue (1): 1-5    DOI: 10.3969/j.issn.1674-8530.2012.01.001
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Cavitation model with noncondensable gas effect and its numerical simulation
SONG Yu,CAO Shu-Liang
(State Key Laboratory of Hydro Science Engineering,Tsinghua University,Beijing 100084, China)
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Abstract A transport equationbased cavitation model was developed according to the homogeneous assumption in this paper.The mechanism of evaporation and condensation was considered in the model.The noncondensable gas was also taken into account in cavity formation and development.The RNG turbulence model was employed with a modified turbulent viscosity according to the mixed density.The proposed model was implemented to simulate the steady cavitating flow around a NACA66 airfoil.The pressure coefficient distributions on the suction side of the foil agreed well with the experiment results.Furthermore,the effects of noncondensable gas,inlet turbulent kinetic energy and turbulence dissipation rate on the cavity length were evaluated.The proper values of noncondensable gas,inlet turbulent kinetic energy and turbulence dissipation were selected.Then,the proposed model was applied to an unsteady cavitating flow.The numerical results clearly reflected the whole process of the cavitationcloud generation,growth,dispersion and collapse.The simulation showed re-entrant jet is one of the main reasons for the breakoff process.The Strouhal number obtained agreed well with the experiment results.The overall results prove the reliability of the proposed model in cavitating flow simulations.
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SONG Yu
CAO Shu-Liang
Key wordscavitation model   non condensable gas   state equation   turbulence model   re-entrant jet   numerical simulation     
Received: 2011-05-07; Published: 2012-01-30
Cite this article:   
SONG Yu,CAO Shu-Liang. Cavitation model with noncondensable gas effect and its numerical simulation[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(1): 1-5.
 
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