Numerical simulation on turbulent flow field in convergentdiveroent nozzle  

作　　者：LU Yi-yu LIU Yongc LI Xiao-hong KANG Yong ZHAO Jian-xin 

机构地区：[1]College of Resources and Environmental Science, Chongqing Univerisity, Chongqing 400030, China

出　　处：《Journal of Coal Science & Engineering(China)》2009年第4期434-439,共6页煤炭学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China (50621403,50604019);Program for New Century Excellent Talents in Univer sity(NCET-06-0767)

摘　　要：Because of the complication of turbulence＇s mechanism and law as well as the jet pressure in nozzle is difficult to test by experiment, five turbulent models were applied to numerically simulate the turbulent flow field in convergent-divergent nozzle. Theory analysis and experiment results of mass flow rates conclude that the RNG k-ε model is the most suitable model. The pressure distribution in the convergent-divergent nozzle was revealed by computational fluid dynamic （CFD） simulating on the turbulent flow field under different pressure conditions. The growing conditions of cavitation bubbles were shown; meanwhile, the phenomena in the experiment could be explained. The differential pres- sure between the upstream and downstream in nozzle throat section can improve the cavitating effect of cavitation water jet.Because of the complication of turbulence's mechanism and law as well as thejet pressure in nozzle is difficult to test by experiment, five turbulent models were appliedto numerically simulate the turbulent flow field in convergent-divergent nozzle. Theoryanalysis and experiment results of mass flow rates conclude that the RNG к-з model is themost suitable model. The pressure distribution in the convergent-divergent nozzle was revealed by computational fluid dynamic (CFD) simulating on the turbulent flow field underdifferent pressure conditions. The growing conditions of cavitation bubbles were shown;meanwhile, the phenomena in the experiment could be explained. The differential pressure between the upstream and downstream in nozzle throat section can improve thecavitating effect of cavitation water jet.

关 键 词：numerical simulation convergent-divergent nozzle turbulent flow field cavitation water jet cavitating effect 

分 类 号：O357.5[理学—流体力学] TS105.411[理学—力学]