基于CFD的球阀三维流场数值模拟  

3D flow numerical simulation of ball valve based on CFD

作　　者：张生昌[1] 张玉林[1] 方志明[1] 柯愈龙[1] 

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310014

出　　处：《排灌机械工程学报》2013年第2期157-161,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：浙江省科研院所研究开发专项资金资助项目(2005F12019)

摘　　要：为了探索新型转子式油气混输泵出口球阀内流场规律,建立球阀流场的三维模型,利用Fluent软件,将标准k-ε湍流模型与多相流技术相结合,采用SIMPLE算法,对新型转子式油气混输泵出口球阀内的三维气液两相流场进行数值模拟.在容积含气率为25%,50%,75%的不同工况下,通过对球阀开启高度分别为3,5,7 mm时的速度场、压力场与气液相分布的分析,探讨在气液混输过程中阀的开启高度及不同气液比对阀内流场的影响规律.模拟结果表明:球阀开启高度越大,阀球上下压差越小;阀隙流速随着开启高度的增大而减小.在气液混输过程中气相介质主要靠近阀球壁流动,同一开启高度下气液比对阀隙流速的影响较小.研究结果直观展现了球阀内流场形态,在一定程度上揭示了气液两相介质在阀内的流动规律,为新型转子式油气混输泵出口球阀的设计与优化提供理论指导.To explore the flow field law of the outlet ball valve of the new rotor oil-gas mixed pump, a 3 D model of ball valve flow field was established. Using Fluent software, combining standard turbulent model and multiphase flow technology together, adopting SIMPLE algorithm, a 3D gas-liquid double- phase flow field in outlet ball valve of new rotor oil-gas mixed pump was numerically simulated. With gas fraction of 25% , 50% and 75% and valve＇s opening height at 3, 5 and 7 mm respectively, velo- city field, pressure field and the distribution of liquid and gas was analyzed. The law of valve＇s ope- ning height and different gas-liquid ratio＇s effect on outlet ball valves in the process of gas-liquid mi- xing was discussed. The simulation results show that, the greater the opening height, the smaller the pressure difference between ball valves. The gap flow velocity decreases as the open height increases. Gas mainly flows in the vicinity of the valve ball in the process of gas-liquid mixing. At the same ope- ning height, gas-liquid ratio has little effect on gap flow velocity. The experiment directly shows flow field forms in the ball valve and, to a certain degree, reveals the law of gas-liquid flow in the ball valve, providing a theoretical guidance for the design and optimization of new rotor oil-gas mixed pump outlet ball valve.

关 键 词：球阀 气液两相 数值模拟 气液比 开启高度 

分 类 号：S277.9[农业科学—农业水土工程] TH326[农业科学—农业工程]