MAWJ喷嘴流场数值模拟及磨损预估研究  

Flow Field Numerical Simulation and Wear Prediction of Micro-Abrasive Water Jet Nozzle

作　　者：陈忠敏[1] 雷玉勇[1] 欧玥[1] 万庆丰[1] 潘峥正[1] 

机构地区：[1]西华大学机械工程与自动化学院,四川成都610039

出　　处：《液压气动与密封》2013年第5期10-14,共5页Hydraulics Pneumatics & Seals

基　　金：四川省科技厅项目资助(2011JYZ017)

摘　　要：为得到湍流场流动和喷嘴磨损的特征,该文对喷嘴内液-固两相湍流流场进行数值模拟。利用液-固两相湍流控制方程,建立喷嘴内流场的二维仿真模型,采用交错网格和有限差分法离散方程,通过SIMPLEC法求解。运用FLUENT软件分析速度场、颗粒分布规律、颗粒运动轨迹以及射流特性,得到两相分离流动、出口中心处射流速度最大、颗粒沿管壁分布的特点。研究喷嘴形状与尺寸参数对喷嘴内部流场的影响,结果表明收敛锥角小、聚焦管长的喷嘴,喷射出的射流动能更大,但对喷嘴的磨损也最严重。喷嘴聚焦管出口壁面的磨损率达到1.1×10-4以上,磨损深度在4.7×10-4mm以上,且呈现递增趋势。研究为优化MAWJ。In order to obtain characteristics of turbulent flow and nozzle wear, the numerical simulation of liquid-solid two-phase turbulent flow in nozzle was carried out. According to governing equations for liquid-solid two-phase turbulent flow, the two- dimensional simulation of flow model in nozzle was established. Staggered mesh and finite difference method are used for dispersing governing equations, and then the SIMPLEC method is applied to solve the equations. Velocity field, particle distribution pattern, particle movement locus, and MAWJ character are analyzed using the FLUENT. The results show that two-phase is separated flow, export center jet speed is maximal, and particles distribute along the focus tube wall. The shape and dimension parameters have influence to the flow field in nozzle. The outcome is more kinetic energy of jet with long focus tube and small convergence taper. On the other hand, nozzle wear is more serious. The wear rate of focus tube export wall is over 1.1×10^-4, the wear depth is more than 4.7×10^-4mm, and the results are increasing. This research provides a theoretical basis for optimization nozzle structure. It can be used for optimizing parameters to make the better function and longer useful life nozzle.

关 键 词：微磨料水射流 湍流 数值模拟 磨损预估 

分 类 号：TP601[自动化与计算机技术—控制理论与控制工程]