前混合磨料水射流喷嘴磨损规律的数值模拟  

Numerical Simulation of the Wear Law of Pre-Mixed Abrasive Water Jet Nozzle

作　　者：管金发[1] 邓松圣[1] 伍建林[1] 舒丹[1] 

机构地区：[1]中国人民解放军后勤工程学院军事供油工程系,重庆401331

出　　处：《重庆理工大学学报（自然科学）》2016年第12期48-54,共7页Journal of Chongqing University of Technology：Natural Science

基　　金：总后勤部军需物资油料部项目(YX213C208);后勤工程学院青年科研基金资助项目(YQ14-420701)

摘　　要：建立了前混合磨料水射流喷嘴物理模型。基于FLUENT软件,采用颗粒轨道模型、Grant弹性恢复系数和E/CRC磨损模型数值分析了射流参数、磨料参数对磨料水射流喷嘴内表面磨损特性的影响规律。结果表明:在不同射流参数、磨料参数条件下,喷嘴壁面磨损速率均呈现双峰特性,均在喷嘴圆柱段入口处前较短距离范围内和喷嘴圆柱段取得较大值,而喷嘴其他部位磨损速率很小;以喷嘴壁面磨损速率面积分表征喷嘴的整体磨损程度,随着磨料水射流流量和磨料体积分数的增加、磨料颗粒粒径的减小,喷嘴壁面磨损速率面积分逐渐增加,喷嘴内表面磨损程度增加。因此,从减小喷嘴内表面磨损的角度,磨料水射流流量和磨料体积分数不宜过大。综合考虑减小喷嘴内表面磨损和防止喷嘴堵塞两方面的要求,磨料颗粒粒径不宜过大。Physical model of pre-mixed abrasive water jet nozzle was established. Based on the software of FLUENT,numerical simulation of the effects of jet parameters and abrasive parameters on wear characteristic of abrasive water jet nozzle was carried out by using particle trajectory model,Grant collision elastic recovery coefficients and E / CRC erosion model. The simulation results showed that the nozzle wall wear rate all present two peaks at different jet parameters and abrasive parameters.In other words,the nozzle wall wear rate at a short distance range before the entrance of cylindrical section of nozzle and cylindrical section of nozzle are larger compared with other places. The overall wear degree of the nozzle is characterized by the surface integral of nozzle wall wear rate. The surface integral of nozzle wall wear rate increases,namely the overall wear degree of the nozzle increases with the increase of abrasive water jet flux and abrasive volume fraction,and with the decrease of abrasive particle size. Therefore,abrasive water jet flux and abrasive volume fraction should not be too large from the point of view of reducing the wear of the nozzle. Taking account of reducing the wear of the nozzle and preventing clogging of nozzle together,abrasive particle size also should not be too large.

关 键 词：磨料水射流 喷嘴磨损 数值模拟 流量 磨料体积分数 

分 类 号：TP62[自动化与计算机技术—控制理论与控制工程]