摘要
为提高磨料水射流加工性能和延长喷嘴使用寿命,基于欧拉-欧拉方法和离散粒子模型,利用CFD仿真技术探究磨料水射流喷头内部的三相流运动,建立磨料水射流喷头的物理模型,并通过与文献实验结果对比,验证模型的可靠性。通过自定义粒子圆度系数,利用CFD模拟分析粒子圆度系数对粒子出口速度及管壁磨损率的影响。结果表明:射流压力和磨料圆度越大,磨料出口速度越大,喷嘴内磨损越小;磨料流量和磨料圆度系数越大,磨料出口速度越小,喷嘴内磨损越大;磨料尺寸越小和磨料圆度越大,磨料出口速度越大,喷嘴内磨损也越大;水射流切割过程中的深宽比随着压力增大而增大,随着横移速度和靶距的增加而减小,随着粒子圆度的增大而增大。
In order to improve the processing performance of abrasive water jet and prolong the service life of nozzles,based on Euler-Euler approach and discrete particle model,the three-phase flow in the nozzle of abrasive water jet was studied by computational fluid dynamics(CFD).The physical model of abrasive water jet nozzle was established,and the correctness and accuracy of the model was verified by comparing with the experimental results in literature.According to the user-defined particle sphericity,the effect of particle sphericity on the particle exit speed and the wall erosion rate were analyzed by CFD.The simulation results show that with the increase of jet pressure and particle sphericity,the outlet speed of the particles is increased and the wear in the nozzle is decreased.With the increase of abrasive flow rate and particle sphericity,the outlet speed of the particles is increased and the wear in the nozzles is increased.With the decrease of particle size and the increase of particle sphericity,both the outlet speed of the particles and the wear in the nozzle are increased.The aspect ratio of depth and width during the cutting process is increased with the increase of jet pressure,decreased with the increase of transverse velocity and target distance,and increased with the increase of particle sphericity.
作者
强争荣
马毅青
缪小进
武美萍
李玉亭
QIANG Zhengrong;MA Yiqing;MIAO Xiaojin;WU Meiping;LI Yuting(School of Mechanical Engineering,Jiangnan University,Wuxi Jiangsu 214122,China;Department of Industrial and Systems Engineering,The University of Tennessee-Knoxville,Knoxville 37996,USA)
出处
《润滑与密封》
CAS
CSCD
北大核心
2020年第7期62-67,共6页
Lubrication Engineering
基金
国家自然科学基金项目(51575237)
创新型人才国际合作培养项目(201600090095).
关键词
磨料水射流
计算流体动力学
运动轨迹
管壁磨损
abrasive waterjet
computational fluid dynamics
movement track
wall erosion
