摘要
针对钛合金人工关节表面软性磨粒流加工问题,对磨粒流加工流场中的磨粒运动仿真方法进行了实验研究。首先,根据欧拉法,在经典N-S方程的基础上推导出了RANS方程,结合标准k-ε湍流补充方程共同构建了湍流模型;然后,根据拉格朗日法,建立了单颗磨粒的运动方程,在此基础上提出了一种湍流分散方法来重新构建湍流速度脉动,运用欧拉-拉格朗日法对固液两相进行了耦合,借助COMSOL软件对磨粒流加工流场进行了模拟仿真,对流场速度分布、压力分布以及磨粒运动轨迹等仿真结果进行了讨论和分析;最后,搭建实验平台进行了加工实验。研究结果表明:湍流分散方法能有效还原湍流的速度脉动特征,磨粒的运动仿真结果在一定程度上符合实验中磨粒的运动情况,磨粒流对钛合金人工关节表面具有良好的加工效果。
Aiming at the problem of soft abrasive flow machining for the surface of titanium alloy artificial joint,the simulation method of abrasive movement in the abrasive flow field and the machining experiment were studied. First,the RANS equations were deduced based on NS equations with Euler method,which combined with the k-ε equations to construct the turbulence model. Then,the movement equation of single abrasive particle was established by Lagrange method. Based on that,a turbulent dispersion method was proposed to reconstruct the turbulent velocity fluctuation. The solid and liquid phases were coupled with Euler-Lagrange method and the abrasive flow field was simulated with COMSOL software. The simulation results of flow field velocity distribution,pressure distribution and abrasive movement trajectory were discussed and analyzed. Finally,an experimental platform was set up and machining experiments were conducted. The results indicate that the turbulent dispersion method can revive the characteristic of turbulence velocity fluctuation. The simulation results of abrasive movement accord with that in the experiment to some extent. The abrasive flow has a good machining effect on the surface of titanium alloy artificial joint.
作者
张利
陈俊超
陈国达
傅昱斐
ZHANG Li;CHEN Jun-chao;CHEN Guo-da;FU Yu-fei(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310032,China)
出处
《机电工程》
CAS
北大核心
2018年第12期1266-1272,共7页
Journal of Mechanical & Electrical Engineering
基金
国家自然科学基金资助项目(51575493)
浙江省自然科学基金资助项目(LY15E050020)
关键词
磨粒流
加工流场
湍流分散
数值模拟
abrasive flow
machining flow field
turbulent dispersion
numerical simulation
