Turbulent dispersion based flow field analysis and experiment of abrasive flow machining
                                                        ZHANG Li, CHEN Junchao, CHEN Guoda, FU Yufei
                            (College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310032, China)

Abstract: 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 NS 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.

Key words: abrasive flow; machining flow field; turbulent dispersion; numerical simulation