关键词: 磨粒流加工；固液两相流；压力特性；数值模拟

Abstract:

By the CFD(computational fluid dynamics) software FLUENT, the abrasive flow shape during abrasive flow machining(AFM) was simulated by the Spalart-Allmaras model which
is a Mixture turbulent flow model for solid-fluid two phase flow system.The simulation results show that the increase of pressure difference between exit and entrance of the abrasive cavity will improve the fluid speed, and increase the speed difference between the boundary layer and the wall. It will improve the AFM efficiency.Compared with the steady flow field,in the unsteady flow field which is caused by changing the entrance pressure,the AFM efficiency is higher because the abrasive distribution near to the wall is larger.In addition,the results also show that the viscosity of the abrasive media has a great influent on abrasive flow machining.The results can offer a valuable reference for parameter selection during abrasive flow machining.

Key words: abrasive flow machining(AFM);solid-fluid flow, pressure characteristics;numerical simulation