ZHOU Di-feng，LIU Dong-yu
（Key Laboratory of E&M，Ministry of Education & Zhejiang Province，Zhejiang University of Technology，Hangzhou 310014，China）
Abstract：Aiming at the uneven finish machining effected by the single inlet abrasive flow peocessing，a double inlet processing wasbrought forward. In order to solve the processing of particles impact the wall cann't be tracked by tradition CFD software，a new methodwhich combined DEM with CFD and through coupling the PFC and CCFD software with DMP particle motion model and standard k - εturbulence model was used. The speed of abrasive was recorded by PFC and the movement of flow was recorded by CCFD. Johnson-Cookmodel in Abaqus was used to analyze the effect of impact velocity on the target mass loss. The numerical results indicate that two flowimpacts make the abrasive's movement more disorder in double inlet processing and the impact between wall and abrasive increasegreatly. The speed of impact between abrasive and wall above 40 m/s is 1 382 times in double inlet processing while in single inletprocessing is 563 times. Processing test results indicate that the surface roughness of work piece is Ra = 0.35 μm in double inletprocessing after 30 hours of processing，while in single inlet the value is Ra = 0.65 μm which improved the processing efficiency greatly.
Key words：computational fluid dynamics（CFD）；discrete element method（DEM）；abrasive flow；double inlet processing；impact；mumerical simulation