中文摘要：

采用ANSYS Fluent对磨粒流场进行瞬态CFD仿真,得到射流过程中磨粒的分布和速度;并研究射流加工区磨粒运动机制,研究表明,新型后混合式磨料水射流加工中磨粒很容易穿过射流加工的静压区直接与工件发生作用进而去除材料。建立磨粒冲击塑性材料的冲击变形磨损模型,并结合Finnie塑性剪切磨损去除模型建立磨料水射流加工去除模型,模型表明,射流加工中心区域的材料去除量最高。根据新型后混合式磨料水射流系统进行塑性材料的磨料水射流加工试验,结果表明,射流加工中心区域材料去除最高,这是由于射流加工中心区域磨粒冲击角度较大、磨粒速度较高,材料以冲击变形磨损去除为主;远离射流冲击中心区域材料去除较低,材料以剪切磨损去除为主,与磨料水射流加工去除模型是完全一致的,证实磨料水射流加工去除模型的正确性。

英文摘要：

The flow field of abrasive is transiently simulated with ANSYS Fluent, obtaining distribution and velocity of abrasive in the abrasive waterjet machining（AWJ）. The movement mechanism of abrasive is studied in the area of jet machining. It also suggests that abrasive easily threads zone of static pressure and directly impacts workpiece in new entrainment abrasive waterjet machining. The impact deformation wear model of AWJ is established. The removal model of AWJ is established with impact deformation wear model and Finnie plastic shear model. This removal model suggests that the material removal is high in the central region of the workpiece. The experiments of AWJ are carried according to new entrainment abrasive waterjet system. The results have shown that the material removal is high in the central region of the workpiece. This is because that impact angle of abrasive is bigger and speed of abrasive is higher in the jet machining center areas, materials are mainly removed by impact deformation wear. The material removal is low away from the centre areas of jet machining, materials are mainly removed by plastic shear wear. The experimental result of AWJ is fully consistent with theoretical removal model of AWJ, confirming that removal model of AWJ is right.