前混合式磨料水射流喷嘴外流场仿真与实验

通过建立磨料水射流喷嘴有限元模型，对2种不同直径的前混合式磨料水射流的喷嘴外流场进行仿真分析.结果表明,在喷嘴其它几何条件相同的情况下，出口直径对喷嘴的出口速度影响比较大，出口直径越大，出口速度越小；在一定程度上将混合管适当地加长，可以提高磨料射流在喷嘴出口处的速度；磨料水射流最佳的切割距离为喷嘴出口直径的2.0～5.0倍.磨料水射流切割靶体实验结果与靶体冲击仿真结果基本吻合.

Flow field simulation and experiment of pre-mixed abrasive water jets outside the nozzle

Based on the finite element model of the pre mixed abrasive water jet(AWJ) nozzle, numerical simulation of flow field outside AWJ nozzle with two different diameters was studied. The results indicate that exit diameter influences the nozzle velocity relatively larger, and the nozzle velocity decreases with increasing diameter while keeping other geometry construction parameters changeless. It would increase the AWJ velocity at nozzle exit by increasing the length of nozzle mixing tube properly. The optimal cutting distance of the AWJ is 2.0~5.0 times the nozzle exit diameter. The AWJ experimental cutting target results accord with the impacting simulation device on the whole.