超高压后混合磨料水射流喷嘴优化数值模拟研究

Numerical simulation study on optimization of ultra-high pressure post mixed abrasive water jet nozzle

为了提升磨料水射流系统切割坚硬厚顶板的效率,利用数值模拟软件研究了喷嘴结构参数对磨料颗粒的速度及其分布的影响规律。结果表明:随着水喷嘴直径的增加,磨料的出口速度增大,在出口截面上,磨料颗粒主要集中在水射流外边界区域;当磨料入口角度和位置分别为60°和3 mm时,磨料颗粒的速度最大,轴线区域集中度最好。基于以上规律,对影响因素进行正交实验及方差分析,得出最优参数为水喷嘴直径1 mm,磨料入口位置为0 mm,角度为60°。通过割缝实验对比,发现喷嘴优化后割缝宽度减小了12.0%,深度增大了26.5%。

In order to improve the efficiency of abrasive water jet system for cutting hard and thick roof,the influence of nozzle structure parameters on the velocity and distribution of abrasive particles was studied by using numerical simulation software.The results show that the outlet velocity of abrasive increases with the increase of water nozzle diameter,and the abrasive particles are mainly concentrated in the outer boundary area of water jet on the exit section;when the inlet angle and position of the abrasive are 60°and 3 mm,respectively,the velocity of the abrasive particles is the maximum,and the axial regional concentration is the best.Based on the above rules,orthogonal experiment and variance analysis are carried out on the influencing factors,and the optimal parameters are obtained as the diameter of water nozzle is 1 mm,the position of abrasive inlet is 0 mm,and the angle is 60°.Through the slit experiment comparison,it is found that the slit width is decreased by 12.0%and the depth is increased by 26.5%after nozzle optimization.