磨料水射流喷嘴内流场数值模拟

在前混合磨料水射流（AWJ）中添加聚丙烯酰胺溶液后，可进一步提高多相流动力学特性，从而提高AWJ排除爆炸物作业效率、减少喷嘴磨损，对于利用该技术进行爆炸物切割、钻孔等作业具有重要意义。基于Cross方程对磨料浆体射流（ASJ）喷嘴内多相流进行数值模拟，经实验数据对比可知该方法可以相对准确描述ASJ的动力学特性。利用数值模拟结果对多相流的动力学特性进行分析，通过与AWJ对比得出ASJ可减少喷嘴内阻力，提高射流速度和射流集束性，降低核心区内多相流湍流强度，使磨料颗粒分布更加均匀的作用。

Numerical Simulation of Flow Field in Abrasive Water Jet Nozzles

The dynamics characteristics of multiphase flow are further improved by adding polyacrylamide into the pre-mixed abrasive water jet (AWJ), thereby improving the operation efficiency and reducing the nozzle wear, which is very important for cutting, drilling and other operations using this technology. Multiphase flow in abrasive suspension jet (ASJ) nozzle is simulated based on Cross equation. The results show that the method can accurately describe the dynamics characteristics of ASJ compared with experimental data. The dynamics characteristics of multiphase flow are analyzed by simulation approach. The results indicate that ASJ can reduce the drag force, raise the velocity of jet and improve the jet concentration compared with AWJ. It can also reduce the turbulent intensity of multiphase flow in the core area and make the abrasive particles distribute more uniformly.