基于Comsol的磁场辅助磨料水射流流场分布数值模拟

Numerical Simulation of Flow Field Distribution of Abrasive Water Jet Based on Comsol Software

借助Comsol软件数值模拟螺线管线圈的磁场强度分布和聚焦管内流场的分布状态,分析螺线管线圈磁场强度的分布规律及辅助磁场对磨料水射流的作用机理,获得使磨料水射流达到最佳聚焦效果的磁场强度。结果表明当励磁电流I=2.2A时,磨料射流束在喷嘴出口处获得最佳聚焦效果。观察比较施加磁场辅助前后喷嘴外部流场的分布状态,并利用振动及动态信号采集分析系统测量射流实际冲击力。测量试验表明,施加磁场辅助后,磨料水射流的有效直径变小,聚焦效果显著增强,原有的薄水雾层消失,射流冲击力随电流强度的增大而增大。

With the help of Comsol software,the distribution of magnetic field intensity and flow field inside and outside the focusing tube was simulated.The distribution law of magnetic field intensity was analyzed as well as the mechanism of magnetic field acting on water jet,and the optimum magnetic field intensity was obtained to achieve the best focusing effect of water jet.The results indicate that the best focusing effect of water jet was obtained with the current of 2.2A.The difference of flow field outside the nozzle was observed and analyzed before and after the magnetic field was applied,the vibration and dynamic signal acquire analysis system(CRAS)was used to measure the actual impact force of water jet.The experiment results show that with the magnetic field applied,the effective diameter of abrasive water jet decreases,the focusing effect increases obviously,the original water mist disappears,and the impact force of abrasive water jet increases with the increase of current intensity.