两种激光切割超音速喷嘴结构设计与辅助气体流场分析  

Structural Design and Assist Gas Flow Analysis of Two-Laser Cutting Supersonic Nozzles

作　　者：胡俊[1] 邱明勇[1] 姚振强[1] 

机构地区：[1]上海交通大学机械与动力工程学院机械系统与振动国家重点实验室,上海200240

出　　处：《中国激光》2009年第4期1005-1010,共6页Chinese Journal of Lasers

基　　金：上海市科学技术发展基金光科技重大专项(05DZ22003);上海市科学技术发展基金登山计划(06DZ11418)资助课题

摘　　要：对简易折线缩放喷嘴和基于霍耳(Hall)设计方法的复杂喷嘴外流场中压力分布,以及马赫盘位置变化等特性进行了分析。详细比较了这两种喷嘴气流场动力学性能之间的差别,揭示了两种喷嘴动力学性能的差别随工作压力增加越来越小的趋势。分析表明在高压状况下为减少激光切割的成本,用简易折线结构超音速喷嘴替代复杂流线结构喷嘴是可行的。The characteristics of the pressure distribution and Mach disk position are analyzed for simple nozzle and complicated nozzle based on Hall design method, and the difference of dynamic characteristic of gas flow is compared particularly. The trend is revealed that the difference of dynamic characteristic between the two nozzles becomes smaller with the increase of working pressure. It is demonstrated that using the simple structure nozzle to replace the complicated flow line structure nozzle is feasible for decreasing the cost of laser cutting under the high pressure condition.

关 键 词：激光技术 激光切割 超音速喷嘴 流场分析 流体动力学 

分 类 号：TG485[金属学及工艺—焊接]