激光切割中的简易超音速喷嘴辅助气体流场分析与结构优化  

Analysis of Assist Gas Glow and the Structural Optimizing for Simple Supersonic Nozzle in Laser Fusion Cutting

作　　者：郭绍刚[1] 胡俊[1] 罗磊[1] 徐正松[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,上海200240

出　　处：《应用激光》2007年第5期403-407,共5页Applied Laser

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)

摘　　要：分析了激光切割的简易折线结构超音速喷嘴辅助气体射流场结构与喷嘴喉部转角的关系,以及发散段长度对流场状态参数的影响规律,通过合理规划发散段直线的长度,使简易折线结构的超音速喷嘴能够获得均匀的流场结构与最佳的动力学特性。最后仿真结果验证优化后的喷嘴可以获得合理辅助气体出口参数与动力学性能良好的射流场结构。A relationship between the structure of jet flow and the turning angle throat section is analyzed, and the influence of the length of divergence section on state parameters of jet flow is studied for simple curved supersonic nozzle. The length of divergence section are designed reasonably to improve this supersonic nozzle. The uniform flow and the optimum dynamic characteristic can be obtained by using the improved supersonic nozzle. The numerical results show that the improved nozzle can obtain the jet flow with reasonable outlet parameters and good dynamic characteristic finally.

关 键 词：超音速喷嘴 喉部 射流场 动力学特性 

分 类 号：TP242[自动化与计算机技术—检测技术与自动化装置]