会聚型喷嘴内部形状参数对射流流场的影响  

Effect about Assemble Nozzle's Internal Figure Parameters to Jet Field

作　　者：邱明勇[1] 胡俊[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5期1296-1301,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：会聚型喷嘴是目前激光切割应用最为广泛的亚音速喷嘴,所产生的流场结构对激光切割质量和效率影响显著。建立了会聚型喷嘴的湍流模型,根据可压缩流休轴对称N-S方程,采用结构网格和二阶精度的有限体积法,对不同内部形状参数的会聚型喷嘴自由射流进行了数值模拟。揭示锥型喷嘴收缩段收缩角、收敛型喷嘴收敛段抛物线曲率半径对射流的流场结构参数的影响规律,为激光切割喷嘴的优化选择和设计提供有效依据。Assemble nozzles are most widely used in the laser cutting presently, and their resulted jet structure influences laser cutting quality and efficiency remarkably. Based on the axial symmetric N-S equation of compressible liquid, we establish the onflow model to simulate convergent nozzles＇ free jet with different internal parameters by using structural grid and finite volume of quadratic precision. The law of the influence of contractive angle of taper nozzles and curvature radius of convergence nozzles＇ convergent section on jet structure parameters is revealed, and it can provide a basis for optimization selection and design about laser cutting nozzles.

关 键 词：激光技术 激光切割 会聚型喷嘴 流场结构 流体动力学 

分 类 号：TG485[金属学及工艺—焊接]