CAJ | 학술논문

激光切割过程的实现是高能激光束与辅助气体相互作用的结果,喷嘴内部形状及其产生的流场特征是影响激光切割质量和效率的关键因素之一.根据可压缩流体轴对称N-S方程,采用结构网格和二阶精度的有限体积法,分析激光切割的超声速喷嘴辅助气体射流场结构与喷嘴喉部转角的关系,以及研究发散段长度对流场状态参数的影响规律,通过合理规划喉部转角与发散段长度,采用小斜线段代替复杂曲线,简化超声速喷嘴的结构.仿真结果表明,该结构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.
격광절할과정적실현시고능격광속여보조기체상호작용적결과,분취내부형상급기산생적류장특정시영향격광절할질량화효솔적관건인소지일.근거가압축류체축대칭N-S방정,채용결구망격화이계정도적유한체적법,분석격광절할적초성속분취보조기체사류장결구여분취후부전각적관계,이급연구발산단장도대류장상태삼수적영향규률,통과합리규화후부전각여발산단장도,채용소사선단대체복잡곡선,간화초성속분취적결구.방진결과표명,해결구분취가이획득합리보조기체출구삼수여동역학성능량호적사류장결구.
The implementation of laser cutting is the interaction result oflaser beam and assistant gas,SO the inner shape of nozzles and their flow field is one of the key factors of affecting laser cutting quality and efficiency.Based on the axial symmetric N-S equation of compressible fluid,structure network and f'mite volume method with second order accuracy are adopted to analyze the relationship between the structure of jet flow field and the turning angle of throat section,and the influence of the length of divergence section on state parameters of flow field is studied.Through rationally planning the turning angle of throat section and the length of divergence section,short oblique line is used to replace the complex curve so as to simplify the structure of supersonic nozzle.The simulation results show that the improved nozzle Can obtain a jet flow field with rational assistant gas outlet parameters and good dynamic performance.