气流与激光联合作用铝合金板热响应研究  

Study on thermal response of aluminum alloy plate subjected to airflow and laser irradiation

作　　者：陶彦辉[1] 张家雷[1] 张旭平[1] TAO Yanhui;ZHANG Jialei;ZHANG Xuping(Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621000,China)

机构地区：[1]中国工程物理研究院流体物理研究所,绵阳621000

出　　处：《激光技术》2024年第4期603-607,共5页Laser Technology

基　　金：国家自然科学基金资助项目(12002327;12272364)。

摘　　要：为了获得激光加工等应用中气流环境激光辐照材料的热响应特性和熔穿规律,采用面热源近似和不定常热传导分析方法构建了包括热传导、对流换热、熔化烧蚀等主要机制的物理模型,并通过实验校核后进行了气流环境激光辐照铝合金热学响应定量评估,获得气流环境不同激光功率密度下铝合金靶板温升和烧蚀熔穿规律。结果表明,相同靶参数下,熔穿时间随着激光功率密度增加而急剧减小,并且熔穿时间变化规律与热平衡积分方法气化烧蚀模型结果一致;不同条件下熔穿时间显示,在激光功率密度较小(500 W/cm^(2)附近)时,气流引起对流换热因素对激光烧蚀熔穿影响较大,而在激光功率密度较高(1500 W/cm^(2)以上)时,气流引起对流换热因素对激光烧蚀熔穿影响较小。建立的气流条件下激光辐照热响应模型与实际物理过程更接近,计算获得的熔穿规律为激光辐照模型合理简化提供了定量的参考依据。In order to obtain the thermal response and melting through characteristics of materials irradiated by high energy laser with airflow environment in field of laser processing and other applications,a physical model considering the mechanisms of heat conduction,convective heat transfer,melting and ablation was constructed by using the approximation of plane heat source and unsteady method.The model was validated by experiments and was used for evaluating quantitatively the thermal responses of material.Then,the temperature rise and penetration law of aluminum alloy plates subjected to different laser power density in airflow were obtained.The results indicate that the melting through time decreases sharply with the increase of laser power density under the same target parameters.And the calculated melting through time is consistent with the results by using the gasification ablation model of thermal balance integration method in the literature.The analysis of perforation time under different conditions shows that the airflow factor has a significant influence on laser ablation melting through when the laser power density is small(approximately around 500 W/cm^(2)).When the laser power density is large(above 1500 W/cm^(2)),the effect of airflow through convective heat transfer is insignificant.In addition,the physical model considered in calculation is close to the actual physical process.Above calculation results and analytical understanding provide a quantitative basis for simplifying reasonably the laser ablation models.

关 键 词：激光技术 激光辐照 气流环境 热响应 激光烧蚀 

分 类 号：TN249[电子电信—物理电子学] V261.8[航空宇航科学与技术—航空宇航制造工程]