激光辐照碳纤维温度均匀性仿真分析
Simulation analysis of temperature uniformity in laser-irradiated carbon fibers
万凯 1谭晶 2丁奇胜 1罗丽华 1吴雪松 1杨卫民2
作者信息
- 1. 北京化工大学 机电工程学院,北京 100029
- 2. 北京化工大学 机电工程学院,北京 100029;北京化工大学 有机无机复合材料国家重点实验室,北京 100029
- 折叠
摘要
为解决激光辐照碳纤维温度不均匀引起的石墨化不均匀、模量差别大的问题,利用COMSOL软件建立了高斯与平顶激光辐照碳纤维热传导-热对流-热辐射的仿真模型,对比分析了高斯光强和平顶光强激光辐照碳纤维的升温特性以及温度分布,研究了不同激光辐照下,碳纤维的表面、截面温度分布以及达到烧蚀温度后碳纤维的烧蚀情况.实验结果表明:平顶激光辐照碳纤维的表面、截面温度分布较高斯激光更均匀,整体温差更小;不同激光辐照碳纤维的烧蚀深度呈线性变化,并且平顶激光辐照碳纤维的烧蚀速率更小.因此,平顶激光相较于高斯激光可控性更高,辐照碳纤维的温差更小,使其石墨化程度更均匀.
Abstract
Simulation models of heat conduction-heat convection-thermal radiation during Gaussian and top-hat laser irradiation of carbon fibers have been established to study the temperature distribution of carbon fibers under laser irradiation by means of COMSOL.This paper compares the heating characteristics and temperature distribution of carbon fibers irradiated by Gaussian and top-hat laser irradiation.After reaching the ablation temperature,the carbon fiber was ablated by the laser beam,and the surface and cross-section temperature distributions were investi-gated.The results show that the temperature distribution of the surface and cross-section of the carbon fiber irradia-ted by the top-hat laser is more uniform than that when using the Gaussian laser,and the overall temperature differ-ence is smaller.The ablation depth of carbon fibers irradiated by different lasers varies linearly,and the ablation rate of carbon fibers irradiated by top-hat laser irradiation is smaller.Therefore,the top-hat laser is more controlla-ble than the Gaussian laser,and the temperature difference in the irradiated carbon fibers is smaller,which makes its graphitization degree more uniform.
关键词
碳纤维/石墨化/传热/相变/数值模拟Key words
carbon fibers/graphitization/heat transfer/phase transition/simulation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据