【作者】 彭亚晶； 杨延强；

【Author】 Peng Ya-jing;Yang Yan-qiang;Department of Physics,School of Mathematics and Physics,Bohai University;Department of Physics,Harbin Institute of Technology;

【机构】 渤海大学数理学院物理系； 哈尔滨工业大学物理系；

【摘要】 为了澄清纳米金属复合含能材料的激光预烧蚀机制,发展了一个"热点"模型,对纳秒脉冲激光作用下,含能材料中纳米Al粒子引发的热反应动力学过程进行了数值模拟。该"热点"模型包括了纳米金属粒子对脉冲激光的热响应(热点形成),热量传播及其引发周围含能介质放热的化学反应(热点演化)过程。模型中详细地分析了化学反应的时间、空间和温度特性,并考虑了反应后物质的改变。计算结果与实验结果对比分析,表明热分解机制主导着纳秒脉冲激光预烧蚀过程。更多还原

【Abstract】 In order to clarify the pre-ablation mechanism of nanometallic composite energetic materials induced by laser,a "hotspot" model is developed to simulate the thermal reaction kinetics caused by Al nanoparticles dispersed in the energetic materials excited by nanosecond pulse laser,The "hot" model includes the thermal response of Al nanoparticle to pulse laser(formation of "hotspot"),heat transmission and exothermal chemical reaction of surround energetic medium induced by heat transfer(evolution of "hotspot").Model analyses in detail the properties of time,space,temperature,and the change of substance after chemical reaction are all considered in the model in detail.Calculation results are comparative with the experimental results,which show that the thermal decomposition mechanism dominates the pre-ablation process excited by nanosecond pulse laser.更多还原