RDX激光点火的一维气相模型

One-Dimensional Gas-Phase Reaction Model of Laser-Induced Ignition of RDX

为了研究含能材料RDX在激光作用下的点火特性,在Liau等人的工作基础上,考虑了物理参数随温度和组分浓度的变化,建立了RDX激光点火的气相模型。利用有限差分方法,计算了激光功率密度为400 W/cm2、环境压力为0.1 MPa时RDX的点火过程。结果表明:约90%的RDX以蒸发的形式进入气相,另外的10%在液相中发生分解;气相中随着反应物的增加和温度的升高,反应逐渐加剧,最终达到点火。计算得到的点火延迟时间为10 ms,与已报道的研究结果基本一致。

Based on the work of Liau et al.,a one-dimensional gas-phase reaction model of laser-induced ignition of RDX was established by considering the variations of physical parameters with temperature and component concentration.Using this gas-phase reaction model and finite difference method,the ignition characteristics of RDX ignited by laser radiation of 400 W/cm2 power density at 0.1 MPa and 300 K were investigated.The calculated results showed that about 90% RDX transform to gas phase by evaporation and the remaining 10% decompose in condensed phase.With the accumulation of reactant and increase of temperature,the reaction rate increases gradually and finally the gas phase is ignited at about 10 ms,which is consistent with the results reported in previous literatures.