真实比热模型中铝粉尘两相爆轰波的数值研究  

Realistic Heat Capacity Effects in Two Phase Aluminum Dust Detonations

作　　者：滕宏辉[1] 杨旸[1] 姜宗林[1] 

机构地区：[1]中国科学院力学研究所高温气体动力学国家重点实验室,北京100190

出　　处：《计算物理》2013年第1期44-52,共9页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(90916028)资助项目

摘　　要：采用多流体模型对铝粉尘两相爆轰波进行数值模拟,研究颗粒能量计算方法对起爆和传播过程的影响.以前的固相颗粒能量的计算一般采用固定比热方法,本文采用随温度变化的真实比热.由于铝颗粒及其产物氧化铝的比热变化很大,模拟得到的爆轰波的速度、压力和波后参数变化和采用固定比热存在较大的差异.变比热计算得到的爆轰波压力、传播速度和实验结果更加接近,而固定比热的计算方法会对这些参数造成高估.对爆轰波的形成进行研究,发现起爆距离主要受起爆能量影响,但是相对于固定比热模型,采用变比热模型得到的起爆距离较短.Two phase detonations of aluminum dust are simulated in a multi-fluid model to study particle energy calculation methods. In previous studies heat capacities of solid particles are constants, while realistic heat capacities change with temperature. In this simulation, effects of realistic heat capacities are studied. Numerical results show that detonation parameters are influenced significantly. The results with realistic capacities are close to experiments, while the results with fixed capacities overestimate pressure and detonation velocity. In detonation initiation, run-up distance is mainly decide by ignition energy, while realistic effect makes the distance shorter than that in the fixed heat capacity case.

关 键 词：气固两相 爆轰波 铝粉尘 比热 

分 类 号：O381[理学—流体力学]