基于两相流模型数值研究可燃颗粒燃烧爆轰的特性

粉尘爆炸是工业爆炸灾害的重要形式。建立可燃颗粒非均相系统的燃烧爆轰模型,基于Eulerian-Eulerian数值描述方法,采取有限差分方法编制非均相系统燃烧和爆轰发展的数值模拟程序,对封闭空间内两相非定常爆轰过程进行研究。数值分析可燃颗粒尺度、颗粒浓度对非均相系统燃烧、爆轰特性的影响。结果表明:在一定的范围内,当可燃颗粒的体积分数为10%,粒径0.5mm时,流场的燃烧爆轰效应最强。即10.6ms时刻,流场压力值达到28MPa,温度高达2600K,颗粒燃烧效率最高。

Numerical study of combustion and detonation characterisitcs for bombustible particles based on two-phase flow model

Dust explosion is an important form of industrial explosion disasters. A combustion and detonation model of heterogeneous system for combustible particle was established,and Eulerian-Eulerian numerical method was a-dopted. Fortran program was developed by the finite difference method,and the development processes of combus-tion and detonation in the closed field were simulated numerically for heterogeneous system. Effects of fuel particle concentration,scale of particle on detonation properties were analyzed. The results showed that for the volume frac-tion 10% of combustible particle and 0. 5mm of particle diameter,the combustion detonation properties of flow field are optimum within the discussion scope of this paper. At 10. 6ms,the pressure can reach 28MPa,and the temper-ature can reach 2600K,so the combustion efficiency of particle is the highest.