【作者】 韩学斌；

【导师】 陈东梁；

【作者基本信息】 北京化工大学 ， 安全技术及工程， 2011， 硕士

【摘要】 随着工业的发展和人们生活水平的提高,可燃气体的应用也越来越广泛。随之而来,由可燃气体造成的火灾爆炸事故也越来越频繁。气体火灾爆炸事故能造成惨重的人身伤亡和财产损失,它已经成为危害人类生产和生活的一类主要事故。因此了解火焰传播过程中火焰结构变化及火焰发展的过程,对抑制火灾爆炸的发展和降低火灾爆炸事故带来的损失具有重要意义。本论文主要采用CFD方法,对管道内甲烷-空气预混气体火焰的传播特性和结构特征进行了研究。本文建立了二维管道物理模型,选用了合适的数学模型,采用有限体积法对方程进行离散,对管道内预混火焰的传播过程进行了数值模拟,分析了传播过程中的火焰结构的变化以及特性参数的变化,研究了Tulip火焰结构形成和发展的主要影响因素。同时,对不同初始条件下,管道内预混火焰的传播过程进行了模拟,分析了甲烷的初始浓度、初始温度、边界条件对火焰传播的影响。更多还原

【Abstract】 With the development of industry and people’s living standards, the application of combustible gas is also more extensive. Combustions and explosions caused by combustible gas become more and more frequent. Gas fire and explosion can cause devastating personal injury and property damage. It has become a major accident which is harmful to human life and production. Therefore, it has great significance to inhibit the development of fire and explosion and reduce the losses caused by fire and explosion that understanding the changes of flame structure and the process of flame development in the flame propagation process of development.Research was made on propagation characteristics and structure features of methane-air premixed gases flame in tubes by CFD method in this paper. A two-dimensional physical model was established, a suitable mathematical model was selected, FVM was adopted to discretize the equations. Moreover, numerical simulation to propagation process of premixed flame in the tubes was made in this paper. Furthermore, changes of flame structure and characteristic parameter in the propagation process were analyzed and main impact factors of formation and development of Tulip flame characteristics were researched. Meantime, in order to analyze the influences of initial concentration of methane, the initial temperature and boundary conditions on flame propagation, numerical simulations to Propagation process of premixed flame in the tubes were performed under different initial conditions were performed.更多还原