湍流射流C_3H_8/H_2/air扩散火焰中的局部熄火和再燃现象  

Local extinction and reignition in nonpremixed turbulent jet C_3H_8/H_2/air diffusion flames

作　　者：卓丽颖[1] 蒋勇[1] 徐武[1] 许立[1] 

机构地区：[1]中国科学技术大学火灾科学国家重点实验室,合肥230026

出　　处：《火灾科学》2014年第2期85-91,共7页Fire Safety Science

基　　金：国家自然科学基金(51176181);国家重点基础研究发展计划(2012CB719704)项目资助

摘　　要：C3H8是液化石油气的主要成分之一,对其湍流燃烧特性的研究对火灾消防等行业具有十分重要的意义。建立了一维湍流模型(ODT)的大规模计算平台并研究在固定雷诺数Re=9800的情况下,丙烷非预混湍流射流火焰中的局部熄火和再燃现象。丙烷火焰的模拟结果显示局部熄火现象主要发生在近场区域。火焰主要自由基OH、O及主要燃烧产物在局部熄火区域都迅速减少,随着之后再燃的发生,这些组分也开始逐渐增多。但是从这些组分增加的量可以看出,丙烷火焰的再燃过程相对比较慢并且没有达到完全再燃。The turbulence combustion characteristics of C3H8 is very important for fire engineering because C3H8 is one of the main components of liquefied petroleum gas. In this paper, one-dimensional turbulence （ODT） model and parallel computing are used to study the propane nonpremixed flame extinction and reignition phenomenon in the case of a fixed Reynolds Number of 9800. The numerical simulation results show that flame extinction occurs mainly in the near field. The major radicals of OH/O in flame and the main combustion products rapidly decrease in the region of extinction. In the subsequent reignition process, these species increase gradually, however it is concluded that the propane flame does not fully reburn.

关 键 词：一维湍流 丙烷-氢气 局部熄火与再燃 扩散火焰 

分 类 号：X931[环境科学与工程—安全科学] X932