甲醇/甲烷层流扩散火焰碳烟生成的模拟研究  

Simulation of soot generation in methanol/methane laminar diffusion flame

作　　者：张逸 鞠洪玲[1,2] ZHANG Yi;JU Hongling(Hubei Key Laboratory of Modern Auto Parts Technology(Wuhan University of Technology),Wuhan 430070,China;Hubei Collaborative Innovation Center of Auto Parts Technology,Wuhan 430070,China)

机构地区：[1]现代汽车零部件技术湖北省重点实验室(武汉理工大学),湖北武汉430070 [2]汽车零部件技术湖北省协同创新中心,湖北武汉430070

出　　处：《中南大学学报（自然科学版）》2024年第9期3556-3565,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51706163)。

摘　　要：为充分了解甲醇对碳烟生成的影响,构建甲醇/甲烷混合燃烧机理,耦合Moss-Brookes碳烟模型,建立甲醇/甲烷层流火焰燃烧模型,在保证碳流量一定的情况下,研究甲醇掺混比(质量分数)分别为0、10%、20%、30%、40%这5种掺混比的甲醇/甲烷层流扩散火焰的碳烟生成特性。研究结果表明:甲醇的添加会导致火焰的起燃位置降低,从而导致碳烟在火焰更低的位置生成。火焰中碳烟体积分数随甲醇掺混比的增加先增加后减小,在30%甲醇掺混比下火焰的碳烟体积分数峰值达到最大值,碳烟体积分数为4.12×10^(-8)。甲醇掺混比升高会使O和OH的峰值升高,但在30%甲醇掺混时,峰值会在轴向位置发生向上偏移,导致30%甲醇掺混时碳烟体积分数为最大值。In order to fully understand the influence of methanol on soot generation,the mixed combustion mechanism of methanol/methane was established,coupled with Moss-Brookes soot model,and the laminar flame combustion model of methanol/methane was also established.Under the condition of ensuring a certain carbon flow,the soot formation characteristics of methanol/methane laminar diffusion flame with methanol mixing ratios(mass fraction)of 0,10%,20%,30%and 40%were studied.The results show that the addition of methanol will reduce the ignition position of the flame,resulting in the formation of soot in the lower position of the flame.With the increase of methanol blending ratio, the soot volume fraction in the flame first increases and then decreases. At 30% methanol blending ratio, the peak value of soot volume fraction reaches the maximum value, and the soot volume fraction is 4.12×10^(−8). The peaks of O and OH increase with the increase of methanol mixing ratio, but the peaks shift upward in the axial position when 30% methanol is mixed, resulting in the maximum soot volume fraction when 30% methanol is mixed.

关 键 词：碳烟 甲醇/甲烷 层流扩散火焰 化学反应机理 模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]