华中科技大学学报（自然科学版）2025，Vol.53Issue(7)：59-65,73,8.DOI:10.13245/j.hust.250672
低压对甲烷火焰中炭黑生成及辐射特性的影响
Influence of sub-atmospheric pressure on soot formation and radiative properties in methane flame
摘要
Abstract
Based on the kinetic modeling of soot formation,the combustion process of methane counterflow diffusion flame has been simulated and the influence of low pressure on formation characteristics of soot has been revealed in this paper.Meanwhile,the change of soot emissivity under different volume fractions,temperatures,and path lengths have been analyzed based on the Mie theory,revealing the impact of soot volume fraction on the radiative heat transfer.The results show that the decrease in pressure would lead to a reduction in the flame temperature,the mole fraction of soot precursors,and the soot volume fraction,which inhibits the formation of soot precursors and then suppresses soot generation.When the pressure drops from 100 kPa to 60 kPa,with the mass flow rate is controlled,the peak soot volume fraction decreases from 1.516 9×10-7 to 2.414 8×10-11,a reduction of four orders of magnitude.While the peak reduces sharply from 1.516 9×10-7 to 3.662 1×10-14,a drop of seven orders of magnitude when controlling the velocity.The soot volume fraction is an important factor in determining soot emissivity.When the path length is 1～10 m and the volume fraction reaches 1.0×10-5,the emissivity rapidly converges to 1 as the path length increases,with the dominance of soot radiation.Conversely,when the volume fraction is lower than 1.0×10-7,the emissivity is close to 0 which indicates the soot radiation could be ignored.关键词
低气压/甲烷火焰/炭黑/生成特性/辐射特性Key words
sub-atmospheric pressure/methane flame/soot/formation characteristics/radiative properties分类
能源与动力引用本文复制引用
邓磊,王津,笪耀东,黄笑乐..低压对甲烷火焰中炭黑生成及辐射特性的影响[J].华中科技大学学报（自然科学版）,2025,53(7):59-65,73,8.基金项目
国家重点研发计划资助项目(2021YFF0600601). （2021YFF0600601）
