氢气/氮气添加对乙烯扩散火焰碳烟生成影响的模拟研究

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关键词：氢气/氮气；乙烯；同轴协流扩散火焰；碳烟；化学促进作用中图分类号：TK4O文献标志码：ADOI：10.7652/xjtuxb202510013 文章编号：0253-987X（2025）10-0137-11

Simulation Study on the Effect of Hydrogen/Nitrogen Addition on Soot Formation in Ethylene Diffusion Flames

YAN Zhiyu 1，2 ，SHI Congling²，XIONG Xinyi1，LEI Bohan ⋅1 ， LI Qianqian¹，WANG Jinhua1，HUANG Zuohua1 .State Key Laboratoryof Multiphase Flowin Power Enginering，Xi'an Jiaotong University，Xi'an710049，China; 2.Urban Security Institute， China Academy of Safety Science and Technology，Beijing l0ool2，China）

Abstract： To address the question of whether hydrogen addition chemically promotes or inhibits soot formation，a two-dimensional numerical simulation is conducted to systematically investigate pure ethylene，nitrogen-added，and hydrogen-doped co-flow diffusion flames. The effects of adding 30% （204号 hydrogen/nitrogen by volume on flame temperature， soot volume fraction， particle growth， nucleation， precursor evolution，and oxidation processes are analyzed. The variations in key characteristic parameters are obtained，and the mechanism of the chemical promotion effect of low-proportion hydrogen addition on soot formation is elucidated. The simulation results show that compared to nitrogen-diluted flames，the addition of 30% hydrogen slightly promotes soot formation，with the peak soot volume fraction increasing from 4.37×10-6 to 4.52×10-6 ，while the influence of hydrogen-induced temperature field changes on soot formation is minor. The chemical promotion effect of hydrogen addition is primarily achieved by accelerating the formation of polycyclic aromatic hydrocarbons （PAHs） and particle nucleation rates， thereby enhancing particle mass growth through PAHs deposition rather than dehydrogenation-acetylene reactions. Although hydrogen addition promotes particle oxidation by simultaneously increasing OH and O2 oxidation rates，its chemical promotion of particle growth outweighs the oxidation enhancement. This study provides theoretical insights for controlling soot particles in hydrogen-doped combustion.

Keywords： hydrogen/nitrogen; ethylene;co-flow diffusion flame; soot; chemical promotion

由于碳氢燃料燃烧生成的碳烟颗粒是形成雾霾天气的主要元凶，也是人体产生呼吸道疾病的风险源之一，因此控制碳氢燃料燃烧碳烟的生成具有重要意义[。（剩余15834字）