西安科技大学学报2025，Vol.45Issue(3)：471-480,10.DOI:10.13800/j.cnki.xakjdxxb.2025.0305
障碍物管道中CO2对甲烷爆炸特性影响的模拟研究
Numerical simulation of the effects of CO2 on methane explosion characteristics in pipelines with obstacles
摘要
Abstract
To investigate the impact of obstacles on the suppression of methane explosions by carbon di-oxide,FLACS numerical simulation software was employed to systematically analyze the combustion and explosion characteristics of methane in semi-confined pipelines coexisting with CO2 and obstacles.By constructing multiple working condition combinations,the suppression patterns of obstacle-affected methane explosions under varying CO2 concentrations were examined through peak explosion pressure,flame propagation velocity,and flow field evolution.The critical CO2 volume fraction required to elimi-nate the promotional effect of obstacles was identified.Results reveal that obstacles profoundly weaken CO2's suppression effects on explosion pressure and flame propagation;this promoting effect is basical-ly eliminated at a CO2 volume fraction of 20％.The initial peak time of explosion pressure is delayed as CO2 concentration increases but remains earlier than that in obstacle-free scenarios.The occurrence time of the maximum pressure peak shows progressive postponement.The average flame speed peaks at a blockage ratio of 70％and decreases at 90％due to turbulence-induced quenching.With the in-crease of CO2 concentration,the cavity area in unburned zones,expands,effectively inhibiting flame ac-celeration.This study provides valuable theoretical insights for the prevention and control of methane explosions in complex pipeline systems.关键词
爆炸防控/障碍物/FLACS/二氧化碳浓度/爆炸特性Key words
explosion control and prevention/obstacles/FLACS/carbon dioxide concentration/explo-sion characteristics分类
安全科学引用本文复制引用
程方明,刘宇航,杨漪,罗振敏..障碍物管道中CO2对甲烷爆炸特性影响的模拟研究[J].西安科技大学学报,2025,45(3):471-480,10.基金项目
国家自然科学基金项目(52304252) （52304252）
中国博士后基金项目(2024M752605) （2024M752605）
陕西省自然科学基金项目(2025JC-YBQN-465) （2025JC-YBQN-465）
