摘要
为了探究障碍物对CO_(2)抑制甲烷爆炸效果的影响,利用FLACS数值模拟软件,系统研究半密闭管道内CO_(2)与障碍物共存时的甲烷燃爆特性。通过构建多工况组合,结合爆炸压力峰值、火焰传播速度及流场的演变过程,分析半密闭管道内不同浓度CO_(2)抑制甲烷爆炸过程受障碍物影响的特征规律,确定能使障碍物失去促进作用的CO_(2)体积分数。结果表明:障碍物显著削弱CO_(2)对爆炸压力及火焰传播的抑制效果,当CO_(2)体积分数达20%时,其促进作用基本消失;爆炸压力初峰时间随CO_(2)浓度增加而延后,但障碍物工况较空管仍有提前,最大压力峰值出现时间延后;平均火焰速度在70%阻塞率时达峰值,90%时因湍流淬熄下降;随CO_(2)浓度增加,火焰未燃区空腔面积增加,抑制火焰加速。研究为复杂管道甲烷燃爆防控提供理论支撑。
To investigate the impact of obstacles on the suppression of methane explosions by carbon dioxide,FLACS numerical simulation software was employed to systematically analyze the combustion and explosion characteristics of methane in semi-confined pipelines coexisting with CO_(2) and obstacles.By constructing multiple working condition combinations,the suppression patterns of obstacle-affected methane explosions under varying CO_(2) concentrations were examined through peak explosion pressure,flame propagation velocity,and flow field evolution.The critical CO_(2) volume fraction required to eliminate the promotional effect of obstacles was identified.Results reveal that obstacles profoundly weaken CO_(2)’s suppression effects on explosion pressure and flame propagation;this promoting effect is basically eliminated at a CO_(2) volume fraction of 20%.The initial peak time of explosion pressure is delayed as CO_(2) 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 increase of CO_(2) concentration,the cavity area in unburned zones,expands,effectively inhibiting flame acceleration.This study provides valuable theoretical insights for the prevention and control of methane explosions in complex pipeline systems.
作者
程方明
刘宇航
杨漪
罗振敏
CHENG Fangming;LIU Yuhang;YANG Yi;LUO Zhenmin(College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Shaanxi Engineering Research Center for Industrial Process Safety and Emergency Rescue,Xi’an University of Science and Technology,Xi’an 710054,China;Xi’an City Public Safety and Fire Rescue Key Laboratory,Xi’an University of Science and Technology,Xi’an 710054,China;College of Safety Science and Engineering,Nanjing Tech University,Nanjing 211816,China)
出处
《西安科技大学学报》
北大核心
2025年第3期471-480,共10页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金项目(52304252)
中国博士后基金项目(2024M752605)
陕西省自然科学基金项目(2025JC-YBQN-465)。
关键词
爆炸防控
障碍物
FLACS
二氧化碳浓度
爆炸特性
explosion control and prevention
obstacles
FLACS
carbon dioxide concentration
explosion characteristics
