摘要
为探究泄压强度与浓度梯度对甲烷/空气预混气体爆炸特性的影响,在方形火焰传播测试管道系统中,针对泄压强度为30、60和90 kPa和具有1%体积分数梯度的预混气体,开展甲烷/空气预混气体爆炸特性的试验研究。结果表明:随着泄压强度的增加,火焰通过观察窗的时间逐渐增加,并且泄压膜破裂后,火焰传播呈现往返振荡现象;浓度梯度的存在,使得管道内测得的温度峰值与压力峰值均显著提高;在泄压强度较低时,泄压膜破裂之后的泄压作用对温度峰值、压力峰值的影响占主导作用;随着泄压强度的增大,浓度梯度对爆炸反应的激励作用对温度峰值、压力峰值的影响占主导作用。
In order to study influence of pressure relief strength and concentration gradient on explosion characteristics of methane/air premixed gas,an experiment in a square flame propagation test pipeline system was carried out for premixed gas whose pressure relief strength was 30,60 and 90 kPa and concentration gradient was 1%.The results show that as pressure relief intensity grows,the time for flame to pass through observation window increases gradually.And flame propagation presents a reciprocating oscillation phenomenon after rupture of pressure relief film.Due to existence of concentration gradient,measured temperature and pressure peak values inside pipes are significantly improved.When pressure relief intensity is low,vent burst pressure effects after film rupture dominates the changes in peak temperature and pressure which,however was dominated by excitation effect of concentration gradient on explosion reaction when pressure relief intensity increases.
作者
陈先锋
智雪珂
刘丽娟
雷松
张洪铭
孙玮康
CHEN Xianfeng;ZHI Xueke;LIU Lijuan;LEI Song;ZHANG Hongming;SUN Weikang(School of Safety Science and Emergency Management,Wuhan University of Technology,Wuhan Hubei 430070,China;School of Environmental and Chemical Engineering,Jiangsu Ocean University,Lianyungang Jiangsu 222005,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2021年第12期39-44,共6页
China Safety Science Journal
基金
国家自然科学基金资助(51774221)
国家重点研发计划(2018YFC0808500)
湖北省安全生产专项资金科技项目(KJZX202007004)。
关键词
泄压强度
浓度梯度
甲烷
爆炸特性
预混气体
爆炸超压
pressure relief strength
concentration gradient
methane
explosion characteristics
premixed gas
explosion overpressure
作者简介
陈先锋(1975-),男,湖北武汉人,博士,教授,主要从事工业安全与防火防爆技术。E-mail:cxf618@whut.edu.cn;刘丽娟,副教授;通信作者:雷松(1978-),男,湖北武汉人,博士,主要从事安全管理方面的研究。E-mail:704512846@qq.com。
