摘要
低温可导致人员冻伤及物品脆裂,气体爆炸传播规律是爆炸演化过程和事故分析的基础。采用数值模拟方法,研究液化天然气大面积泄漏汽化过程、甲烷与空气混合过程及爆炸传播过程。结果表明:随着扩散距离的增大,低温区域的温度谷值升高,且升高趋势变缓;在距泄漏源中心110m范围内,温度低于273K;随着风速的增加,温度谷值呈线性下降;随着泄漏时间的延长,温度谷值降低,且下降趋势变缓;随着距泄漏中心距离的增加,爆炸后超压峰值先升高后降低;在距泄漏源中心200m范围内,爆炸产生的高温会对人员造成伤害。
It is known that low-temperature is apt to cause skin frost bite and material embrittlement,and that the propagation law of gas explosion is the foundation of explosion evolution and accident analysis.In this paper,we investigated the process of extensive gas leakage,gas mixing with air and explosion of the liquefied natural gas（LNG）in open space using numerical simulation.The results show that,as the diffusion distance increases,the lowest possible fluctuating temperature（i.e.temperature valley）of LNG increases,and this tendency gradually slows down;that the temperature is below 273 Kin the area within 110 m away from the leakage center;that the temperature valley decreases almost linearly as the wind velocity increases.As the leakage time gets longer,the temperature valley decreases,and so does its decreasing tendency.With the distance from the leakage center getting longer,the peak overpressure increases at first and then decreases.In the area within 200 maway from the leakage center,the high temperature produced by the explosion may pose a hazard to human casualties.
作者
任少云
REN Shaoyun(Department of Fire Com manding,The Chinese People＇s Armed Police Forces Academy,Langfang 065000,Hebei,Chin)
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2018年第4期891-897,共7页
Explosion and Shock Waves
基金
武警学院国家自然科学基金培育项目(ZKJJPY201621)
国家重点研发计划项目(2016YFC0800609)
关键词
液化天然气
泄漏
低温
浓度分布
爆炸
liquefied natural gas
leaking
low temperature
concentration distribution
explosion
