不同当量比条件下矿井瓦斯爆炸过程的数值模拟  

Numerical Simulation on Mine Gas Explosion in Different Gas Content

作　　者：陈先锋[1,2] 张银[1,3] 许小江[1] 王亚平[1] 李星[1] 

机构地区：[1]武汉理工大学资源与环境工程学院,湖北武汉430070 [2]中国科学技术大学火灾科学国家重点实验室,安徽合肥230027 [3]中国水电顾问集团昆明勘测设计研究院,云南昆明650051

出　　处：《采矿与安全工程学报》2012年第3期429-433,共5页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(50804038;51174153);火灾科学国家重点实验室开放课题项目(HZ2011-KF06);公安部重点研究计划项目(2011ZDYJHBXF020)

摘　　要：为了研究管道预混火焰的传播特性及内在机理,运用数值模拟的方法,建立矿井瓦斯气体爆炸的数学模型和物理模型,对不同当量比浓度的矿井瓦斯气体爆炸过程进行模拟研究。计算结果表明,矿井瓦斯气体爆炸过程中速度和压力值均会经历上升-下降-二次波峰-下降-震荡的过程。火焰传播初期,气体爆燃体积迅速增大,火焰的速度、压力和温度随之迅速上升,并在一段时间内呈现层流燃烧状态。而后速度和压力图均出现了不同程度的波动,可知这是压力波和反射波共同作用的结果。速度和压力并未同时达到峰值,速度要超前于压力达到最大状态,这主要是爆炸压力波和反射压力波的相互叠加作用导致压力上升,而反射压力波导致速度下降。当量比浓度的压力、速度值最小,燃烧持续时间最长,此时气体还未完全加速,未形成爆轰状态。In this paper,to research the propagation rule and inherent mechanism of premixed flame in pipeline,we established the mathematical model and physical model by using numerical simulation method,and conducted simulation research on the process of mine gas explosion in different gas content.The calculation results show that both the velocity and pressure in gas explosion process experience the stages of ＂rise-fall-second wave-fall-swing＂.In the initial stage of the flame propagation,the de-flagration volume of gas increases rapidly,and the velocity,pressure and temperature of the flame also rise up quickly,and present laminar burning state during a certain time.Then,both the velocity and pressure have appeared swings in various degrees,which are the results of concurrent effects of pressure wave and reflected wave.Meanwhile,the velocity of the flame achieves the peak value ahead the pres sure,this is mainly attributed to the superimposition of explosion pressure wave and reflected pressure wave,which leads to the rise of pressure,while the reflected pressure wave leads to the decrease of ve-locity.The best content of mine gas is that the velocity and pressure are in the minimum value,and the gas burning lasts the longest time,in this time the mine gas hasn＇t been completely accelerated,and ha-ven＇t formed the detonation state.

关 键 词：瓦斯爆炸 当量比浓度 数值模拟 火焰传播 

分 类 号：TD712[矿业工程—矿井通风与安全]