中文摘要：

为考察惰性气体（N2）对瓦斯爆炸过程的影响,建立了受限空间（定容弹）中瓦斯爆炸反应的计算模型,化学反应采用详细反应机理（包括53种组分、325个反应）.结果显示,影响瓦斯爆炸及爆炸后部分致灾性气体生成的关键反应步有R32,R53,R98,R155,R156,R158,R161,R170,瓦斯爆炸会产生瞬间高温和高压,爆炸持续时间仅为0.0001s左右;惰性气体（N2）对瓦斯爆炸有抑制作用,混合气中N2浓度越大,瓦斯引爆时间越延迟,且随N2浓度增长,爆炸强度也越弱（充入10%,15%,20%N2,爆炸时间分别延迟0.0009,0.0013,0.0019s,爆炸后压力以约5.065kPa递减,爆炸温度以约35K递减）;在混合气体中充注N2能在一定程度上抑制CO,CO2,NO,NO2等有害气体的生成,含N2量增加抑制作用更明显.

英文摘要：

In order to seek the effect of inert gas（N2） on the process of gas explosion in enclosed space,the computational model of gas explosion in enclosed space（constant volume bomb） is built,and the detailed reaction mechanisms（including 53 species and 325 reactions） are adopted.The process is analyzed by applying this model.Through the sensitivity analysis of the reaction mechanisms of gas explosion,the key reactions that affect gas explosion and the formation of catastrophic gases are R32,R53,R98,R155,R156,R158,R161 and R170.And the inhibition mechanism of N2 on gas explosion and formation of catastrophic gases are analyzed.The results show that the gas explosion can produce transient high temperature and high pressure,and the duration of gas explosion is only 0.0001 s.The inert gas（N2） can inhibit the process of gas explosion,and the ignition time of gas explosion is more delayed with increasing of the mole fraction of N2 in the mixed gas.Correspondingly,the explosion intension is weaker（adding 10%,15% and 20% N2,the gas explosion time delays 0.0009,0.0013,and 0.0019 s respectively,the pressure decreases about 5.065 kPa progressively,the temperature decreases about 35 K progressively）.Furthermore,the inert gas（N2） will inhibit the formations of CO,CO2,NO and NO2.At the same time,with the mole fraction of N2 in the mixed gas increasing,the inhibition will be more distinct.