激波管中水对瓦斯爆炸反应动力学特性的影响

为揭示水对激波诱导瓦斯爆炸反应动力学特性的影响规律,运用化学反应动力学数值分析方法,建立了描述激波诱导瓦斯爆炸反应动力学特性的数学模型,就激波诱导瓦斯爆炸过程中水对爆炸温度、冲击波速度、反应物摩尔分数、自由基摩尔分数及主要致灾性气体摩尔分数变化趋势的影响进行了数值模拟研究与对比分析。研究结果表明:在一定范围内,随着初始混合气体中水含量的升高,激波诱导瓦斯爆炸后,爆炸温度、冲击波速度,以及O自由基、H自由基、CO、NO和NO2等的摩尔分数均依次降低,而CO2的摩尔分数则依次升高。这说明在一定范围内混合气体中含水量的增加,会降低瓦斯爆炸强度,促进CO2的生成,抑制CO,NO及NO2等有毒有害气体的生成,尤其对H自由基和O自由基的抑制作用最为显著。

Effects of water on reaction kinetic for gas explosion in shock tube

In order to study the effects of water on reaction kinetic for gas explosion in shock tube，by using numerical analysis method of reaction kinetics，a mathematical model was built for the shock wave-induced gas explosion.And the model was used to have numerical simulations and contrastive analyses to the effects of H2O on the variation tendencies of explosion temperature，shock wave velocity，mole fractions of reactants，radicals and main catastrophic gases.The results show that：in certain scope，along with initial gaseous mixture in H2O elevation，explosion temperature，shock wave velocity，and the mole fractions of O radical/H radical/CO/NO/NO2 decrease successively：on the contrary，the mole fractions of CO2 increase in turn.That is to say，within a certain range，with the H2O increasing，the gas explosion intension decreasing，the resultant of CO2 being promoted，the resultants of CO/NO/NO2 being inhibited，and the inhibiting effects to the H radical and O radical are more obvious especially.