高温环境中烷烃爆炸上限的数值模拟研究

Numerical Prediction of Upper Flammability Limits of Alkanes in Air at High Temperatures

根据化学计量比处绝热火焰温度的概念,提出了高温爆炸上限绝热火焰温度的数值计算方法,探讨了绝热火焰温度随环境温度的变化规律,并根据建立的高温气体爆炸上限数值模型,对CH_(4)、C_(2)H_(6)、C_(3)H_(8)及i-C_(4)H_(10)在298~473 K温度条件下的爆炸上限进行了预测。结果表明:爆炸上限的预测值与实验值平均相对误差仅为1.56%,实现了高温环境中烷烃爆炸上限的准确预测。

Based on the concept of adiabatic flame temperature at stoichiometric ratio, a numerical calculating method about the UFL was established, and the variation of adiabatic flame temperature with environmental temperature was discussed. The UFL values of methane, ethane, propane and iso-butane were determined based on the UFL prediction model of combustible gas under temperature range of 298~473 K. The results showed that the relative error between the predicted value of the UFL and the experimental value was only 1.56%, and an accurate prediction of the UFL of the high temperature gas was realized.