采用简化机理(19个基元反应,14种组分)和半详细机理(79个基元反应,32种组分)对层流拉伸非预混火焰的结构进行了数值模拟,通过与实验数据的对比发现:在由当量混合的标量耗散率表征的火焰拉伸一定时,考虑不同分子扩散系数和不同的化学反应机理均对火焰面结构的准确模拟有着重要影响.此外计算了考虑热辐射时,随着当量混合的标量耗散率的改变而变化的每单位火焰面面积放热速率和燃烧场的最高温度,并分析了层流非预混火焰的熄火现象.
Numerical simulations are performed to study the structure of strained laminar nonpremixed methane flames with a reduced mechanism and a semi-detailed mechanism.The comparison of experimental and numerical results suggests that when stoichiometric scalar dissipation rate is fixed,precise simulation for such a flame should incorporate difie!rent molecular diffusion and proper mechanism.Heat releasing rates per unit of flame area and maximum temperatures are calculated with heat radiation accounted within full range of flame stretch characterized by stoichiometric scalar dissipation rates.Extinction of the flame iS also analyzed.
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