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给出了一个扩展的乙醇化学反应动力学机理并给予了验证。利用此扩展机理分别计算了不同初始条件下乙醇-空气混合气一维层流自由传播火焰中反应物、自由基、碳基中间产物和燃烧产物的分布规律,预测了NOx的浓度分布曲线。对于乙醇-空气火焰,得到的主要结论有:主要自由基OH、H和O浓度随初始压力增加而减小;随初始温度增加而增加;随氮气稀释度的增加而减小。自由基浓度随初始条件的变化规律部分地解释了实验和计算得到的层流燃烧速度随初始条件的变化规律。
An extended kinetic mechanism of ethanol chemical reaction is given and validated. The distribution mechanism of reactants, free radicals, carbon-based intermediates and combustion products in one-dimensional laminar flow of ethanol-air mixed gas under different initial conditions was calculated by using this extended mechanism respectively, and the NOx concentration distribution curve was predicted. The main conclusions for the ethanol-air flame are: OH, H and O concentrations of major free radicals decrease with increasing initial pressure; increase with initial temperature; decrease with increasing nitrogen dilution. The law of variation of free radical concentration with initial conditions partly explains the experimentally calculated and calculated variation of laminar flow rate with initial conditions.