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选用燃油JetA为航空燃料,建立了简化火焰锋面模型、燃烧化学平衡模型、燃烧动力学模型、燃油雾化模型、燃油蒸发模型及污染排放生成模型.采用基于燃烧室多反应器模型对发动机在不同工作状态下的排放产物NOx、未燃碳氢化合物(unburned hydrocarbons,UHC)和CO进行了计算.结果表明:燃烧室内火焰温度越高,NOx排放量越大.在发动机工作在低转速工况下时,燃油液滴的雾化直径大,造成CO与UHC排放量增加.基于燃烧室多反应器模型计算通用性强、速度快,适合与发动机性能程序相结合,在发动机设计阶段对发动机不同工作状态下的排放产物含量进行预测计算.
Based on the jet fuel JetA as aviation fuel, a simplified flame front model, a combustion chemical equilibrium model, a combustion kinetic model, a fuel atomization model, a fuel evaporation model and a pollutant emission modeling model were established.Based on the multi-reactor model of the combustion chamber, The exhaust NOx, unburned hydrocarbons (UHC) and CO under operating conditions were calculated.The results show that the higher the flame temperature in the combustion chamber, the greater the NOx emission.When the engine is operating at low speed , The atomization diameter of the fuel droplets is large, resulting in the increase of CO and UHC emissions.Based on multi-reactor combustor model calculation versatility, high speed, suitable combination with the engine performance program in the engine design phase of different work on the engine The state of emissions product content to predict the calculation.