The DME-air-CO2 laminar premixed flames were simulated by using the CHEMKIN software .The adiabatic flame temperature and laminar flame speed of DME-air-CO2 were calculated under different equivalence ratios ,dilution ratios and di-lution modes and the influences of CO2 dilution effect ,thermal absorption effect and chemical effect in DME flames on them were distinguished .The results show that the three effects of CO2 result in the decrease in laminar flame speed and their influ-encing degrees from high to low are dilution effect ,chemical effect and thermal absorption effect .The chemical effect of CO2 has the greatest influence at the chemical equivalence ratio and weakens with the increase or decrease of mixture concentration .%利用Chemkin化学反应动力学模拟软件对预混层流二甲醚-空气-CO2一维自由传播火焰进行了数值模拟。计算了不同当量比、稀释系数及稀释形式下二甲醚-空气-CO2混合气的绝热火焰温度和层流火焰速度；区分了CO2在二甲醚火焰中稀释作用、吸热作用以及化学作用对层流火焰速度及绝热火焰温度的影响。结果表明：CO2的稀释作用、吸热作用和化学作用都会使混合气的层流火焰速度降低，稀释作用对层流火焰速度的影响占主导地位，其次是化学作用，吸热作用的影响很小；在化学当量比附近，CO2化学作用的影响最大，随着混合气变浓或者变稀，CO2化学作用的影响均逐渐减弱。
展开▼
