添加剂对甲醇均质充量压燃燃烧的影响

Effect of Additives on HCCI Combustion of Methanol

采用零维详细化学动力学模型,模拟了分别加入H2O2、CH2O两种添加剂的甲醇HCCI燃烧,分析了这两种添加剂对甲醇燃烧的影响。结果表明:H2O2、CH2O在缸内分解产生OH活性基,提高了OH的浓度,甲醇着火时刻提前,并且提高了缸内的压力和温度峰值。同时,CH2O能提高平均指示压力,H2O2通过控制着火时刻来影响平均指示压力的大小。

Using zero-dimensional detailed chemical kinetics model,methanol HCCI combustion adding two additives H2O2 and CH2O respectively was simulated to analyze influence of the additives on methanol combustion.Results reveal that the H2O2 and CH2O decompose in cylinder and generate OH radical,hence the OH radical concentration increases,causing the ignition delay shortening,cylinder peak pressure and temperature rising.Besides,addition of CH2O and H2O2 can enhance IMEP directly or indirectly.