在高十六烷值燃料中加入高辛烷值燃料是控制均质混合气压缩着火(HCCI)燃烧的一种有效策略.本文利用快速压缩机模拟发动机HCCI燃烧过程,在正庚烷中分别添加异辛烷和乙醇,发现在部分稀燃条件下出现低温放热和高温两阶段放热的三阶段放热现象.进一步采用详细化学动力学模拟计算,结果表明乙醇对正庚烷燃烧起到抑制作用.高温第一阶段放热主要由CH2O生成大量CO放热引起,高温第二阶段放热主要由生成燃烧最终产物CO2和H2O的反应引起.
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