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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CH_2O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CO_2和H_2O的反应引起。
Adding high octane fuel to high cetane fuel is an effective strategy to control HCCI combustion. In this paper, fast compressor was used to simulate the combustion process of HCCI engine. Iso-octane and ethanol were respectively added into n-heptane. The three-stage exothermic phenomenon of low-temperature exothermic and high-temperature two-stage exothermic appeared under partial lean combustion. Further detailed chemical kinetics simulation calculations show that ethanol can inhibit the combustion of n-heptane. The first stage of high temperature exotherm is mainly caused by the large amount of CO generated by CH_2O, and the second stage of high temperature exotherm is mainly caused by the reaction of CO_2 and H_2O, the final products of combustion.