Abstract
Behavior of intermediate species transiently formed in low temperature oxidation is a key to better understanding and control of compression ignition. In this study, we have applied a method of time resolved direct sampling from cylinder to detect such species in a test engine operated at HCCI mode with nOheptane as the fuel. It was observed that partial consumption of n-heptane and HCHO formation take place simultaneously, and the extent of these consumption and formation were in good agreement with predicted by the detailed chemical mechanism for oxidation of primary reference fuel proposed by Curran et al. In addition, experimental profiles of these species were also reasonably coincided with the simulation, when the timescale of the zero dimensional calculation was corrected for the heat release profiles to the experiment.
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