A rapid compression machine study of the low temperature combustion of cyclohexane at elevated pressures

Ignition delay times have been measured in a rapid compression machine for cyclohexane/O2/N2/Ar mixtures with equivalence ratios of 0.5, 1.0 and 2.0 at elevated pressures of up to 40 bar and temperatures between 680 and 910 K. These data clearly show the negative-temperature-coefficient behavior for cyclohexane in the temperature range investigated. The predictions of several detailed kinetic models are compared to these new experimental validation data and these mechanisms have been analyzed to explain the obtained differences with a focus on the crucial peroxy-chemistry of the primary radicals. The presented data are the first set of ignition delay times at elevated pressures for the low-temperature range.