Temperature cross-over and non-thermal runaway at two-stage ignition of n-heptane

To calculate ignition delay times a skeletal 56-step mechanism for n-heptane is further reduced to a short 30-step mechanism containing two isomers of the n-heptyl-redical and reactions describing both the high temperature and the low temperature chemistry. This mechanism reproduces ignition delay times at various pressures and temperatures reasonably well. Steady state assumptions for many of the intermediate species are introduced to derive...