M.A. Eldeeb, S. Jouzdani, Z. Wang, S.M. Sarathy, B. Akih-Kumgeh
& Fuels, (2016)
A combined experimental and chemical kinetic modeling study of the
high-temperature ignition and pyrolysis of 1,3-dimethylcyclohexane
(13DMCH) is presented. Ignition delay times are measured behind
reflected shock waves over a temperature range of 1049–1544 K and
pressures of 3.0–12 atm. Pyrolysis is investigated at average pressures
of 4.0 atm at temperatures of 1238, 1302, and 1406 K. By means of
mid-infrared direct laser absorption at 3.39 μm, fuel concentration time
histories are measured under ignition and pyrolytic conditions. A
detailed chemical kinetic model for 13DMCH combustion is developed.
Ignition measurements show that the ignition delay times of 13DMCH are
longer than those of its isomer, ethylcyclohexane. The proposed chemical
kinetic model predicts reasonably well the effects of equivalence ratio
and pressure, with overall good agreement between predicted and
measured ignition delay times, except at low dilution levels and high
pressures. Simulated fuel concentration profiles agree reasonably well
with the measured profiles, and both highlight the influence of
pyrolysis on the overall ignition kinetics at high temperatures.
Sensitivity and reaction pathway analyses provide further insight into
the kinetic processes controlling ignition and pyrolysis. The work
contributes toward improved understanding and modeling of the oxidation
and pyrolysis kinetics of cycloalkanes.