Towards a better understanding of the combustion of oxygenated aromatic hydrocarbons. Comparing benzene, toluene, phenol and anisole with ignition delay times in a rapid compression machine
Ignition delay times (IDTs) of the oxygenated aromatic hydrocarbons (OAHCs) anisole (C6H5OCH3) and phenol
(C6H5OH) and the analogues non-oxygenated aromatic hydrocarbons (AHCs) toluene (C6H5CH3) and benzene (C6H6)
have been measured in the PCFC rapid compression machine (RCM) at stoichiometric, fuel-in-air conditions. With
the two targeted compression pressures () of 1 and 2 MPa a temperature range of 870 to 1100 K was covered. The
IDTs of all four molecules revealed an Arrhenius behavior. The different reactivity can be ranked as the following,
starting with the lowest reactivity: benzene < toluene < phenol < anisole. Literature available models containing
anisole and phenol have been used to simulate the IDTs of this study highlighting discrepancies in both, model to
experiment and model to model accordance. Finally, the CRECK mechanism was used to conduct rate-of-production
(ROP) and sensitivity analysis to gain insight into the combustion of OAHCs and highlight interconnections and
shortcomings of OAHCs
