An experimental and modeling study on auto-ignition kinetics of ammonia/methanol mixtures at intermediate temperature and high pressure

A rapid compression machine (RCM) has been applied to measure the ignition delay times of NH3/CH3OH mixtures covering pressures 20 and 40 bar, equivalence ratios 0.5, 1.0 2.0, temperatures between 845 1100 K. The measurements show that become more reactive with increasing methanol addition. Addition merely 1% (molar basis) CH3OH NH3 lowers temperature around 100 K at bar in comparison pure NH3. is a complex function fuel mixture stoichiometry. For mixture, leaner are reactive, while reverse trend found for 5%, 20% CH3OH. Analysis pressure profiles shows three distinct modes mixtures, facilitated by pre-ignition heat release from consumption. detailed mechanism blends developed, capable reproducing behavior reasonable accuracy. subset amine / interactions was established, rate constants key reaction NH2 calculated ab initio theory. sensitivity analysis indicates critical reactions during auto-ignition process vary mole fraction fuel. ammonia chemistry, namely + NO, NO2 HO2, dominant CH3OH, related H2O2 important mixture. interaction prominent effect on 5% as compared those According modeling results, addition enrich O/H radical pool, consuming promoting through different pathways.