多组分柴油/氨双燃料化学反应动力学简化机理研究

Aiming at the problem of simplifying the chemical reaction kinetics mechanism of diesel/ammonia,a simplified method of the chemical reaction kinetics mechanism of multi-component diesel/ammonia dual fuel based on ammonia,n-decane,isooctane,methylcyclohexane and toluene was proposed,and a mechanism model containing 90 species and 400 elementary reactions was obtained.The mechanism model was optimized using the OH radical sensitivity analysis method and validated by comparing the ignition delay test data measured by the rapid compressor.The results show that the chemical reaction kinetics mechanism can accurately predict the ignition delay period of diesel/ammonia over a wide range,and can be used for simulating the combustion characteristics of diesel/ammonia dual fuel under different ammonia energy substitution rates,temperatures,pressures,and equivalence ratios.Compared with existing detailed mechanism models,it was found that under the same operating conditions,not only can the calculation rate be improved by 93.3%,but also the prediction accuracy is higher.