Effect of Blending Different Proportion of Isoamyl Alcohol on the Performance of Marine Diesel Engine
In order to study the combustion and emission characteristics of different proportions of isoamyl alcohol-diesel mixed fuel in 4190ZLC-2 marine medium speed diesel engine,the software of AVL_FIRE was used to establish a diesel engine combustion chamber model,and the accuracy of the simulation model was ver-ified by the bench test.In the simulation software,the effect of mixed fuel on the combustion and emission per-formance of diesel engine was evaluated by adjusting the mixing ratio of isoamyl alcohol in diesel.The results show that mixing isoamyl alcohol is beneficial to altering the generation mechanism of NO,resulting in an in-crease in the amount of NO generated during the fast burning period and a decrease during the slow burning and post-burning processes.The overall amount of NO generated decreases.As the blending ratio of isoamyl al-cohol increases,the final mass fraction of CO generation decreases,while the final mass fraction of Soot genera-tion increases.The peak mass fraction of Soot generated at the same time decreases,and the oxidation rate in-creases during the slow burning period.Due to the faster oxygen consumption,the final generated Soot mass fraction is higher than that of pure diesel.
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