掺烧不同比例的异戊醇对船舶柴油机性能的影响

Effect of Blending Different Proportion of Isoamyl Alcohol on the Performance of Marine Diesel Engine

为了研究不同比例的异戊醇/柴油混合燃料在4190Z L C-2型船用中速柴油机中的燃烧和排放特性,运用AVL_FIRE仿真软件建立柴油机燃烧室模型,并通过台架实验验证其仿真模型的准确性。在仿真软件中通过调整异戊醇在柴油中的掺混比来研究混合燃料对柴油机燃烧和排放性能的影响。结果表明:掺混异戊醇有助于改变NO的生成规律,使NO在速燃期的生成量上升,在缓燃期与后燃期的生成量减少,并且总体生成的NO质量分数降低;随着异戊醇掺混比的上升,CO最终生成质量分数下降,Soot最终生成质量分数上升,同时生成的Soot质量分数峰值降低,在缓燃期的氧化速率增快,并因为较快的耗氧量使得最终生成的Soot质量分数比纯柴油的高。

In order to study the combustion and emission characteristics of different proportions of isoamyl alcohol-diesel mixed fuel in 4190Z L C-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 verified by the bench test.In the simulation software,the effect of mixed fuel on the combustion and emission performance 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 increase 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 alcohol increases,the final mass fraction of CO generation decreases,while the final mass fraction of Soot generation increases.The peak mass fraction of Soot generated at the same time decreases,and the oxidation rate increases during the slow burning period.Due to the faster oxygen consumption,the final generated Soot mass fraction is higher than that of pure diesel.