要实现国际海事组织IMO制定的2050年航运业温室气体减排目标，船舶动力系统需朝着高效清洁的方向转变。本研究主要关注小负荷缸内直喷的船舶甲醇/柴油双燃料发动机，借助Converge三维CFD仿真软件来构建模型，着重探讨甲醇替代率处于10%～80%这个范围时，发动机燃烧、排放和经济指标的影响。结果表明，随着替代率不断提高，缸内爆压呈现出下降的态势，CA50则呈现出上升的趋势，CO排放有所增加，soot和NOx排放呈现出降低的态势，ITE呈现出上升的趋势，EISFC则呈现出下降的态势。Rm为80%的时候，缸内爆压降低了3.1%，CO含量增加了66%，soot排放可降低92.7%，NOx排放可降低40.6%，燃油消耗率下降了4.2%，指示热效率可达到46.5%。
To achieve the 2050 greenhouse gas reduction target set by the International Maritime Organization (IMO), ship power systems need to be transformed in the direction of efficient and clean. This study focuses on the methanol/diesel dual-fuel engine of the ship with small load in-cylinder direct injection, and uses Converge 3D CFD simulation software to build a model, focusing on the impact of engine combustion, emissions and economic indicators when the methanol substitution rate is in the range of 10% to 80%. The results show that with the continuous improvement of the substitution rate, the burst pressure in the cylinder shows a downward trend, while the CA50 shows an upward trend, the CO emission increases, the soot and NOx emissions show a decreasing trend, the ITE shows an upward trend, and the EISFC shows a decreasing trend. When the Rm is 80%, the burst pressure in the cylinder can be reduced by 3.1%, the CO content can be increased by 66%, the soot emission can be reduced by 92.7%, the NOx emission can be reduced by 40.6%, the fuel consumption rate can be decreased by 4.2%, and the indicated thermal efficiency can reach 46.5%.
2026,12(4): 76-83 收稿日期：2025-5-30
DOI：10.3404/j.issn.1672-7649.2026.04.012
分类号：U664.81
作者简介：陈家瑞(2000-),男,硕士研究生,研究方向为甲醇燃料供应系统及燃烧性能
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