华中科技大学学报（自然科学版）2024，Vol.52Issue(1)：32-38,7.DOI:10.13245/j.hust.240519
氨/柴油双燃料船用中速发动机燃烧及排放特性
Combustion and emission characteristics of an ammonia/diesel dual fuel marine medium speed engine
摘要
Abstract
Computational fluid dynamics(CFD)numerical simulations were conducted based on a 400 mm bored marine medium-speed engine,in which ammonia was port injected and ignited by pilot diesel,to investigate the combustion and emission characteristics.The results showed that as the equivalent ratio of premixed ammonia increased,the combustion efficiency of ammonia and the peak firing pressure increased.The increase of diesel energy fraction led to improvement of combustion efficiency.However,extremely high diesel energy fraction resulted in incomplete combustion,which will lead to increased CO emissions.Moreover,a reasonable decrease of compression ratio led to extension of ignition delay,which increased combustion efficiency and indicated thermal efficiency.Finally,when the compression ratio,equivalence ratio of premixed ammonia,and diesel energy fraction are 13,0.55 and 10％,respectively,an excellent overall performances of the ammonia/diesel duel-fuel engine are achieved,yielding an in-cylinder peak firing pressure of 18.2MPa,an indicated thermal efficiency of 47.2％.关键词
船用发动机/氨气/柴油/当量比/柴油能量比/压缩比Key words
marine engine/ammonia/diesel/equivalence ratio/diesel energy fraction/compression ratio分类
能源科技引用本文复制引用
冷先银,高晓亮,魏胜利,何志霞..氨/柴油双燃料船用中速发动机燃烧及排放特性[J].华中科技大学学报（自然科学版）,2024,52(1):32-38,7.基金项目
国家自然科学基金面上项目(51876083) （51876083）
江苏省重点研发计划资助项目(BE2019009-5). （BE2019009-5）
