摘要
为改善氨燃料在船舶发动机中的冷启动困难问题,以MAN公司L23/30H型柴油机为目标机型构建三维仿真模型,采用掺混氢气的方式来改善氨燃料的燃烧,在进气道内预混氨氢燃料,基于CONVERGE软件数值模拟计算方法,探究掺氢比和点火时刻对发动机冷启动性能的影响。结果表明,在当量比为0.5,进气温度为340 K条件下,随着掺氢比增加,指示热效率增大,缸内燃烧效果提升显著,但NO_(x)排放也增加4.7倍;在15%掺氢比时,点火时刻最晚为10℃A BTDC时可正常点火,提前点火时刻至16℃A BTDC时,指示热效率最大,缸内压力峰值接近发动机所允许的最大压力,最有利于点火燃烧。
In order to improve the cold-start difficulties of ammonia fuel in marine engines,a three-dimensional simulation model was constructed with MAN’s L23/30H diesel engine as the target model,the hydrogen doping was used to improve the combustion of ammonia fuel by pre-mixing ammonia-hydrogen fuel in the intake tract,and the effects of hydrogen doping ratio and ignition moment on the cold-start performance of the engine were investigated based on numerical simulation and computation methods of CONVERGE software.The results showed that under the conditions of 0.5 equivalence ratio and 340 K intake temperature,with the increase of hydrogen doping ratio,the indicated thermal efficiency increased and the in-cylinder combustion effect was improved significantly,but the NO x emission also increased by 4.7 times;at 15%hydrogen doping ratio,the ignition timing can be normal at the latest of 10℃A BTDC,and the indicated thermal efficiency is maximum at the advance ignition timing of 16℃A BTDC,and the peak in-cylinder pressure is close to the allowable engine cold start.The peak pressure is close to the maximum pressure allowed by the engine,which is most favorable for ignition and combustion.
作者
王忠诚
成建山
郭浩
梁鹏
李升龙
WANG Zhong-cheng;CHEGN Jian-shan;GUO Hao;LIANG Peng;LI Sheng-long(Merchant Marine College,Shanghai Maritime University,Shanghai 201306,China)
出处
《船海工程》
北大核心
2026年第1期161-166,共6页
Ship & Ocean Engineering
基金
国家重点研发计划(2022YFB4300701)。
关键词
船舶
氨氢发动机
冷启动
燃烧
排放
ship
ammonia-hydrogen engine
cold start
burning
emission
