船用低速二冲程氢/柴油发动机数值模拟分析
Numerical simulation analysis of Marine low-speed two-stroke hydrogen/diesel engine
氢气作为零碳燃料是尽快使国际航运的温室气体（GHG）排放量达到峰值的最现实可行途径。论文以6EX340EF型超长冲程大功率低速船用柴油机为基础机型，设计得到预燃室射流点火的氢/柴油双燃料机，针对不同压缩比、引燃柴油量和有效压缩比对发动机进行三维数值模拟。结果表明：在喷油压力为100MPa，过量空气系数为2.5时，随着压缩比的升高，NOx排放和热效率增加；引燃柴油量增加，NOx排放增加，但指示热效率呈现先增加后降低的趋势；增加有效压缩比时，指示热效率增加，NOx降低，缸内温度降低。最终得到氢气机压缩比为13.5，引燃柴油量为1.5%时，NOx排放为0.74 g/kWh，单缸有效功率是原柴油机的87.4%，指示热效率为49.5%。
Hydrogen as a zero-carbon fuel is the most realistic and feasible way to peak greenhouse gas (GHG) emissions from international shipping as soon as possible. Based on 6EX340EF ultra-long stroke high-power low-speed Marine diesel engine, a hydrogen/diesel dual-fuel engine with pre-combustion chamber jet ignition is designed. Three-dimensional numerical simulation is carried out for the engine with different compression ratio, ignition diesel amount and effective compression ratio. The results show that when the injec-tion pressure is 100MPa and the excess air coefficient is 2.5, the emission and thermal efficiency increase with the increase of the compression ratio. With the increase of the amount of diesel fuel, the emission increases, but the indicating thermal efficiency increas-es first and then decreases. When the effective compression ratio is increased, the thermal efficiency is increased, the emission is re-duced, and the temperature in the cylinder is reduced. When the final hydrogen compressor ratio is 13.5, the amount of diesel fuel is 1.5%, the NOx is 0.74g /kWh, the effective power of the single cylinder is 87.4% of the original diesel engine, and the indicated thermal efficiency is 49.5%.
蒋庆丽;曲文静;夏雨;卢耀;冯立岩;
大连理工大学 能源与动力学院,辽宁 大连116024;大连理工大学 能源与动力学院,辽宁 大连116024;大连理工大学 能源与动力学院,辽宁 大连116024;大连理工大学 能源与动力学院,辽宁 大连116024;大连理工大学 能源与动力学院,辽宁 大连116024;
TK46+3
hydrogen thermal efficiency compression ratio the proportion of diesel energy effective compression ratio cylinder temperature
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