高压缩比氨/醇火花点火发动机燃烧排放特性研究
Investigation of combustion and emission characteristics of a high compression ratio spark ignition engine using alcohol/ammonia fuel
氨、乙醇和甲醇都是未来具有碳中和潜力的燃料，在发动机上利用醇类燃料增强氨的燃烧性能值得研究。本文分别选取乙醇、甲醇作为主燃料，与进气道喷射的氨气掺混燃烧，研究不同负荷下氨醇燃料在高压缩比条件下点燃式发动机中的燃烧排放特性。结果表明，小负荷、大掺氨比例工况下，得益于甲醇的高含氧率，氨-甲醇模式显示出较佳的燃烧持续期，实现了比氨-乙醇模式更高的指示热效率。使用乙醇、甲醇替代汽油在相近的NOx排放条件下，能显著降低温室气体排放，无论汽油还是醇类燃料，在大负荷、大掺氨比例工况下降低温室气体排放较小负荷工况更显著。
Ammonia, ethanol, and methanol are promising carbon-neutral fuels in the future. Therefore, the use of alcohol fuels to enhance ammonia combustion in engines deserves study. In this paper, ethanol and methanol are selected as the primary fuels, which are blended and combusted with ammonia injected in the intake port, to investigate the effect of ammonia-alcohol fuels on the combustion and emission characteristics of a high-compression-ratio spark ignition engine under different loads.The results show that under low load and large ammonia blending ratio conditions, due to the high oxygen content of methanol, the ammonia-methanol fuel mode exhibits a better combustion duration and achieves a higher indicated thermal efficiency than the ammonia-ethanol mode.The use of ethanol and methanol to replace gasoline significantly reduces greenhouse gas emissions under similar NOx emission conditions, and the reduction of greenhouse gas emissions is even more significant at high loads and ammonia blending ratios compared with low loads, regardless of gasoline or alcohol fuels.
林哲龙;刘尚;齐运亮;陈清楚;王志;
清华大学车辆与运载学院,北京 100084;清华大学车辆与运载学院,北京 100084;清华大学车辆与运载学院,北京 100084;清华大学车辆与运载学院,北京 100084;清华大学车辆与运载学院,北京 100084;
TK417.5
ammonia combustion ethanol methanol dual-fuel engine emissions
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