| 摘要:甲醇/聚甲氧基二甲醚（polyoxymethylene dimethyl ether，PODE）二元燃料结合了甲醇高挥发性、高汽化潜热与PODE高十六烷值、高含氧量的优势，在船用发动机应用中展现出同时降低氮氧化物（NOx）和碳烟（soot）排放的巨大潜力。本文以船用4135ACa型柴油机为研究对象，系统研究喷射正时与喷射规律对燃用甲醇/PODE二元燃料时发动机燃烧与排放特性的影响规律。研究结果表明：缸压和平均温度峰值随燃料喷射正时的提前明显升高，对应的峰值相位提前。喷射正时的推迟恶化了缸内的燃烧情况，减少了高温区域的生成，导致NOx排放量减少。随着二元燃料喷射正时的推迟，soot的生成峰值呈上升趋势。在燃料二次喷射规律下，缸内最高燃烧压力最大。二元燃料采用二次喷射规律时，缸内平均燃烧温度较高，较高的温度和充足的氧气导致热力型NOx排放增加。 |
| 关键词: 甲醇/PODE 二元燃料 喷射正时 喷射规律 中速机 |
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| Influence of Methanol/PODE Dual-Fuel Injection Parameters on the Performance of a Marine Medium-Speed Engine |
| Guo Hao,Shang Zhengda,Yang Zhiyuan,Su Hong,Li Changxiong |
| Shanghai Maritime University， Shanghai 200135， China |
| Abstract:Methanol/polyoxymethylene dimethyl ether（PODE）dual-fuel combines the advantages of methanol''s high volatility and high latent heat of vaporization with PODE''s high cetane number and high oxygen content，demonstrating significant potential in marine engine applications for simultaneously reducing nitrogen oxides（NOx）and soot emissions.This paper takes a marine 4135ACa diesel engine as the research object and systematically investigates the effects of injection timing and injection strategy on the combustion and emission characteristics when operating on methanol/PODE dual-fuel.The results show that the peak cylinder pressure and average temperature significantly increase with the advancement of fuel injection timing，and the corresponding peak phases occur earlier.Delaying the injection timing deteriorates in-cylinder combustion，reduces the formation of high-temperature regions，and leads to a decrease in NOx emissions.As the dual-fuel injection timing is delayed，the peak soot formation shows an increasing trend.Under the split injection strategy，the maximum in-cylinder combustion pressure is the highest.When the dual-fuel adopts a split injection strategy，the average in-cylinder combustion temperature is higher，and the elevated temperature combined with sufficient oxygen results in increased thermal NOx emissions. |
| Key words: methanol/polyoxymethylene dimethyl ether dual-fuel injection timing injection strategy medium-speed engine |
