| 李海娟,张海婷,陶磊,等.氢气直喷对发动机燃烧及排放性能的影响[J].内燃机工程,2022,43(5):48-53. |
| 氢气直喷对发动机燃烧及排放性能的影响 |
| Effects of Hydrogen Direct Injection on Combustion and Emission Performance of An Engine |
| DOI：10.13949/j.cnki.nrjgc.2022.05.007 |
| 关键词:汽油直喷 氢气 热效率 稀薄燃烧 排放 |
| Key Words:gasoline direct injection（GDI） hydrogen thermal efficiency lean burn emission |
| 基金项目:国家自然科学基金重点项目（51806143）；安徽省教育厅高等学校省级质量工程项目（2021jpkc016） |
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| 摘要:基于一台高压直喷汽油机，将汽油直喷喷射器替换为氢气直喷喷射器，试验研究了发动机燃用氢气与汽油时的燃烧和排放特性差异。采用空气稀释，进一步分析了氢气发动机稀薄燃烧模式下热效率提升潜力及氮氧化物排放特性，明确了氢气燃料对发动机燃烧及污染物排放的影响规律。结果表明，当量燃烧模式下，相比汽油发动机，氢气发动机的燃烧持续期明显缩短，有效热效率降低，NOx排放升高，CO及总碳氢（total hydrocarbon， THC）排放显著降低。提高氢气发动机的过量空气系数有助于改善有效热效率。在中等负荷工况下，过量空气系数为2.7时有效热效率可达43.5%。增大过量空气系数，氢气发动机能够在保持较高燃烧稳定性的情况下显著降低NOx排放。在低负荷工况下，当过量空气系数大于2.3时NOx排放最低可降低至44×10-6。 |
| Abstract:Based on a gasoline direct injection（GDI） engine， and the gasoline injector replaced by hydrogen injector， the differences of combustion and emission characteristics between hydrogen and gasoline were studied. The thermal efficiency improvement ability and NOx emission of hydrogen engine under lean burn were studied， and the influence tendency of hydrogen fuel on engine combustion and pollutant emission was clarified. The results show that at stoichiometric operation， compared with gasoline， hydrogen has shorter combustion duration， lower effective thermal efficiency， higher NOx emission and significantly lower CO and total hydrocarbon（THC） emissions. When the engine is fueled with hydrogen， with excess air factor increases， the effective thermal efficiency is improved，and the 43.5% thermal efficiency can be achieved when λ is 2.7. Under high excess air factor， hydrogen engine can significantly reduce NOx emission with good combustion stability. Under low loads， when λ is greater than 2.3， the minimum NOx emission can be reduced to 44×10-6. |
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