Combustion behaviors of a direct-injection engine operating on various fractions of natural gas-hydrogen blends

Jinhua Wang, Zuohua Huang, Yu Fang, Bing Liu, Ke Zeng, Haiyan Miao, Deming Jiang

Research output: Contribution to journalArticlepeer-review

175 Citations (Scopus)

Abstract

Combustion behaviors of a direct injection engine operating on various fractions of natural gas-hydrogen blends were investigated. The results showed that the brake effective thermal efficiency increased with the increase of hydrogen fraction at low and medium engine loads and high thermal efficiency was maintained at the high engine load. The phase of the heat release curve advanced with the increase of hydrogen fraction in the blends. The rapid combustion duration decreased and the heat release rate increased with the increase of hydrogen fraction in the blends. This phenomenon was more obviously at the low engine speed, suggesting that the effect of hydrogen addition on the enhancement of burning velocity plays more important role at relatively low cylinder air motion. The maximum mean gas temperature and the maximum rate of pressure rise increased remarkably when the hydrogen volumetric fraction exceeds 20% as the burning velocity increases exponentially with the increase of hydrogen fraction in fuel blends. Exhaust HC and CO2 concentrations decreased with the increase of the hydrogen fraction in fuel blends. Exhaust NOx concentration increased with the increase of hydrogen fraction at high engine load. The study suggested that the optimum hydrogen volumetric fraction in natural gas-hydrogen blends is around 20% to get the compromise in both engine performance and emissions.

Original languageEnglish
Pages (from-to)3555-3564
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume32
Issue number15
Early online date26 Apr 2007
DOIs
Publication statusPublished - 1 Oct 2007
Externally publishedYes

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