An experimental study on the effect of hydrogen enrichment on diesel fueled HCCI combustion

Guo, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijhydene.2011.07.143
  3. Abstract:
  4. This paper experimentally investigates the influence of hydrogen enrichment on the combustion and emission characteristics of a diesel HCCI engine using a modified Cooperative Fuel Research (CFR) engine. Three fuels, n-heptane and two middle distillates with cetane numbers of 46.6 and 36.6, are studied. The results show that hydrogen enrichment retards the combustion phasing and reduces the combustion duration of a diesel HCCI engine. Besides, hydrogen enrichment increases the power output and fuel conversion efficiency, and improves the combustion stability. However, hydrogen enrichment may narrow the operational compression ratio range and increase the knocking tendency. Both the overall indicated specific CO emissions (isCO) and CO emissions per unit burned diesel fuel mass are reduced by hydrogen enrichment. Although hydrogen enrichment decreases the overall indicated specific unburned hydrocarbon emissions (isHC), it does not significantly affect the HC emissions per unit burned diesel fuel mass
  5. Keywords:
  6. Combustion process ; Exhaust emissions ; Homogeneous charge compression ignition (HCCI) ; CO emissions ; Combustion duration ; Combustion phasing ; Combustion pro-cess ; Combustion stability ; Effect of hydrogen ; Emission characteristics ; Exhaust emission ; Experimental studies ; Fuel conversion efficiencies ; Fuel research ; HC emissions ; HCCI combustion ; HCCI engine ; Hydrogen enrichment ; Middle distillates ; n-Heptanes ; Per unit ; Power out put ; Unburned hydrocarbons ; Compression ratio (machinery) ; Conversion efficiency ; Diesel fuels ; Fuels ; Heptane ; Hydrogen ; Internal combustion engines ; Petroleum distillates ; Ignition
  7. Source: International Journal of Hydrogen Energy ; Volume 36, Issue 21 , 2011 , Pages 13820-13830 ; 03603199 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S036031991101860X