Combustion Characteristics of Hydrogen-Natural Gas Mixtures in Passenger Car Engines 2007-24-0065
The presented concept in this study consists of a state of the art passenger car natural-gas engine fired by different hydrogen (H2) and compressed-natural-gas (CNG) fuel blends. The hydrogen content in the fuel was varied among 5 and 15vol% corresponding to 0.6-2.1 mass%, while comparisons include also engine operation on pure CNG.
Increasing hydrogen content of the fuel accelerated combustion leading to modest efficiency improvements. Combustion analysis showed that the increasing burning rates mainly affected the initial combustion phase (duration for 5% mass fraction burned).
With optimal combinations of spark timing and EGR rate the achievements are additional efficiency increase with substantially lower engine-out NOx while total unburned hydrocarbons or CO-engine-out emissions are not affected.
Investigations using Design of Experiments (DoE) algorithms provided a comprehensive picture of the entire parameter space. The investigations showed two fuel consumption optimal combustion domains: Low EGR and late spark timing with associated high engine-out NOx emissions as well as high EGR and early spark timing with very low engine-out NOx.
Citation: Dimopoulos, P., Boulouchos, K., Rechsteiner, C., Soltic, P. et al., "Combustion Characteristics of Hydrogen-Natural Gas Mixtures in Passenger Car Engines," SAE Technical Paper 2007-24-0065, 2007, https://doi.org/10.4271/2007-24-0065. Download Citation
Author(s):
P. Dimopoulos, K. Boulouchos, C. Rechsteiner, P. Soltic, R. Hotz
Affiliated:
Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for I.C. Engines
Pages: 15
Event:
8th International Conference on Engines for Automobiles
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 2007 Transactions Journal of Engines-V116-3
Related Topics:
Hydrogen fuel
Fuel consumption
Combustion and combustion processes
Exhaust gas recirculation (EGR)
Compressed natural gas
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