Effects of Cetane Number, Aromatic Content and 90% Distillation Temperature on HCCI Combustion of Diesel Fuels

International Journal of Hydrogen Energy

2013

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/j.ijhydene.2013.06.084International Journal of Hydrogen Energy, 38, 26, pp. 11429-11437, 2013-07-17 The effect of hydrogen addition on combustion and emission characteristics of an n-heptane fuelled HCCI engine Guo, Hongsheng; Neill, W. Stuart The Effect of Hydrogen Addition on Combustion and EmissionCharacteristics of an n-Heptane Fuelled HCCI Engine AbstractThe mechanisms of the influence of hydrogen enrichment on the combustion and emission characteristics of an n-heptane fuelled homogeneous charge compression ignition (HCCI) engine was numerically investigated using a multi-zone model. The model calculation successfully captured most available experimental data. The results show that hydrogen addition retards combustion phasing of an n-heptane fuelled HCCI engine due to the dilution and chemical effects, with the dilution effect being more significant. It is because of the chemical effect that combustion duration is reduced at a constant compression ratio if an appropriate amount of hydrogen is added. As a result of retarded combustion phasing and reduced combustion duration, hydrogen addition increases indicated thermal efficiency at a constant combustion phasing. Hydrogen addition reduces indicated specific unburned hydrocarbon emissions, but slightly increases normalized unburned hydrocarbon emissions that are defined as the emissions per unit burned n-heptane mass. The increase in normalized unburned hydrocarbon emissions is caused by the presence of more remaining hydrocarbons that compete with hydrogen for some key radicals during high temperature combustion stage. At a given hydrogen addition level, N 2 O emissions increases with overly retarding combustion phasing, but hydrogen addition moderates this increase in N 2 O emissions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of hydrogen addition on combustion and emission characteristics of an n-heptane fuelled HCCI engine

International Journal of Hydrogen Energy

2013

Self Cite

show abstract

“…The exit temperature of the fuel vaporizer (T vap ) was maintained at a constant value of 220 C in the experiments. Further details about the engine setup and the fuel injector can be found elsewhere [7,8].…”

Section: Engine Setupmentioning

confidence: 99%

“…Diesel fuels usually have twostage combustion, a low temperature heat release (LTHR) stage that initiates the ignition process and a primary high temperature heat release (HTHR) stage. Appropriate combustion phasing and reasonable combustion duration are crucial for a diesel HCCI engine to obtain higher fuel conversion efficiency and lower pollutant emissions [6,7]. Hydrogen is a fuel with higher autoignition temperature [10] which may help to control the combustion phasing of a diesel engine.…”

Section: Introductionmentioning

confidence: 99%

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

Hosseini

International Journal of Hydrogen Energy

et al. 2011

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“…On the other hand, the two Supercetane fuel blends had significantly higher isHC emissions than the base fuel. A recent study [25] using the same engine and a fuel matrix specifically designed to investigate the effects of CN, aromatics, and T 90 distillation temperature on HCCI combustion and emissions provided evidence that the combination of high CN and low T 90 distillation temperature reduced isHC emissions. The current results show that a higher T 90 distillation temperature at a fixed CN increased isHC emissions.…”

Section: Regulated Emissions and Isfcmentioning

confidence: 99%

Effects of different cetane number enhancement strategies on HCCI combustion and emissions

Hosseini

International Journal of Engine Research

et al. 2011