Tailor-Made Fuels for Future Advanced Diesel Combustion Engines

Janßen, Andreas; Muether, Martin; Pischinger, Stefan; Kolbeck, Andreas; Lamping, Matthias; Koerfer, Thomas

doi:10.4271/2009-01-1811

Cited by 27 publications

(13 citation statements)

References 4 publications

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“…In the following all test results will be compared to available Diesel results which were carried out in a previous study using the same engine calibration [10]. The Diesel fuel meets the requirements of the EN 590 specifications.…”

Section: Figure 2 Molecular Composition Of Butyl Levulinatementioning

confidence: 98%

“…The increased emissions with BLT are caused by the longer ignition delay which leads to locally very lean air/fuel ratios. Hence, the incomplete combustion which results in increased CO-emissions is the consequence of decreased combustion temperatures which are not sufficiently high for a complete oxidation anymore [10].…”

Section: Co-emissions -Euro 6 Isnox -Levelmentioning

confidence: 99%

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Potential of Cellulose-Derived Biofuels for Soot Free Diesel Combustion

Janßen

Pischinger

Muether

2010

SAE Int. J. Fuels Lubr.

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Today's biofuels require large amounts of energy in the production process for the conversion from biomass into fuels with conventional properties. To reduce the amounts of energy needed, future fuels derived from biomass will have a molecular structure which is more similar to the respective feedstock.Butyl levulinate can be gained easily from levulinic acid which is produced by acid hydrolysis of cellulose. Thus, the Institute for Combustion Engines at RWTH Aachen University carried out a fuel investigation program to explore the potential of this biofuel compound, as a candidate for future compression ignition engines to reduce engine-out emissions while maintaining engine efficiency and an acceptable noise level.Previous investigations identified most desirable fuel properties like a reduced cetane number, an increased amount of oxygen content and a low boiling temperature for compression ignition engine conditions. Depending on the chain length, fuel compounds vary in cetane number and boiling temperature. Therefore different blends of butyl levulinate and n-tetradecane, a long-chain alkane, were investigated in this study.To gain knowledge about the combustion process with biofuels, experiments on a single cylinder diesel research engine were performed. Engine results with blends of butyl levulinate and n-tetradcanee are compared to regular diesel fuel and rapeseed oil methyl ester (B100) with respect to all regulated emissions.With the use of butyl levulinate the soot emissions can be significantly reduced up to 100 % depending on the load point. Furthermore, the experimental results indicate an additional potential for future diesel combustion concepts such as HCCI with respect to soot and NOx emissions in the part load range when using oxygenated fuels derived from biomass. Overall, the low particulate matter emissions provide justification for the consideration of butyl levulinate as a candidate for a fuel or fuel compound in future diesel engines. As a drawback malfunctions in various components of the fuel system like fuel hoses and fuel sealings can occur with the standard engine equipment.

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Section: Figure 2 Molecular Composition Of Butyl Levulinatementioning

confidence: 98%

Section: Co-emissions -Euro 6 Isnox -Levelmentioning

confidence: 99%

Potential of Cellulose-Derived Biofuels for Soot Free Diesel Combustion

Janßen

Pischinger

Muether

2010

SAE Int. J. Fuels Lubr.

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“…At every time step, the CFD code passes the scalar dissipation rate conditioned on stoichiometric mixturex st and the mean pressurep to the flamelet code. Based on this information, a presumed shape for the dissipation rate, and the given initial and boundary conditions, the flamelet code solves equation (1) in addition to an energy equation in similar form with time steps that may be much smaller. The solution yields species profiles for every species contained in the chemical reaction mechanism.…”

Section: Rif Modelmentioning

confidence: 99%

“…However, due to the low sooting propensity of the experimental fuels, high EGR rates can be employed, keeping NO x emissions within Euro 6 regulation limits. [1][2][3][4]…”

Section: Flame Structure and Fuel Effectsmentioning

confidence: 99%

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Surrogate fuels for the simulation of diesel engine combustion of novel biofuels

Kerschgens

Cai

Pitsch

et al. 2014

International Journal of Engine Research

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Recently, several promising biomass-derived fuels for diesel engines have been identified, produced, and tested. Diesel engine experiments confirmed very low soot and low nitrogen oxide emissions. With regard to further improvements of the combustion system, it is desirable to complement the diesel engine experiments with numerical simulations. To date, this is hindered by the lack of suitable chemical reaction mechanisms for these novel fuels. Therefore, a surrogate approach is presented here and applied in computational fluid dynamics simulations. Combustion and pollutant formation is simulated using the representative interactive flamelet model. Ignition, combustion, and pollutant formation are described in a consistent manner by inclusion of detailed reaction chemistry. Different mixtures of n-heptane, toluene, ethanol, dimethylether, ethane, and phenol are employed to describe the combustion chemistry of the biofuels. The compositions of the surrogate fuels are compiled according to hydrogen/carbon ratio, oxygen content, cetane rating, and molecular properties of the experimental fuels. Spray, injection, and evaporation properties of the experimental fuels, as obtained from spray vessel experiments, are included in the computational fluid dynamics simulations. By systematic comparison of experimental and numerical results, the surrogate methodology is validated and an improved understanding of the limitations of the current surrogates is achieved. Thus, a methodology for the fast adoption of novel fuels for simulations is proposed that can be used regardless of the availability of specific chemical reaction mechanisms.

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