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The Oxidation Potential Number: An Index to Evaluate Inherent Soot Reduction in D.I. Diesel Spray Plumes

SAE International Journal of Engines

FEV GmbH-Hans Rohs
RWTH Aachen Univ.-Barbara Graziano, Benedikt Heuser, Florian Kremer, Stefan Pischinger
  • Journal Article
  • 2015-01-1934
Published 2015-09-01 by SAE International in United States
A new index to evaluate the inherent soot reduction in a diesel-like spray plume is proposed in this study. The index is named “Oxidation Potential Number” and was derived with the help of a computational fluid dynamics (CFD) software. C8 - C16 n-alkanes, 1-alcohols and di-n-ethers were studied with the help of this index over four part load engine operating conditions, representative of a C-class diesel vehicle. The CFD modelling results have shown that C8 molecules feature a higher potentiality to reduce the soot. Thus, C8 molecules were tested in a single cylinder diesel engine over the same operating conditions. In conclusion, the proposed index is compared with the soot engine out emission.
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On the Potential of Oxygenated Fuels as an Additional Degree of Freedom in the Mixture Formation in Direct Injection Diesel Engines

SAE International Journal of Fuels and Lubricants

FEV GmbH-Hans Rohs
PCFC RWTH Aachen University-Karl Alexander Heufer
  • Journal Article
  • 2015-01-0890
Published 2015-04-14 by SAE International in United States
The current and future restrictions on pollutant emissions from internal combustion engines require a holistic investigation of the abilities of alternative fuels to optimize the combustion process and ensure cleaner combustion. In this regard, the Tailor-made Fuels from Biomass (TMFB) Cluster at Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen University aims at designing production processes for biofuels as well as fuels optimal for use in internal combustion engines. The TMFB Cluster's scientific approach considers the molecular structure of the fuels as an additional degree of freedom for the optimization of both the production pathways and the combustion process of such novel biofuels. Thus, the model-based specification of target parameters is of the utmost importance to improve engine combustion performance and to send feedback information to the biofuel production process. In particular, computational fluid dynamics is used to underscore the role of the thermo-physical properties on the soot emissions in internal combustion engines. Utilizing a preliminary established sensitivity analysis, it was possible to identify C8 straight chain oxygenated molecules as the optimal candidate for the inherent reduction of…
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ERRATUM: On the Potential of Oxygenated Fuels as an Additional Degree of Freedom in the Mixture Formation in Direct Injection Diesel Engines

SAE International Journal of Fuels and Lubricants

RWTH Aachen Univ.-Barbara Graziano, Stefan Pischinger
Vka Rwth-Florian Kremer
  • Journal Article
  • 2015-01-0890.01
Published 2015-04-14 by SAE International in United States
The original Equation 3 found at the bottom of page 64 was erroneous.
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Modelling a Gasoline Compression Ignition (GCI) Engine Concept

Concawe-Roger F. Cracknell, Javier Ariztegui, Thomas Dubois, Heather Hamje, Leonardo Pellegrini, David Rickeard, Kenneth D. Rose
FEV GmbH-Karl Alexander Heufer, Hans Rohs
Published 2014-04-01 by SAE International in United States
Future engines and vehicles will be required to reduce both regulated and CO2 emissions. To achieve this performance, they will be configured with advanced hardware and engine control technology that will enable their operation on a broader range of fuel properties than today.Previous work has shown that an advanced compression ignition bench engine can operate successfully on a European market gasoline over a range of speed/load conditions while achieving diesel-like engine efficiency and acceptable regulated emissions and noise levels. Stable Gasoline CI (GCI) combustion using a European market gasoline was achieved at high to medium engine loads but combustion at lower loads was very sensitive to EGR rates, leading to longer ignition delays and a steep cylinder pressure rise. In general, the simultaneous optimisation of engine-out emissions and combustion noise was a considerable challenge and the engine could not be operated successfully at lower load conditions without an unrealistic amount of boost pressure.To identify ways to improve the lower load performance of a GCI engine concept, Computational Fluid Dynamics and KIVA simulations have now been…
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