This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Investigation on Differences in Engine Efficiency with Regard to Fuel Volatility and Engine Load
Technical Paper
2008-01-2385
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
An HSDI Diesel engine was fuelled with standard Swedish environmental class 1 Diesel fuel (MK1), Soy methyl ester (B100) and n-heptane (PRF0) to study the effects of both operating conditions and fuel properties on engine performance, resulting emissions and spray characteristics.
All experiments were based on single injection diesel combustion. A load sweep was carried out between 2 and 10 bar IMEPg. For B100, a loss in combustion efficiency as well as ITE was observed at low load conditions. Observed differences in exhaust emissions were related to differences in mixing properties and spray characteristics.
For B100, the emission results differed strongest at low load conditions but converged to MK1-like results with increasing load and increasing intake pressures. For these cases, spray geometry calculations indicated a longer spray tip penetration length. For low-density fuels (PRF0) the spray spreading angle was higher. It was concluded that both, the spray geometry and the slightly longer injection event influence fuel air mixture generation disadvantageous at low load conditions.
An intake pressure variation showed that ignition delay (ID) shortened considerably for all fuel types. For B100, HC emissions as well as ITE improved with higher intake pressures. This behaviour was explained by improved spray characteristics and ambient gas conditions during the injection event.
Recommended Content
Authors
Topic
Citation
Horn, U., Egnell, R., Andersson, Ö., Johansson, B. et al., "Investigation on Differences in Engine Efficiency with Regard to Fuel Volatility and Engine Load," SAE Technical Paper 2008-01-2385, 2008, https://doi.org/10.4271/2008-01-2385.Also In
References
- Worldwatch Institute “Biofuels for Transport: Global potential and implication for energy and agriculture” EarthScan 2007 978-1-84407-422-8
- Hiroyasu, H Kadota, T. “Supplementary Comments: Fuel Spray Characterization in Diesel Engines” Combustion Modelling in Reciprocating Engines 369 408 Plenum Press 1980
- Naber, J. Siebers, D. “Effects of Gas Density and Vaporization on Penetration and Dispersion of Diesel Sprays” SAE 960034
- Siebers, D. “Scaling Liquid-Phase Fuel Penetration on Diesel Sprays Based on Mixing-Limited Vaporization” SAE 1999-01-0528
- Gimenes, T. “Final Project: Characterization of Diesel Sprays in the Eindhoven High Pressure Cell - Part III” 2006 Eindhoven University of Technology (TUe)
- Horn, U. Egnell, R. Andersson, Ö. “Detailed Heat Release Analyses With Regard To Combustion of RME and Oxygenated Fuels in a HSDI Diesel Engine” SAE 2007-01-0627
- Higgins, B. Mueller, C. Siebers, D. “Measurement of Fuel Effects on Liquid-Phase Penetration in DI Sprays” SAE 1999-01-0519