This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Effects of in-Cylinder Bulk Flow and Methane Supply Strategies on Charge Stratification, Combustion and Emissions of a Dual-Fuel DI Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 20, 2009 by SAE International in United States
Annotation ability available
In order to study the effects of air bulk motion and methane injection strategies on the development and pollutant levels of dual-fuel combustion, an intense experimental campaign was performed on a diesel common rail research engine with variable inlet configurations. Activating only the swirl or the tumble inlet valve of the engine, or both of them, it was possible to obtain, inside the cylinder, three different bulk flow structures. The air-methane mixture was obtained injecting the gaseous fuel into the inlet manifold varying its pressure and the injector position, either very close to the inlet valves, in order to obtain a stratified-like mixture, or more upstream, to obtain a homogeneous-like mixture. By combining the two different positions of the injector and the three air bulk flow structures, seven different inlet setup have been tested, at different values of engine speed and load. Moreover, the pilot injection parameters have been varied, such as diesel fuel quantity, pressure and injection advance. The complex interactions between the injected methane and the air flow structure, result in an evident effect on the emission levels, despite the fact that major differences in pressure and heat release rate time histories were not always observed. In particular, the obtained results show that, at low loads, the motion produced by the swirl inlet valve is able to induce a more rapid and complete combustion of the air-methane mixture after the ignition nuclei of the pilot fuel have burned, reducing at the same time the unburned hydrocarbons and nitrogen oxides content at the exhaust, especially injecting the methane with high pressure and in stratified-like configuration.
CitationCarlucci, A., Laforgia, D., and Saracino, R., "Effects of in-Cylinder Bulk Flow and Methane Supply Strategies on Charge Stratification, Combustion and Emissions of a Dual-Fuel DI Diesel Engine," SAE Technical Paper 2009-01-0949, 2009, https://doi.org/10.4271/2009-01-0949.
- Carlucci A.P. Ficarella A. Laforgia D. Experimental Comparison of Different Strategies for Natural Gas Addition in a Common Rail Diesel Engine” Proceedings of FISITA 2004 World Automotive Congress Barcelona (Spain) May 23-27, 2004
- Barata J. Performance and Emissions of a Dual Fueled DI Diesel Engine SAE Paper 952364 1995
- Daisho Y. Yaeo T. Koseki T. Saito T. Kihara R. Quiros E. Combustion and Exhaust Emissions in a Direct-injection Diesel Engine Dual-Fueled with Natural Gas SAE Paper 950465 1995
- Dishy A. Takahashi Y. Iwashiro Y. Nakayama S. Kihara R. Saito T. Controlling Combustion and Exhaust Emissions in a Direct-Injection Diesel Engine Dual-Fueled with Natural Gas SAE Paper 952436 1995
- Boulouchos K. Strategies for Future Engine Combustion Systems – Homogeneous or Stratified Charge? SAE Paper 2000-01-0650 2000
- Carlucci A.P. de Risi A. Laforgia D. Naccarato F. Experimental Investigation and Combustion Analysis of a Direct Injection Dual-Fuel Diesel–Natural Gas Engine Energy 33 2008 256 263
- Karim G. A. Liu Z. Jones W. Exhuast Emissions From Dual Fuel Engines At Light Load SAE Paper 932822 1993
- Stelmasiak Z. The Impact of Gas-Air Composition on Combustion Parameters of Dual- Fuel Engines Fed CNG SAE Paper 2002-01-2235 2002
- Tomita E. Kawahara N. Piao Z. Yamaguchi R. Effects of EGR and Early Injection of Diesel Fuel on Combustion Characteristics and Exhaust Emissions in a Methane Dual Fuel Engine SAE Paper 2002-01-2723 2002
- Liu Z. Karim G. A. The Ignition Delay Period in Dual-Fuel Engines SAE Paper 950466 1995