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The Effects of Turbulent Jet Characteristics on Engine Performance Using a Pre-Chamber Combustor
Technical Paper
2014-01-1195
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Increasingly stringent US fuel economy regulation has emphasized the need for automotive engines to achieve greater levels of efficiency. Lean operation in spark ignition engines has demonstrated the ability to increase thermal efficiency, but this is typically accompanied by increased nitrogen oxides (NOx) emissions. Ultra-lean operation (λ > 2), however, has demonstrated increased thermal efficiency and the potential for significant reductions in NOx. Turbulent Jet Ignition (TJI) enables ultra-lean operation by utilizing radical turbulent jets emerging from a pre-chamber combustor as the ignition source for main chamber combustion in a spark ignition engine. This study seeks to better understand the interaction between the pre-chamber and main chamber combustion events, specifically the effect that particular TJI design parameters have on this interaction.
Engine data is acquired first on an optical engine and then on a single-cylinder metal engine, with both engines intended to emulate existing production designs. This common architecture basis adds a degree of confidence and validity to efforts to synthesize data between the engines. This synthesis enables engine performance data to be correlated with observed trends derived from image-based measurements of TJI jet characteristics.
TJI is shown to perform as anticipated, enabling ultra-lean operation and consequently increasing thermal efficiency and reducing NOx. Analyzing data from both optical and metal engines, it is determined that jet velocity and penetration exhibit sensitivities to certain design parameters. Furthermore, controlling jet velocity and targeting chamber penetration is imperative to optimizing TJI effectiveness in efficiently igniting the main chamber charge. The effect of nozzle design on engine performance, specifically thermal efficiency, is explored and discussed within the context of jet characteristic differences.
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Citation
Bunce, M., Blaxill, H., Kulatilaka, W., and Jiang, N., "The Effects of Turbulent Jet Characteristics on Engine Performance Using a Pre-Chamber Combustor," SAE Technical Paper 2014-01-1195, 2014, https://doi.org/10.4271/2014-01-1195.Also In
References
- Quader , A. Lean Combustion and the Misfire Limit in Spark Ignition Engines SAE Technical Paper 741055 1974 10.4271/741055
- Husted , H. , Piock , W. , and Ramsay , G. Fuel Efficiency Improvements from Lean, Stratified Combustion with a Solenoid Injector SAE Int. J. Engines 2 1 1359 1366 2009 10.4271/2009-01-1485
- Germane , G. , Wood , C. , and Hess , C. Lean Combustion in Spark-Ignited Internal Combustion Engines - A Review SAE Technical Paper 831694 1983 10.4271/831694
- Heywood , J. Internal Combustion Engine Fundamentals McGraw-Hill 1988
- Yamamoto , H. Investigation on Relationship Between Thermal Efficiency and NO x Formation in Ultra-Lean Combustion SAE Journal Paper JSAE 9938083 1999
- Dober , G. and Watson , H. Quasi-Dimensional and CFD Modelling of Turbulent and Chemical Flame Enhancement in an Ultra Lean Burn Engine S.I. SAE Technical Paper 2000-01-1263 2000 10.4271/2000-01-1263
- Ward , M. High-Energy Spark-Flow Coupling in an IC Engine for Ultra-Lean and High EGR Mixtures SAE Technical Paper 2001-01-0548 2001 10.4271/2001-01-0548
- Qiao , A. and Wu , X. Research on the New Ignition Control System of Lean- and Fast-Burn SI Engines SAE Technical Paper 2008-01-1721 2008 10.4271/2008-01-1721
- Ricardo , H. R. Recent Work on the Internal Combustion Engine SAE Transactions 17 May 1922
- Gussak , L. , Karpov , V. , and Tikhonov , Y. The Application of Lag-Process in Prechamber Engines SAE Technical Paper 790692 1979 10.4271/790692
- Robinet , C. , Higelin , P. , Moreau , B. , Pajot , O. et al. A New Firing Concept for Internal Combustion Engines: “I'APIR” SAE Technical Paper 1999-01-0621 1999 10.4271/1999-01-0621
- Murase , E. , Ono , S. , Hanada , K. , and Oppenheim , A. Pulsed Combustion Jet Ignition in Lean Mixtures SAE Technical Paper 942048 1994 10.4271/942048
- Toulson , E. , Schock , H. , and Attard , W. A Review of Pre-Chamber Initiated Jet Ignition Combustion Systems SAE Technical Paper 2010-01-2263 2010 10.4271/2010-01-2263
- Attard , W. , Fraser , N. , Parsons , P. , and Toulson , E. A Turbulent Jet Ignition Pre-Chamber Combustion System for Large Fuel Economy Improvements in a Modern Vehicle Powertrain SAE Int. J. Engines 3 2 20 37 2010 10.4271/2010-01-1457
- Attard , W. , Kohn , J. , Parsons , P. Ignition Energy Development for a Spark Initiated Combustion System Capable of High Load, High Efficiency and Near Zero NOx Emissions SAE Journal Paper JSAE 20109088 2010
- Attard , W. and Blaxill , H. A Gasoline Fueled Pre-Chamber Jet Ignition Combustion System at Unthrottled Conditions SAE Int. J. Engines 5 2 315 329 2012 10.4271/2012-01-0386
- Attard , W. and Blaxill , H. A Lean Burn Gasoline Fueled Pre-Chamber Jet Ignition Combustion System Achieving High Efficiency and Low NOx at Part Load SAE Technical Paper 2012-01-1146 2012 10.4271/2012-01-1146
- Gomes , J. , Valle , R. , Pujatti , F. , and Pereira , J. Torch Ignition System Analysis in an Spark Ignition Engine SAE Technical Paper 2005-01-4149 2005 10.4271/2005-01-4149
- Steeper , R. and Stevens , E. Characterization of Combustion, Piston Temperatures, Fuel Sprays, and Fuel-Air Mixing in a DISI Optical Engine SAE Technical Paper 2000-01-2900 2000 10.4271/2000-01-2900
- Grudno , A. , Trautwein , S. , Wassenberg , H. , and Adomeit , G. Spatially Resolved Determination of the Turbulent Flame Speed from CH Band Emission Measurements Under Engine Conditions SAE Technical Paper 940685 1994 10.4271/940685
- Zhao , H. Laser Diagnostics and Optical Measurement Techniques in Internal Combustion Engines SAE International Warrendale, PA 978-0-7680-5782-9 2012 10.4271/R-406