This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Lean Burn Gasoline Fueled Pre-Chamber Jet Ignition Combustion System Achieving High Efficiency and Low NOx at Part Load
Technical Paper
2012-01-1146
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Turbulent Jet Ignition is an advanced spark-initiated
pre-chamber combustion system for otherwise standard spark ignition
engines. Combustion in the main chamber is initiated by jets of
partially combusted (reacting) pre-chamber products which provide a
high energy ignition source. The resultant widely distributed
ignition sites allow relatively small flame travel distances
enabling short combustion durations and high burn rates.
Demonstrated benefits include ultra lean operation (λ≻2) at part
load and high load knock limit extension.
Previous jet ignition experimental results have highlighted high
thermal efficiencies, high load capability and near-zero engine-out
NOx emissions in a standard contemporary engine platform. Although
previous results of this system have been very promising, the main
hurdle has been the need for a dual fuel system, with liquid
gasoline used in the main combustion chamber and small fractions of
gaseous propane in the pre-chamber. Initial attempts in replacing
the pre-chamber gaseous propane with liquid gasoline were
problematic, although engine operation was successful at some
operating conditions. The poor mixture preparation with liquid
gasoline inside the small pre-chamber cavity due to the limited
production injector hardware somewhat compromised the thermal
efficiency, resulting in slight elevations in NOx emissions. Since
specialized pre-chamber injector hardware was not available for
evaluation, the purpose of this paper is to demonstrate that this
combustion system can operate robustly using gasoline, with
vaporized gasoline found to be a successful pre-chamber fuel
substitute. With this concept at part load, the test engine
recorded a 41.4% peak thermal efficiency, ultra lean operation past
lambda 2.1, single-digit engine-out NOx emissions and a 20% peak
fuel economy improvement over the baseline spark ignition
system.
Recommended Content
Journal Article | A Gasoline Fueled Pre-Chamber Jet Ignition Combustion System at Unthrottled Conditions |
Technical Paper | Spark Ignition and Pre-Chamber Turbulent Jet Ignition Combustion Visualization |
Topic
Citation
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, https://doi.org/10.4271/2012-01-1146.Also In
References
- Toulson, E. Watson, H. Attard, W. “The Lean Limit and Emissions at Near-Idle for a Gasoline HAJI System with Alternative Pre-Chamber Fuels,” SAE Technical Paper 2007-24-0120 2007 10.4271/2007-24-0120
- Toulson, E. Watson, H. Attard, W. “Gas Assisted Jet Ignition of Ultra-Lean LPG in a Spark Ignition Engine,” SAE Technical Paper 2009-01-0506 2009 10.4271/2009-01-0506
- Toulson, E. Schock, H. Attard, W. “A Review of Pre-Chamber Initiated Jet Ignition Combustion Systems,” SAE Technical Paper 2010-01-2263 2010 10.4271/2010-01-2263
- Kyaw, Z.H. Watson, H.C. Hydrogen Assisted Jet Ignition for Near Elimination of NOx and Cyclic Variability in the S.I. Engine Twenty-Fourth Symposium on Combustion 1992 24 1 1449 1455
- Glasson, N. Lumsden, G. Dingli, R. Watson, H. “Development of the HAJI System for a Multi-Cylinder Spark Ignition Engine,” SAE Technical Paper 961104 1996 10.4271/961104
- Dober, G.G. Watson, H.W. Modelling the Flame Enhancement of a HAJI Equipped Spark Ignition Engine IPC-10 Proceedings 1999
- Lawrence, J. Watson, H. “Hydrocarbon Emissions from a HAJI Equipped Ultra-lean Burn SI Engine,” SAE Technical Paper 980044 1998 10.4271/980044
- Hamori, F. Watson, H.C. Hydrogen Assisted Jet Ignition for the Hydrogen Fuelled SI Engine World Hydrogen Energy Conference 2006 Lyon, France
- Toulson, E. Applying Alternative Fuels in Place of Hydrogen to the Jet Ignition Process Thesis (Ph.D.) Department of Mechanical and Manufacturing Engineering, University of Melbourne 2008
- Attard, W. Parsons, P. “A Normally Aspirated Spark Initiated Combustion System Capable of High Load, High Efficiency and Near Zero NOx Emissions in a Modern Vehicle Powertrain,” SAE Int. J. Engines 3 2 269 287 2010 10.4271/2010-01-2196
- Attard, W. Fraser, N. Parsons, P. 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. Bassett, M. Parsons, P. Blaxill, H. “A New Combustion System Achieving High Drive Cycle Fuel Economy Improvements in a Modern Vehicle Powertrain,” SAE Technical Paper 2011-01-0664 2011 10.4271/2011-01-0664
- Attard, W. Blaxill, H. “A Single Fuel Pre-Chamber Jet Ignition Powertrain Achieving High Load, High Efficiency and Near Zero NOx Emissions,” SAE Technical Paper 2011-01-2023 2011 10.4271/2011-01-2023
- Attard, W. Blaxill, H. Anderson, E. Litke, P. “Knock Limit Extension with a Gasoline Fueled Pre-Chamber Jet Igniter in a Modern Vehicle Powertrain,” SAE Technical Paper 2012-01-1143 2012 10.4271/2012-01-1143
- 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 Int. J. Engines 3 2 481 496 2010 10.4271/2010-32-0088
- Attard, W. Parsons, P. “Flame Kernel Development for a Spark Initiated Pre-Chamber Combustion System Capable of High Load, High Efficiency and Near Zero NOx Emissions,” SAE Int. J. Engines 3 2 408 427 2010 10.4271/2010-01-2260
- Attard, W. Toulson, E. Huisjen, A. Chen, X. et al. “Spark Ignition and Pre-Chamber Turbulent Jet Ignition Combustion Visualization,” SAE Technical Paper 2012-01-0823 2012 10.4271/2012-01-0823
- Attard, W. Blaxill, H. “A Gasoline Fueled Pre-Chamber Jet Ignition Combustion System at Unthrottled Conditions,” SAE Technical Paper 2012-01-0386 2012 10.4271/2012-01-0386
- Toulson, E. Watson, H. Attard, W. “Modeling Alternative Prechamber Fuels in Jet Assisted Ignition of Gasoline and LPG,” SAE Technical Paper 2009-01-0721 2009 10.4271/2009-01-0721