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Experimental Assessment of the Heat Losses Due to the Adoption of a Passive Prechamber in a Jet Ignition 4-Stroke Engine
Technical Paper
2022-32-0060
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The passive prechamber concept, known as jet ignition (JI), represents an effective way to promote mixture ignitability, reduce combustion duration and extend knock limits in spark ignition engines. These aspects allow the adoption of a higher compression ratio and the operation in lean conditions, thus increasing thermal efficiency. Despite the potential benefits, the literature typically shows that in port fuel injection (PFI) engines at full load a shorter combustion duration does not necessarily translate in a growth of IMEP. Despite this issue has been frequently observed, the causes have not been fully explained. In previous works some of the authors supposed that the gain in indicated efficiency could be counterbalanced by the lower adiabatic efficiency, as a result of the higher heat exchange coefficient and the additional heat transfer from the prechamber surface. This paper thus aims at explaining the thermal losses of a single-cylinder four-stroke PFI engine, both in baseline and passive JI configurations, by means of the experimental measurement of the thermal power released to cooling system and exhaust gas. Results show a decrease of IMEP in the JI engine at low and medium speed, caused by the high heat transfer to the cooling medium which prevails on the lower heat flux released to the surrounding ambient. At high speed instead the JI engine shows an improved IMEP, but the raise of frictions due to the higher peak pressure leads anyway to a BMEP reduction. The sum of these features thus leads to a slightly lower engine power in the whole rpm range, explaining the limits of the investigated technology.
Authors
- Luca Romani - Università degli Studi di Firenze
- Lorenzo Bosi - Università degli Studi di Firenze
- Marco Ciampolini - Università degli Studi di Firenze
- Sandro Raspanti - Università degli Studi di Firenze
- Francesco Balduzzi - Università degli Studi di Firenze
- Giovanni Ferrara - Università degli Studi di Firenze
- Paolo Trassi - Betamotor s.p.a.
- Jacopo Fiaschi - Betamotor s.p.a.
- Davide Carpentiero - HPE s.r.l.
- Alessandro Fabbri - HPE s.r.l.
Topic
Citation
Romani, L., Bosi, L., Ciampolini, M., Raspanti, S. et al., "Experimental Assessment of the Heat Losses Due to the Adoption of a Passive Prechamber in a Jet Ignition 4-Stroke Engine," SAE Technical Paper 2022-32-0060, 2022, https://doi.org/10.4271/2022-32-0060.Also In
References
- Gholamisheeri , M. , Thelen , B.C. , Gentz , G.R. , Wichman , I.S. et al. Rapid compression machine study of a premixed, variable inlet density and flow rate, confined turbulent jet Combustion and Flame 169 321 332 2016 10.1016/j.combustflame.2016.05.001
- Gentz , G. , Thelen , B. , Gholamisheeri , M. , Litke , P. et al. A study of the influence of orifice diameter on a turbulent jet ignition system through combustion visualization and performance characterization in a rapid compression machine Applied Thermal Engineering 81 399 411 2015 10.1016/j.applthermaleng.2015.02.026
- Gentz , G. , Thelen , B. , Litke , P. , Hoke , J. et al. Combustion Visualization, Performance, and CFD Modeling of a Pre-Chamber Turbulent Jet Ignition System in a Rapid Compression Machine SAE Int. J. Engines 8 2 538 546 2015 10.4271/2015-01-0779
- Wöbke , M. , Reinicke , P.-B. , Rieß , M. et al. Characterization of the Ignition and Early Flame Propagation of Pre-Chamber Ignition System in a High Pressure Combustion Cell Ignition Systems for Gasoline Engines: 4th International Conference Berlin, Germany 2018
- Chiodi , M. , Kaechele , A. , Bargende , M. , Wichelhaus , D. , and Poetsch , C. Development of an Innovative Combustion Process: Spark-Assisted Compression Ignition SAE Int. J. Engines 10 5 2486 2499 2017 10.4271/2017-24-0147
- Roethlisberger , R.P. and Favrat , D. Investigation of the prechamber geometrical configuration of a natural gas spark ignition engine for cogeneration: part II. Experimentation International Journal of Thermal Sciences 42 3 239 253 2003 10.1016/S1290-0729(02)00024-8
- Silva , M. , Sanal , S. , Hlaing , P. , Cenker , E. et al. Effects of Geometry on Passive Pre-Chamber Combustion Characteristics SAE Technical Paper 2020-01–0821 2020 10.4271/2020-01-0821
- Attard , W.P. , 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.P. , Bassett , M. , Parsons , P. , and 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.P. and Blaxill , H. A Single Fuel Pre-Chamber Jet Ignition Powertrain Achieving High Load, High Efficiency and Near Zero NO x Emissions SAE Int. J. Engines 5 3 734 746 2011 10.4271/2011-01-2023
- Attard , W.P. , 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.P. , Blaxill , H. , Anderson , E.K. , and Litke , P. Knock Limit Extension with a Gasoline Fueled Pre-Chamber Jet Igniter in a Modern Vehicle Powertrain SAE Int. J. Engines 5 3 1201 1215 2012 10.4271/2012-01-1143
- 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 10.4271/2014-01-1195
- Bunce , M. , Cairns , A. , and Blaxill , H. The use of active jet ignition to overcome traditional challenges of pre-chamber combustors under low load conditions International Journal of Engine Research 22 11 3325 3339 2021 10.1177/1468087420972555
- Bunce , M. , Cairns , A. , Krishna Pothuraju Subramanyam, S. , Peters , N. et al. The Influence of Charge Motion on Pre-Chamber and Main Chamber Combustion in a Highly Dilute Jet Ignition Engine Frontiers in Mechanical Engineering 6 2021
- Date , T. , Yagi , S. , Ishizuya , A. , and Fujii , I. Research and Development of the Honda CVCC Engine SAE Technical Paper 740605 1974 10.4271/740605
- Brandstetter , W.R. , Decker , G. , Schafer , H.J. , and Steinke , D. The Volkswagen PCI Stratified Charge Concept-Results from the 1.6 Liter Air Cooled Engine SAE Technical Paper 741173 1974 10.4271/741173
- Garrett , T.K. Porsche stratified charge engine Environmental Science & Technology 9 9 826 830 1975 10.1021/es60107a009
- Gruden , D. Combustion and Exhaust Emission of an Engine Using the Porsche-Stratified-Charge-Chamber-System SAE Technical Paper 750888 1975 10.4271/750888
- Latsch , R. The Swirl-Chamber Spark Plug: A Means of Faster, More Uniform Energy Conversion in the Spark-Ignition Engine SAE Technical Paper 840455 1984 10.4271/840455
- Noguchi , M. , Sanda , S. , and Nakamura , N. Development of Toyota Lean Burn Engine SAE Technical Paper 760757 1976 10.4271/760757
- Adams , T.G. Theory and Evaluation of Auxiliary Combustion (Torch) Chambers SAE Technical Paper 780631 1978 10.4271/780631
- Sandoval , M.H.B. , Alvarez , C.E.C. , Roso , V.R. , Santos , N.D.S.A. , and Valle , R.M. The influence of volume variation in a homogeneous prechamber ignition system in combustion characteristics and exhaust emissions J Braz. Soc. Mech. Sci. Eng. 42 1 72 2020 10.1007/s40430-019-2156-2
- Mavinahally , N.S. , Assanis , D.N. , Govinda Mallan , K.R. , and Gopalakrishnan , K.V. Torch Ignition: Ideal for Lean Burn Premixed-Charge Engines J. Eng. Gas Turbines Power 116 4 793 798 1994 10.1115/1.2906887
- Hayashi , A.K. , Matsuura , K. , and Baba , S. Performance of a Flame Jet Ignition System in a Two-Stroke Engine SAE Technical Paper 2000-01–0199 2000 10.4271/2000-01-0199
- Gomes , J.R.C. , Valle , R.M. , Pujatti , F.J.P. , and Pereira , J.P. Torch Ignition System Analysis in an Spark Ignition Engine SAE Technical Paper 2005-01–4149 2005 10.4271/2005-01-4149
- Konishi , M. , Nakamura , N. , Oono , E. , Baika , T. , and Sanda , S. Effects of a Prechamber on NO x Formation Process in the SI Engine SAE Technical Paper 790389 1979 10.4271/790389
- Adams , T.G. Torch Ignition for Combustion Control of Lean Mixtures SAE Technical Paper 790440 1979 10.4271/790440
- Kettner , M. , Fischer , J. , Nauwerck , A. , Tribulowski , J. et al. The BPI Flame Jet Concept to Improve the Inflammation of Lean Burn Mixtures in Spark Ignited Engines SAE Technical Paper 2004-01–0035 2004 10.4271/2004-01-0035
- Kettner , M. , Rothe , M. , Velji , A. , Spicher , U. et al. A New Flame Jet Concept to Improve the Inflammation of Lean Burn Mixtures in SI Engines SAE Technical Paper 2005-01–3688 2005 10.4271/2005-01-3688
- Bosi , L. , Ciampolini , M. , Romani , L. , Balduzzi , F. et al. Experimental Analysis on the Effects of Passive Prechambers on a Small 2-Stroke Low-Pressure Direct Injection (LPDI) Engine SAE Technical Paper 2020-32-2305 10.4271/2020-32-2305
- Bosi , L. , Ciampolini , M. , Raspanti , S. , Romani , L. et al. Jet ignition in small two-stroke engines: an experimental survey on benefits and challenges E3S Web of Conferences 312 2021 10.1051/e3sconf/202131207012
- Weng , V. , Gindele , J. , Töpfer , G. , Spicher , U. et al. Investigation of the Bowl-Prechamber-Ignition (BPI) Concept in a Direct Injection Gasoline Engine at Part Load SAE Technical Paper 1999-01–3658 1999 10.4271/1999-01-3658
- Fu , L. , Ishima , T. , Long , W. , and Tian , J. Research on the Ignition-Chamber GDI Engine Combustion System Journal of Thermal Science and Technology 4 1 53 62 2009 10.1299/jtst.4.53
- Ciampolini , M. , Bigalli , S. , Balduzzi , F. , Bianchini , A. et al. CFD Analysis of the Fuel–Air Mixture Formation Process in Passive Prechambers for Use in a High-Pressure Direct Injection (HPDI) Two-Stroke Engine Energies 13 11 2846 2020 10.3390/en13112846
- Duan , W. , Huang , Z. , Chen , H. , Tang , P. et al. Effects of passive pre-chamber jet ignition on combustion and emission at gasoline engine Advances in Mechanical Engineering 13 12 2021 10.1177/16878140211067148
- Bedogni , F. , Magistrali , S. , Mazzoni , D. , Musu , E. et al. 2020
- Radicchi , F. de C. , Braga , R.M. , Coelho , R. de O.A. , Costa , R.B.R. et al. Numerical Analysis of the Fluid Flow in a Prechamber for a Spark-ignition Engine SAE Technical Paper 2015-36–0289 10.4271/2015-36-0289
- Borghi , F.T. , Moreira , T.A.A. , Whanco , R. , Barros , J.E.M. et al. Aerodynamic In-Cylinder Flow Simulation in an Internal Combustion Engine with Torch Ignition System SAE Technical Paper 2014-36-0298 2014 10.4271/2014-36-0298
- Bigalli , S. , Catalani , I. , Balduzzi , F. , Matteazzi , N. et al. Numerical Investigation on the Performance of a 4-Stroke Engine with Different Passive Pre-Chamber Geometries Using a Detailed Chemistry Solver Energies 15 14 4968 2022 10.3390/en15144968
- Kimura , N. , Kobayashi , H. , and Ishikawa , N. Study of Gasoline Pre-chamber combustion at Lean Operation Ignition Systems for Gasoline Engines : 4th International Conference Berlin, Germany 2018