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A Numerical Study on the Effect of a Pre-Chamber Initiated Turbulent Jet on Main Chamber Combustion
Technical Paper
2022-01-0469
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
To elucidate the complex characteristics of pre-chamber combustion engines, the interaction of the hot gas jets initiated by an active narrow throated pre-chamber with lean premixed CH4/air in a heavy-duty engine was studied computationally. A twelve-hole KAUST proprietary pre-chamber geometry was investigated using CONVERGE software. The KAUST pre-chamber has an upper conical part with the spark plug, and fuel injector, followed by a straight narrow region called the throat and nozzles connecting the chambers. The simulations were run for an entire cycle, starting at the previous cycle's exhaust valve opening (EVO). The SAGE combustion model was used with the chemistry modeled using a reduced methane oxidation mechanism based on GRI Mech 3.0, which was validated against in-house OH chemiluminescence data from the optical engine experiments. Two different piston geometries, a flat piston geometry, and a more realistic bowl piston geometry were studied to understand the influence of jet on main chamber combustion. Varying the piston geometries results in different free jet times and hence main chamber combustion characteristics. Pre-chamber fuel ratio (PCFR) 6% of the total amount of fuel was investigated while keeping the global excess air ratios (λ) condition a constant value of 2.0. Both piston cases resulted in similar pre-chamber pressurization, with almost the same pre-chamber discharge and the equal pressure difference between pre-and main-chamber (ΔP) at the start of jet ejection. Different combustion behaviors were observed on analysis of the heat release rate in the main chamber. The importance of turbulence generated by the pre-chamber-initiated jets was further studied. It was observed that free jet time is a critical factor in developing turbulence in the main chamber. This increase in turbulence helps in increasing the burning velocity causing faster combustion. The influence of the jet-piston interaction is also analyzed as that determines the combustion behavior in the later CAD.
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Authors
- Sangeeth Sanal - King Abdullah University of Science and Technology
- Manuel Echeverri Marquez - King Abdullah University of Science and Technology
- Mickael Silva - King Abdullah University of Science and Technology
- Emre Cenker - Saudi Aramco
- Hong G. Im - King Abdullah University of Science and Technology
Topic
Citation
Sanal, S., Echeverri Marquez, M., Silva, M., Cenker, E. et al., "A Numerical Study on the Effect of a Pre-Chamber Initiated Turbulent Jet on Main Chamber Combustion," SAE Technical Paper 2022-01-0469, 2022, https://doi.org/10.4271/2022-01-0469.Also In
References
- Edwards , K.D. , Wagner , R.M. , Briggs , T.E. , and Theiss , T.J. Defining Engine Efficiency Limits 17th DEER Conference Detroit, MI October, 2011
- Zabetakis , M.G. Flammability Characteristics of Combustible Gases and Vapors Physical Chemistry Combustion and Ignition 1965 20 27
- Dale , J.D. , Smy , P.R. , and Clements , R.M. Laser Ignited Internal Combustion Engine - An Experimental Study SAE Technical Paper 780329 1978 https://doi.org/10.4271/780329
- Sher , E. , Ben-Ya’ish , J. , Pokryvailo , A. , and Spector , Y. A Corona Spark Plug System for Spark-Ignition Engines SAE Technical Paper 920810 1992 https://doi.org/10.4271/920810
- Correale , G. , Rakitin , A. , Nikipelov , A. , Pancheshnyi , S. et al. Non-Equilibrium Plasma Ignition for Internal Combustion Engines SAE Technical Paper 2011-24-0090 2011 https://doi.org/10.4271/2011-24-0090
- Attard , W. and Blaxill , H. A Single Fuel Pre-Chamber Jet Ignition Powertrain Achieving High Load, High Efficiency and Near Zero NOx Emissions SAE International Journal of Engines 5 3 2012 https://doi.org/10.4271/2011-01-2023
- Yamaguchi , S. , Ohiwa , N. , and Hasegawa , T. Ignition and Burning Process in a Divided Chamber Bomb Combustion and Flame 59 1985 177 187 10.1016/0010-2180(85)90023-9
- Gussak , L.A. High Chemical Activity of Incomplete Combustion Products and a Method of Prechamber Torch Ignition for Avalanche Activation of Combustion in Internal Combustion Engines SAE Transactions 84 1975 10.2307/44718096
- Shah , A. , Tunestal , P. , and Johansson , B. CFD Simulations of Pre-Chamber Jets' Mixing Characteristics in a Heavy Duty Natural Gas Engine SAE Technical Paper 2015-01-1890 2015 https://doi.org/10.4271/2015-01-1890
- Shah , A. , Tunestal , P. , and Johansson , B. Effect of Pre-Chamber Volume and Nozzle Diameter on Pre-Chamber Ignition in Heavy Duty Natural Gas Engines SAE Technical Paper 2015-01-0867 0867 2015 https://doi.org/10.4271/2015-01-0867
- Thelen , B.C. and Toulson , E. A Computational Study on the Effect of the Orifice Size on the Performance of a Turbulent Jet Ignition System Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 231 4 2016 536 554
- Biswas , S. 2018 10.1007/978-3-319-76243-2
- Biswas , S. , Tanvir , S. , Wang , H. , and Qiao , L. On Ignition Mechanisms of Premixed CH4/Air and H2/Air Using a Hot Turbulent Jet Generated by Pre-Chamber Combustion Applied Thermal Engineering 106 2016 925 937 10.1016/j.applthermaleng.2016.06.070
- Wang , N. , Liu , J. , Chang , W.L. , and Lee , C. A Numerical Study of the Combustion and Jet Characteristics of a Hydrogen Fueled Turbulent Hot-Jet Ignition (THJI) Chamber Int J Hydrogen Energy 43 45 2018 21102 21113 10.1016/j.ijhydene.2018.09.156
- Aronsson , U. , Chartier , C. , Horn , U. , Andersson , Ö. et al. Heat Release Comparison between Optical and All-Metal HSDI Diesel Engines SAE Technical Paper 2008-01-1062 2008 https://doi.org/10.4271/2008-01-1062
- Colban , W.F. , Kim , D. , Miles , P.C. , Oh , S. et al. A Detailed Comparison of Emissions and Combustion Performance between Optical and Metal Single-Cylinder Diesel Engines at Low Temperature Combustion Conditions SAE International Journal of Fuels and Lubricants 1 1 2009 505 519 https://doi.org/10.4271/2008-01-1066
- Kashdan , J. and Thirouard , B. Optical Engines as Representative Tools in the Development of New Combustion Engine Concepts Oil and Gas Science and Technology. 66 5 2011 759 777 10.2516/ogst/2011134
- Echeverri Marquez , M. , Hlaing , P. , Houidi , M.B. , Magnotti , G. et al. Optical Diagnostics of Pre-Chamber Combustion with Flat and Bowl-In Piston Combustion Chamber SAE Technical Paper 2021-01-0528 2021 https://doi.org/10.4271/2021-01-0528
- Sanal , S. , Silva , M. , Hlaing , P. , Cenker , E. et al. A Numerical Study on the Ignition of Lean CH4/Air Mixture by a Pre-Chamber-Initiated Turbulent Jet SAE Technical Paper 2020-01-0820 2020 https://doi.org/10.4271/2020-01-0820
- 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 https://doi.org/10.4271/2020-01-0821
- Som , S. , Aggarwal , S.K. 2010 10.1016/j.combustflame.2010.02.018
- Han , Z. , Reitz , R.D. 1995 10.1080/00102209508907782
- O'Rourke , P. and Amsden , A. The Tab Method for Numerical Calculation of Spray Droplet Breakup SAE Technical Paper 872089 1987 https://doi.org/10.4271/872089
- Lu , T. and Law , C.K. A Criterion based on Computational Singular Perturbation for the Identification of Quasi Steady State Species: A Reduced Mechanism for Methane Oxidation with NO Chemistry Combustion and Flame 154 4 2008 761 774 10.1016/j.combustflame.2008.04.025