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Evaluation of Knock Intensity and Knock-Limited Thermal Efficiency of Different Combustion Chambers in Stoichiometric Operation LNG Engine
Technical Paper
2019-01-1137
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Liquefied natural gas (LNG) engine could provide both reduced operating cost and reduction of greenhouse gas (GHG) emissions. Stoichiometric operation with EGR and the three-way catalyst has become a potential approach for commercial LNG engines to meet the Euro VI emissions legislation.
In the current study, numerical investigations on the knocking tendency of several combustion chambers with different geometries and corresponding performances were conducted using CONVERGE CFD code with G-equation flame propagation model coupled with a reduced natural gas chemical kinetic mechanism. The results showed that the CFD modeling approach could predict the knock phenomenon in LNG engines reasonably well under different thermodynamic and flow field conditions. The predicted threshold between “no knock” and “knock” conditions was found to be in good agreement with experimental results, which means it provides a valid way to estimate the capability of knock suppression and knock-limited thermal efficiency for the design and optimization of LNG combustion system. Based on the validated CFD model, the effects of combustion chamber structures on turbulent flow and combustion process were discussed. The results showed that lower mean flow velocity in the spark plug region and higher turbulent kinetic energy in the center of the combustion chamber and near the spark plug can be obtained with a shallow re-entrant chamber geometry at the time of ignition and during the early combustion stage, which could effectively promote the initial flame propagation. However, the knock propensity is also higher compared to other combustion chamber geometries, mainly due to the preheating of the flame front in the squish crevices and the suppression of flame propagation to the bottom of the combustion chamber, which limits the thermal efficiency improvement. In addition, it’s found that the thermal efficiency of the current LNG engine with aluminum piston is restricted by both the knock and durable peak in-cylinder pressure (mechanical strength). Therefore, it’s essential to develop effective combustion and knock control strategies under higher peak in-cylinder pressure conditions (with higher CR steel piston) to further improve the thermal efficiency of stoichiometric LNG engine.
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Zhao, X., Wang, H., Zheng, Z., Yao, M. et al., "Evaluation of Knock Intensity and Knock-Limited Thermal Efficiency of Different Combustion Chambers in Stoichiometric Operation LNG Engine," SAE Technical Paper 2019-01-1137, 2019, https://doi.org/10.4271/2019-01-1137.Data Sets - Support Documents
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References
- Chinese Vehicle Environment Management Annual Report, Ministry of Eco and Environment of the People's Republic of China 2018
- Mahendar , S.K. , Erlandsson , A. , and Adlercreutz , L. Challenges for Spark Ignition Engines in Heavy Duty Application: A Review SAE Technical Paper 2018-01-0907 2018 10.4271/2018-01-0907
- Sobiesiak , A. and Zhang , S. The First and Second Law Analysis of Spark Ignition Engine Fuelled with Compressed Natural Gas SAE Technical Paper 2003-01-3091 2003 10.4271/2003-01-3091
- Nellen , C. and Boulouchos , K. Natural Gas Engines for Cogeneration: Highest Efficiency and Near-Zero-Emissions Through Turbocharging, EGR and 3-Way Catalytic Converter SAE Technical Paper 2000-01-2825 2000 10.4271/2000-01-2825
- Kalghatgi , G. Knock Onset, Knock Intensity, Superknock and Preignition in Spark Ignition Engines International Journal of Engine Research 19 7 20 2018 10.1177/1468087417736430
- Soylu , S. Prediction of Knock Limited Operating Conditions of a Natural Gas Engine Energy Conversion and Management 46 121 138 2005 10.1016/j.enconman.2004.02.014
- Radu , B. , Martin , G. , Chiriac , R. , and Apostolescu , N. On the Knock Characteristics of LPG in a Spark Ignition Engine SAE Technical Paper 2005-01-3773 2005 10.4271/2005-01-3773
- Liang L. et al. Modeling Knock in Spark-Ignition Engines Using a G-equation Combustion Model Incorporating Detailed Chemical Kinetics SAE Technical Paper 2007-01-0165 2007 10.4271/2007-01-0165
- Pal , P. et al. Multi-Dimensional CFD Simulations of Knocking Combustion in a CFR Engine ASME. Internal Combustion Engine Division Fall Technical Conference 2017 10.1115/ICEF2017-3599
- Fontanesi , S. , Paltrinieri , S. , D'Adamo , A. , Cantore , G. et al. Knock Tendency Prediction in a High Performance Engine Using LES and Tabulated Chemistry SAE Int. J. Fuels Lubr. 6 98 118 2013 10.4271/2013-01-1082
- Zhen , X. et al. Study of Knock in a High Compression Ratio Spark-Ignition Methanol Engine by Multi-Dimensional Simulation Energy 50 150 159 2013 10.1016/j.energy.2012.09.062
- de Castro Viana E. , de Souza F. Langeani M. Effects of Swirl Motion on Methane Homogeneous Combustion in the AVL Tri- flow® System SAE Technical Paper 2009-36-0276 2009 10.4271/2009-36-0276
- Johansson , B. and Olsson , K. Combustion Chambers for Natural Gas SI Engines Part I: Fluid Flow and Combustion SAE Technical Paper 950469 1995 10.4271/950469
- Cartellieri , W.P.J.C. Mechanisms Leading to Stable and Efficient Combustion in Lean Burn Gas Engines JSME COMODIA 94 1994
- Einewall , P. and Johansson , B. Combustion Chambers for Supercharged Natural Gas Engines SAE Technical Paper 970221 1997 10.4271/970221
- Yan , B. et al. Experimental and Numerical Investigation of the Effects of Combustion Chamber Reentrant Level on Combustion Characteristics and Thermal Efficiency of Stoichiometric Operation Natural Gas Engine with EGR Applied Thermal Engineering 123 1473 1483 2017 10.1016/j.applthermaleng.2017.05.139
- Givler S. D. et al. Gasoline Combustion Modeling of Direct and Port-Fuel Injected Engines Using a Reduced Chemical Mechanism SAE Technical Paper 2013-01-1098 2013 10.4271/2013-01-1098
- Park , S. and Furukawa , T. Validation of Turbulent Combustion and Knocking Simulation in Spark-Ignition Engines Using Reduced Chemical Kinetics SAE Technical Paper 2015-01-0750 2015 10.4271/2015-01-0750
- Han , Z. and Reitz , R.D. Turbulence Modeling of Internal Combustion Engines Using RNG κ-ε Models Combustion Science and Technology 106 267 295 1995 10.1080/00102209508907782
- CONVERGE Users Guide & Reference Manual (Version 2.3) Convergent Science, Inc 2016
- N. J. C. Peters and Flame Turbulent Combustion Combustion & Flame 125 1222 1223 2000
- Gülder , Ö.L. Correlations of Laminar Combustion Data for Alternative S.I. Engine Fuels SAE Technical Paper 841000 1984 10.4271/841000
- Pope , S.B.J.F. The Computation of Constrained and Unconstrained Equilibrium Compositions of Ideal Gas Mixtures Using Gibbs Function Continuation Fda 2003
- Huang , J. et al. Shock-Tube Study of Methane Ignition Under Engine-Relevant Conditions: Experiments and Modeling Combustion and Flame 136 25 42 2004 10.1016/j.combustflame.2003.09.002
- Gregory , D.M.G. , Smith , P. , Frenklach , M. , Moriarty , N.W. , Eiteneer , B. , Goldenberg , M. , Bowman , C.T. , Hanson , R.K. , Song , S. , Gardiner , W.C. Jr. , Lissianski , V.V. , and Qin , Z. http://www.me.berkeley.edu/gri_mech/
- Shao , J. et al. A Shock Tube Study of Ignition Delay Times in Diluted Methane, Ethylene, Propene and Their Blends at Elevated Pressures 225 370 380 2018
- Beeckmann , J. et al. Collaborative Study for Accurate Measurements of Laminar Burning Velocity Proceedings of the European Combustion Meeting 2013 (ECM) 2013 1 6
- Hu , E. et al. Laminar Flame Speeds and Ignition Delay Times of Methane-Air Mixtures at Elevated Temperatures and Pressures Fuel 158 1 10 2015 10.1016/j.fuel.2015.05.010
- Rozenchan , G. et al. Outward Propagation, Burning Velocities, and Chemical Effects of Methane Flames up to 60 ATM Proceedings of the Combustion Institute 29 1461 1470 2002 10.1016/S1540-7489(02)80179-1
- Babajimopoulos , A. et al. A Fully Coupled Computational Fluid Dynamics and Multi-Zone Model with Detailed Chemical Kinetics for the Simulation of Premixed Charge Compression Ignition Engines 6 497 512 2005 10.1243/146808705x30503
- Draper , C.S. Pressure Waves Accompanying Detonation in the Internal Combustion Engine Journal of the Aeronautical Sciences 5 219 226 1938 10.2514/8.590
- Robert , A. et al. LES Prediction and Analysis of Knocking Combustion in a Spark Ignition Engine Proceedings of the Combustion Institute 35 2941 2948 2015 10.1016/j.proci.2014.05.154
- Li , F. et al. Improving Combustion and Emission Characteristics in Heavy-Duty Natural-Gas Engine by Using Pistons Enhancing Turbulence SAE Technical Paper 2018-01-1685 2018 10.4271/2018-01-1685