This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Large Eddy Simulation of an Ignition Front in a Heavy Duty Partially Premixed Combustion Engine
Technical Paper
2019-24-0010
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
In partially premixed combustion engines high octane number fuels are injected into the cylinder during the late part of the compression cycle, giving the fuel and oxidizer enough time to mix into a desirable stratified mixture. If ignited by auto-ignition such a gas composition can react in a combustion mode dominated by ignition wave propagation. 3D-CFD modeling of such a combustion mode is challenging as the rate of fuel consumption can be dependent on both mixing history and turbulence acting on the reaction wave. This paper presents a large eddy simulation (LES) study of the effects of stratification in scalar concentration (enthalpy and reactant mass fraction) due to large scale turbulence on the propagation of reaction waves in PPC combustion engines. The studied case is a closed cycle simulation of a single cylinder of a Scania D13 engine running PRF81 (81% iso-octane and 19% n-heptane). Two injection timings are investigated; start of injection at -17 CAD aTDC and -30 CAD aTDC. One-equation transported turbulence sub-grid closure is used for the unresolved momentum and scalar fluxes and the fuel spray is modelled using a Lagrangian particle tracking (LPT) approach. Initial flow conditions (prior to intake valve closing) are generated using a scale forcing method with a prescribed large-scale swirl mean flow motion. Fuel reactivity is modeled using finite rate chemistry based on a skeletal chemical kinetic mechanism (44 species, 140 reactions). The results are compared with optical engine experimental data and satisfactory agreement with the experiments is obtained in terms of the liquid spray length, cylinder pressure trace and ignition location. A majority of the fuel consumption is found to be in ignition fronts where small variations in temperature at low fuel concentrations are observed to cause large stratification in ignition delay time.
Recommended Content
Authors
Topic
Citation
Ibron, C., Fatehi, H., Jangi, M., and Bai, X., "Large Eddy Simulation of an Ignition Front in a Heavy Duty Partially Premixed Combustion Engine," SAE Technical Paper 2019-24-0010, 2019, https://doi.org/10.4271/2019-24-0010.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 |
Also In
References
- Kalghatgi , G. T. , Risberg , P. , and Ångström , H.-E. Partially Pre-Mixed Auto-Ignition of Gasoline to Attain Low NOx at High Load in a Compression Ignition Engine and Comparison with a Diesel Fuel SAE Technical Paper 2007-01-0006 2007 10.4271/2007-01-0006
- Manente , V. , Zander , C.-G. , Johansson , B. , Tunestal , P. et al. An Advanced Internal Combustion Engine Concept for Low Emissions and High Efficiency from Idle to Max Load Using Gasoline Partially Premixed Combustion SAE Technical Paper 2010-01-2198 Mar. 2010 10.4271/2010-01-2198
- Inagaki , K. , Fuyuto , T. , Nishikawa , K. , Nakakita , K. et al. Dual-Fuel PCI Combustion Controlled by In-Cylinder Stratification of Ignitability SAE Technical Paper 2006-01-0028 Apr. 2006 10.4271/2006-01-0028
- Kimura , S. , Aoki , O. , Ogawa , H. , Muranaka , S. et al. New Combustion Concept for Ultra Clean and High Efficiency Small DI Diesel Engines SAE Technical Paper 1999-01-3681 1999 10.4271/1999-01-3681
- Musculus , M. P. B. , Miles , P. C. , and Pickett , L. M. Conceptual Models for Partially Premixed Low-Temperature Diesel Combustion Progress in Energy and Combustion Science 39 246 283 Apr. 2013 http://linkinghub.elsevier.com/retrieve/pii/S0360128512000548
- Zeldovich , Y. B. Regime Classification of an Exothermic Reaction with Nonuniform Initial Conditions Combustion and Flame 39 211 214 Oct. 1980 https://www.sciencedirect.com/science/article/pii/0010218080900176
- Sankaran , R. and Im , H. G. Characteristics of Autoignition in a Stratified Iso-Octane Mixture with Exhaust Gases under Homogeneous Charge Compression Ignition Conditions Combustion Theory and Modelling 9.3 417 432 Aug. 2005 10.1080/13647830500184108
- Chen , J. H. , Hawkes , E. R. , Sankaran , R. , Mason , S. D. et al. Direct Numerical Simulation of Ignition Front Propagation in a Constant Volume with Temperature Inhomogeneities I. Fundamental Analysis and Diagnostics Combustion and Flame 145 128 144 2006 www.elsevier.com/locate/combustflame
- Yu , R. and Bai , X.-S. Direct Numerical Simulation of Lean Hydrogen/Air Auto-Ignition in a Constant Volume Enclosure Combustion and Flame 160.9 1706 1716 Sept. 2013 https://www.sciencedirect.com/science/article/pii/S0010218013001259
- Bhagatwala , A. , Sankaran , R. , Kokjohn , S. , and Chen , J. H. Numerical Investigation of Spontaneous Flame Propagation under RCCI Conditions Combustion and Flame 162 3412 3426 Sept. 2015 https://www.sciencedirect.com/science/article/pii/S0010218015001844
- Peters , N. , Kerschgens , B. , and Paczko , G. Super-Knock Prediction Using a Refined Theory of Turbulence SAE International Journal of Engines 6 2 953 967 Apr. 2013 https://www.sae.org/content/2013-01-1109/
- Lu , L. , Najt , P. M. , Kuo , T.-w. , Sankaran , V. et al. A Fully Integrated Linear Eddy and Chemistry Agglomeration Method with Detailed Chemical Kinetics for Studying the Effect of Stratification on HCCI Combustion Fuel 105 653 663 Mar. 2013 https://www.sciencedirect.com/science/article/pii/S0016236112007442
- Yu , R. , Joelsson , T. , Bai , X. S. , and Johansson , B. Effect of Temperature Stratification on the Auto-Ignition of Lean Ethanol/Air Mixture in HCCI Engine June 2008 10.4271/2008-01-1669
- Ibron , C. , Jangi , M. , Lonn , S. , Matamis , A. et al. Effect of Injection Timing on the Ignition and Mode of Combustion in a HD PPC Engine Running Low Load SAE Technical Paper 2019-01-0211 Apr. 2019 10.4271/2019-01-0211
- Lonn , S. , Matamis , A. , Tuner , M. , Richter , M. et al. Optical Study of Fuel Spray Penetration and Initial Combustion Location under PPC Conditions SAE Technical Paper 2017-01-0752 Mar. 2017 10.4271/2017-01-0752
- Sagaut , P. Large Eddy Simulation for Incompressible Flows : An Introduction Springer-Verlag 2006 556
- Reitz , R. D. and Beale , J. C. Modeling Spray Atomization with the Kelvin-Helmholz/Rayleigh-Taylor Hybrid Model Atomization and Sprays 9 623 650 1999 http://www.dl.begellhouse.com/journals/6a7c7e10642258cc,2b018a87685a3d87,76af95984924bb68.html
- Liu , Y.-D. , Jia , M. , Xie , M.-Z. , and Pang , B. Enhancement on a Skeletal Kinetic Model for Primary Reference Fuel Oxidation by Using a Semidecoupling Methodology Energy & Fuels 26 7069 7083 Dec. 2012 10.1021/ef301242b
- Jangi , M. and Bai , X.-S. Multidimensional Chemistry Coordinate Mapping Approach for Combustion Modelling with Finite-Rate Chemistry Combustion Theory and Modelling 16 1109 1132 Dec. 2012 10.1080/13647830.2012.713518
- Fieweger , K. , Blumenthal , R. , and Adomeit , G. Self-Ignition of S.I. Engine Model Fuels: A Shock Tube Investigation at High Pressure Combustion and Flame 109 4 599 619 June 1997 https://www.sciencedirect.com/science/article/abs/pii/S0010218097000497
- Kodavasal , J. and Som , S. Gasoline Compression Ignition A Simulation-Based Perspective Singapore Springer 2018 227 249 10.1007/978-981-10-7575-9_12