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The Role of Turbulent-Chemistry Interaction in Simulating End-of-Injection Combustion Transients in Diesel Sprays
Technical Paper
2017-01-0838
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This study investigates the role of turbulent-chemistry interaction in simulations of diesel spray combustion phenomena after end-of-injection (EOI), using the commercially-available CFD code CONVERGE. Recent experimental and computational studies have shown that the spray flame dynamics and mixture formation after EOI are governed by turbulent entrainment, coupled with rapid evolution of the thermo-chemical state of the mixture field. A few studies have shown that after EOI, mixtures between the injector nozzle and the lifted diffusion flame can ignite and appear to propagate back towards the injector nozzle via an auto-ignition reaction sequence; referred to as “combustion recession”. Because combustion recession occurs in the near-nozzle region, where characteristic fuel jet scales are on the order of the injector nozzle diameter, typical engine CFD simulations with relatively large grid scales may not accurately capture sub-grid scale turbulent mixing and mixing-chemistry interactions in this phenomenon. In this study, CFD simulations of combustion recession in diesel spray flames are executed to explore this topic. The Representative Interactive Flamelets (RIF) model with a multiple flamelets approach is employed to account for the non-uniformity of reactive scalars at the sub-grid scale. The results are compared with a laminar chemistry based combustion model, i.e. Well-Stirred Reactor (WSR) model. Both simulations are performed using a Reynolds-Averaged Navier-Stokes (RANS) framework, such that all the resolved quantities are characterized by ensemble average variables. Both chemistry modeling methods utilize the same chemical kinetics, so that the effect of turbulent-chemistry interaction can be assessed independent of kinetics. The results from both approaches are validated against experimental measurements of liquid and vapor penetration lengths under non-reacting conditions, and ignition delay time and flame lift-off length under reacting conditions. Results show that the combustion model choice plays a significant role in the prediction of both initial spray flame stabilization and combustion recession. The introduction of turbulent mixing in combustion modeling significantly changes the turbulent mean scalar fields, and may better represent unsteady flame flapping motions. This study also reveals that there are needed improvements to the RIF model to better account for fast changes in flamelet history associated with the local scalar dissipation rate, which is prevalent in diesel spray combustion problems.
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Kim, S., Jarrahbashi, D., and Genzale, C., "The Role of Turbulent-Chemistry Interaction in Simulating End-of-Injection Combustion Transients in Diesel Sprays," SAE Technical Paper 2017-01-0838, 2017, https://doi.org/10.4271/2017-01-0838.Data Sets - Support Documents
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References
- Amsden , A. A. , O’Rourke , P. J. , and Butler , T. D. KIVA-II: A computer program for chemically reactive flows with sprays Los Alamos National Laboratory Report No. LA-11560-MS 1989
- Barths , H. , Antoni , C. , and Peters , N. Three-Dimensional Simulation of Pollutant Formation in a DI Diesel Engine Using Multiple Interactive Flamelets SAE Technical Paper 982459 1998 10.4271/982459
- Barths , H. , Hasse , C. , Bikas , G. , and Peters , N Simulation of combustion in direction injection diesel engines using a Eulerian particle flamelet model Proceedings of the Combustion Institute 28 1 1161 1168 2000 10.1016/S0082-0784(00)80326-4
- Beale , J. C. , and Reitz , R. D. Modeling spray atomization with the Kelvin-Helmholtz/Rayleigh-Taylor hybrid model Atomization and Sprays 9 623 650 1999
- Bhattacharjee , S. and Haworth , D. C. Simulations of Transient n-Heptane and n-Dodecane Spray Flames under Engine-Relevant Conditions Using a Transported PDF Method Combustion and Flame 160 2083 2012 2013
- Cai , L. , Kroger , L. , and Pitsch , H. Reduced and Optimized Mechanism for n-Dodecane Oxidation 15th International Conference On Numerical Combustion Avignon, France April 19-22, 2015
- Colban , W. , Miles , P. , and Oh , S. Effect of Intake Pressure on Performance and Emissions in an Automotive Diesel Engine Operating in Low Temperature Combustion Regimes SAE Technical Paper 2007-01-4063 2007 10.4271/2007-01-4063
- Cantera http://www.cantera.org
- CONVERGE A three-dimensional computational fluid dynamics program for transient or steady-state flow with complex geometries CONVERGE 2.2 Theory Manual 2015
- D'Errico , G. , Lucchini , T. , Stagni , A. , Frassoldati , A. et al. Reduced Kinetic Mechanisms for Diesel Spray Combustion Simulations SAE Technical Paper 2013-24-0014 2013 10.4271/2013-24-0014
- ECN Engine Combustion Network http://ecn.sandia.gov
- Haworth , D. C. , Drake , M. C. , Pope , S. B. , and Blint , R. J. The importance of time-dependent flame structures in stretched laminar flamelet models for turbulent jet diffusion flames In Twenty-Second Symposium (international) on Combustion/The Combustion Institute 589 597 1988
- Jarrahbashi , D. , Kim , S. , and Genzale , C. L. Simulation of combustion recession after end-of-injection at diesel engine conditions Proceedings of the ASME 2016 Internal Combustion Engine Fall Technical Conference, ICEF2016-9433 2016
- Keeler , B. and Shayler , P. Constraints on Fuel Injection and EGR Strategies for Diesel PCCI-Type Combustion SAE Technical Paper 2008-01-1327 2008 10.4271/2008-01-1327
- Knox , B. , Genzale , C. , Pickett , L. , Garcia-Oliver , J. et al. Combustion Recession after End of Injection in Diesel Sprays SAE Int. J. Engines 8 2 679 695 2015 10.4271/2015-01-0797
- Knox , B. and Genzale , C. Effects of End-of-Injection Transients on Combustion Recession in Diesel Sprays SAE Int. J. Engines 9 2 932 949 2016 10.4271/2016-01-0745
- Koci , C. , Ra , Y. , Krieger , R. , Andrie , M. et al. Detailed Unburned Hydrocarbon Investigations in a Highly-Dilute Diesel Low Temperature Combustion Regime SAE Int. J. Engines 2 1 858 879 2009 10.4271/2009-01-0928
- Kook , S. , Bae , C. , Miles , P. , Choi , D. et al. The Influence of Charge Dilution and Injection Timing on Low-Temperature Diesel Combustion and Emissions SAE Technical Paper 2005-01-3837 2005 10.4271/2005-01-3837
- Kundu , P. , Pei , Y. , Wang , M. , Mandhapati , R. , and Som , S. Evaluation of turbulence-chemistry interaction under diesel engine conditions with multi-flamelet RIF model Atomiation and Sprays 24 9 779 800 2014 10.1615/AtomizSpr.2014010506
- Magnotti , G. M. , and Genzale , C. L. A novel spray model validation methodology using liquid-phase extinction measurements Atomization and Sprays 25 5 397 424 2015 10.1615/AtomizSpr.2014010377
- Mauss , F. , Keller , D. , and Peters , N. A lagrangian simulation on flamelet extinction and re-ignition in turbulent jet diffusion flames In Twenty-Third Symposium (international) on Combustion/The Combustion Institute 693 698 1990
- Musculus , M. , Lachaux , T. , Pickett , L. , and Idicheria , C. End-of-Injection Over-Mixing and Unburned Hydrocarbon Emissions in Low-Temperature-Combustion Diesel Engines SAE Technical Paper 2007-01-0907 2007 10.4271/2007-01-0907
- Narayanaswamy , K. , Perrine P. , and Heinz P. A chemical mechanism for low to high temperature oxidation of n-dodecane as a component of transportation fuel surrogates Combustion and Flame 161 4 866 884 2014
- Pei , Y. , Hawkes , E. R. , and Kook , S. A comprehensive study of effects of mixing and chemical kinetic models on predictions of n-heptane jet ignitions with the pdf method Flow, Turbulence and Combustion 91 249 280 2013
- Pei , Y. , Hawkes , E. R. , and Kook , S. Transported Probability Density Function Modelling of the Vapour Phase of an n -Heptane Jet at Diesel Engine Conditions Proceedings of the Combustion Institute 34 3039 3047 2013
- Pei , Y. , Hawkes , E. R. , Kook , S. , Goldin , G. M. , and Lu , T. Modelling n -dodecane spray and combustion with the transported probability density function method Combustion and Flame 162 2006 2019 2015
- Peters , N. Laminar diffusion flamelet models in non-premixed turbulent combustion Progress in Energy and Combustion Science 10 319 339 1984
- Pickett , L. M. , Genzale , C. L. , and Manin , J. Uncertainty in quantification of liquid penetration of evaporating sprays and diesel-like conditions Atomization and Sprays 25 5 425 452 2014 10.1615/AtomizSpr.2015010618
- Pitsch , H. , Wan , Y. , and Peters , N. Numerical Investigation of Soot Formation and Oxidation Under Diesel Engine Conditions SAE Technical Paper 952357 1995 10.4271/952357
- Pitsch , H. , Barths , H. , and Peters , N. Three-Dimensional Modeling of NOx and Soot Formation in DI-Diesel Engines Using Detailed Chemistry Based on the Interactive Flamelet Approach SAE Technical Paper 962057 1996 10.4271/962057
- Pitsch , H , Chen , M. , and Peters , N. Unsteady flamelet modeling of turbulent hydrogen-air diffusion flames In Twenty-Seventh Symposium (international) on Combustion/The Combustion Institute 1057 1064 1998
- Poinsot , T. , and Veynante , D. Theoretical and numerical combustion 2 nd Edwards 2004
- Vasu , S. S. , Davidson , D. F. , Hong , Z. , Vasudevan , V. , and Hanson , R. K. n -dodecane oxidation at high-pressures: Measurements of ignition delay times and oh concentration time-histories Proceedings of the Combustion Institute 32 173 180 2009
- Williams , F. N. Recent advances in theoretical descriptions of turbulent diffusion flames Turbulent Mixing in Nonreactive and Reactive Flows 1 18 New York Plenum Press 1975