This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Numerical Investigation on Combustion Characteristics with the use of Post Injection in DI Diesel Engines
Technical Paper
2010-01-1260
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Post injections are a commonly used strategy to reduce soot and NOx emissions in DI diesel engines. This strategy has been widely explored and studied for several years, however, there are still some aspects of the behavior of the combustion process when it is used that are not completely well known. In this paper a numerical study is carried out in order to better understand the improvement on mixing/combustion phenomena using post injection compared with a single injection case. For this purpose, CFD simulations using commercial code Star CD were performed in realistic engine conditions: the combustion of a single injection case (Pilot + Main injection) was compared with that of post injection case (Pilot + Main + Post) evaluating different post injection timings and comparing the simulated results with previously developed experimental tests which reveal the mentioned improvement on combustion behavior. The results show that if the post injection is placed near enough the main injection, the end of combustion can take place even earlier compared to the case with a single main injection as in the experimental cases. These simulations have helped to understand why an acceleration of the combustion process takes place when a small and close post injection is used. As in many other cases, CFD has proved to be an interesting tool to understand the complex phenomena involved during combustion processes.
Recommended Content
Authors
Citation
Molina, S., Desantes, J., Garcia, A., and Pastor, J., "A Numerical Investigation on Combustion Characteristics with the use of Post Injection in DI Diesel Engines," SAE Technical Paper 2010-01-1260, 2010, https://doi.org/10.4271/2010-01-1260.Also In
References
- Dec, J.E. “A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging,” SAE Technical Paper 970873 1997
- Senatore, A. Cardone, M. Buono, D. Sessa, G. “Experimental Study of Lean NOx Trap Management,” SAE Paper 2007-01-3442 2007
- Hiranuma, S. Takeda, Y. Kawatani, T. Doumeki, R. et al. “Development of DPF System for Commercial Vehicle - Basic Characteristic and Active Regenerating Performance,” SAE Technical Paper 2003-01-3182 2003
- Nehmer, D. Reitz, R.D. “Measurement of the Effect of Injection Rate and Split Injections on Diesel Engine Soot and NOx Emissions,” SAE Technical Paper 940668 1994
- Tow, T.C. Pierpont, D.A. Reitz, R.D. “Reducing Particulate and NOx Emissions by Using Multiple Injections in a Heavy Duty D.I. Diesel Engine,” SAE Technical Paper 940897 1994
- Hasse, C. Barths, H. Peters, N. “Modelling the Effect of Split Injections in Diesel Engines Using Representative Interactive Flamelets,” SAE Technical Paper 1999-01-3547 1999
- Chen, S.K. “Simultaneous Reduction of NOx and Particulate Emissions by Using Multiple Injections in a Small Diesel Engine,” SAE Technical Paper 2000-01-3084 2000
- Bianchi, G.M. Pelloni, P. Corcione, F.E. Luppino, F. “Numerical Analysis of Passenger Car HSDI Diesel Engines with the 2nd Generation of Common Rail Injection Systems: The Effect of Multiple Injections on Emissions,” SAE Technical Paper 2001-01-1068 2001
- Hotta, Y. Inayoshi, M. Nakakita, K. Fujiwara, K. et al. “Achieving Lower Exhaust Emissions and Better Performance in an HSDI Diesel Engine with Multiple Injection,” SAE Technical Paper 2005-01-0928 2005
- Bakenhus, M. Reitz, R.D. “Two Color Combustion Visualization of Single and Split Injections in a Single Cylinder Heavy Duty D.I. Diesel Engine Using an Endoscope Based Imaging System,” SAE Technical Paper 1999-01-1112 1999
- Ehleskog, R. Ochoterena, R.L. Andersson, S. “Effects of Multiple Injections on Engine Out Emission Levels Including Particulate Mass from HSDI Diesel Engine,” SAE Technical Paper 2007-01-0910 2007
- Desantes, J.M. Arrègle, J. López, J.J. García, A. “A Comprehensive Study of Diesel Combustion and Emissions with Post-Injection,” SAE Technical Paper 2007-01-0915 2007
- Ehleskog, R. Golovitchev, V. Denbratt, I. Andersson, S. et al. “Experimental and Numerical Investigation of Split Injections at Low Load in an HDDI Diesel Engine Equipped with a Piezo Injector,” SAE Technical Paper 2006-01-3433 2006
- Star-CD Methodology, Version 3.26 CD-Adapco 2005
- Dukowicz J. K. “A Particle-Fluid Numerical Model for Liquid Sprays” Comp. Physics 35 229 253
- Huh K. Y. Gosman A.D. “A phenomenological model of Diesel spray atomization” Proc. Int. Conf. On Multiphase Flows 1991
- Reitz, R.D. Diwakar, R. “Structure of High-Pressure Fuel Spray,” SAE Technical Paper 870598 1987
- Desantes J.M. Margot X. Pastor J.M. Chavez M. Pinzello A. “CFD-Phenomenological Diesel Spray Analysis Under Evaporative Conditions” Energy & Fuels 23 3919 3929 2009
- Payri R. Garcia J. M Salvador F. J. Gimeno J. “Using spray momentum flux measurements to understand the influenceof diesel nozzle geometry on spray characteristics” Fuel 84 551 561 2005
- Habchi, C. Lafossas, F.A. Béard, P. Broseta, D. “Formulation of a One-Component Fuel Lumping Model to Assess the Effects of Fuel Thermodynamic Properties on Internal Combustion Engine Mixture Preparation and Combustion,” SAE Technical Paper 2004-01-1996 2004
- Duclos J.M. Zellat M. Duranti S. “Towards a universal combustion model in StarCD for IC engines: from GDI to HCCI and application to DI diesel combustion optimization” Multi-dimensional Engine Modelling Users Conference Detroit (USA) 2003
- Colin O. Benkenida A. “The 3-zones extended coherent flame model (ECFM3Z) for computing premixed/diffusion combustion” Oil and Gas Science and Technology - Review IFP 59 6 593 609 2004
- Lapuerta M. Armas O. Hernández J.J. “Diagnostic of DI Diesel Combustion from In-cylinder Pressure Signal by Estimation of Mean Thermodynamic Properties of the Gas” Applied Thermal Engineering 19 513 519 1999
- Rife, J. Heywood, J.B. “Photographic and Performance Studies of Diesel Combustion With a Rapid Compression Machine,” SAE Technical Paper 740948 1974
- Musculus, M.P.B. Kattke, K. “Entrainment Waves in Diesel Jets,” SAE Int. J. Engines 2 1 1170 1193 2009