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Effects of Mixing on Early Injection Diesel Combustion
Technical Paper
2005-01-0154
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Ignition dwell is defined as the interval between end of fuel injection and start of combustion in early injection diesel combustion that exhibits HCCI-like characteristics. In this project, the impact of in-cylinder temperature and fuel-air mixing on the ignition dwell was investigated. The engine cycle was simulated using the 3-D CFD code KIVA-3V. Work done by Klingbeil (2002) has shown that ignition dwell allows more time for fuel and air to mix and drastically reduces emissions of NOX and particulate matter. Temperature is known to have a direct impact on the duration of ignition dwell. However, initial fuel-air distribution and mixing (i.e. at the end of fuel injection) may also impact the duration of ignition dwell. To investigate this, variations in EGR, fuel injection timing, engine valve actuation and swirl were simulated. The aim was to use these techniques to generate varying levels of fuel-air mixing and to check if ignition dwell was affected. In order to verify if fuel-air mixing had been affected by these techniques, the equivalence ratio and temperature distribution, intermediate species formation, mixing timescales and fuel vaporization were analyzed. The results showed that in-cylinder temperature distribution was primarily responsible for controlling duration of dwell. However, the initial fuel-air distribution also affected ignition dwell although to a smaller extent. It was also seen that methods that affected fuel-air distribution (in addition to just temperature), resulted in a more homogeneous mixture and potentially would allow for a faster response time. Overall, this study helped to evaluate the relative influence and importance of various mixing control strategies to achieve ignition control though increased dwell.
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Citation
Jhavar, R. and Rutland, C., "Effects of Mixing on Early Injection Diesel Combustion," SAE Technical Paper 2005-01-0154, 2005, https://doi.org/10.4271/2005-01-0154.Also In
Homogeneous Charge Compression Ignition (HCCI) Combustion 2005
Number: SP-1963; Published: 2005-04-11
Number: SP-1963; Published: 2005-04-11
Homogeneous Charge Compression Ignition (HCCI) Combustion on CD-ROM from the SAE 2005 World Congress
Number: SP-1982CD; Published: 2005-04-11
Number: SP-1982CD; Published: 2005-04-11
References
- Abraham J Bracco FV Reitz RD 1985 “Comparison of computed and measured premixed charged engine combustion” Combustion and Flame 60 1985
- Amsden AA 1997 “KIVA-3V: A block-structured KIVA program for engines with vertical or canted valves” Los Alamos National Laboratories 1997
- Benson RS et al. 1964 “A numerical solution of unsteady flow problems” Int. J. Mech. Sci 6 1
- Christensen M Johansson B Einewall P 1997 “Homogeneous charge compression ignition (HCCI) using isooctane, ethanol and natural gas - a comparison with spark ignition operation” SAE paper 972874
- Halstead MP Kirsch LJ Quinn CP 1997 “The autoignition of hydrocarbon fuels at high temperatures and pressures - fitting of a mathematical model” Combustion and Flame 30 45 60
- Han Z Reitz RD 1995 “Turbulence modeling of internal combustion engines using RNG k-e models” Combustion Science and Technology 106 267 295
- Kirkpatrick SJ Blair GP Fleck R McMullan RK 1994 “Experimental evaluation of 1-D computer codes for the simulation of unsteady gas flow through engines - a first phase” SAE paper 941685
- Klingbeil AE 2002 “Particulate and NOx reduction in a heavy-duty diesel engine using high levels of exhaust gas recirculation and very early or very late start of injection” University of Wisconsin Madison
- Klingbeil AE Juneja H Ra Y Reitz RD 2003 “Premixed diesel combustion analysis in a heavy-duty diesel engine” SAE paper 2003-01-0341
- Kong SC Reitz RD 1993 “Multidimensional modeling of diesel ignition and combustion using a multistep kinetics model” Journal of Engineering for Gas Turbines and Power 115 781 789
- Kong SC Han Z Reitz RD 1995 “The development and application of a diesel engine and combustion model for multidimensional engine simulation SAE paper 950278
- Miyamoto T Hayashi AK Harada A Sasaki S Akagawa H Tsujimura K 1998 “Numerical simulation of premixed lean diesel combustion in a DI engine” Proceeding of the Fourth International Symposium COMODIA 98 179 184
- Patterson MA Reitz RD 1998 “Modeling the effects of fuel spray characteristics on diesel engine combustion and emissions” SAE paper 980131
- Reitz RD Rutland CJ 1995 “Development and testing of diesel engine CFD models” Prog. Energy Combust. Sci. 21 173 196
- Richards, K. 2001 2002 Personal Communication
- Rutland CJ Ayoub N Han Z Hampson G Kong SC Mather D Musculus M Patterson M Ricart L Stephenson P Reitz RD 1995 “Progress towards diesel combustion modeling” SAE paper 952429
- Ryan TW III Callahan TJ 1996 “Homogeneous charge compression ignition of diesel fuel” SAE paper 961160
- Sjoberg M Edling LO Eliassen T Magnusson L Angstrom HE 2002 “GDI HCCI: Effects of injection timing and air swirl of fuel stratification, combustion and emissions formation” SAE paper 2002-01-0106
- Xu H Fu H Williams H Shilling I 2002 “Modeling study of combustion and gas exchange in a HCCI (CAI) engine” SAE paper 2002-01-0114
- Yakhot V Orszag SA 1986 “Renormalized group analysis of turbulence. I. Basic theory” Journal of Scientific Computing 1
- Zhu Y Reitz RD 1999 “A 1-D gas dynamics code for subsonic and supersonic flows applied to predict EGR levels in a heavy-duty diesel engine” Int. J. of Vehicle Design 22 3 4 227 252