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Available Strategies for Improving the Efficiency of DI Diesel Engines-A Theoretical Investigation
Technical Paper
2000-01-1176
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2000 World Congress
Language:
English
Abstract
The Diesel engine and especially the direct injection type one is considered to be one of the most efficient thermal engines known to man up to now. It has an efficiency that in some cases is 30 to 40% higher than its competitor the spark ignition engine. The efficiency of the direct injection diesel engine has been considerably improved during the last decade resulting to low fuel consumption and lower absolute values of pollutant emissions. If we consider the green house effect caused by the emitted CO2 it is revealed the environmental importance of high engine efficiency. In the present work a theoretical investigation is conducted using a detailed simulation model for engine performance prediction, to examine the possibilities for improving engine efficiency. The simulation model used is a complete open cycle model for the engine and its subsystems. Such phenomenological models are very suitable for the prediction of engine performance. If we examine the brake efficiency of an engine we observe that it depends mainly on two parameters, the efficiency of the thermodynamic cycle on which the engine is based and on the mechanical efficiency which reveals the amount of energy lost in the various mechanical components and subsystems of the engine. For this reason it is obvious that two are the main options for increasing engine efficiency, increase of the indicated efficiency or/and the mechanical efficiency. As a basis for the present investigation is used a heavy-duty six cylinder production DI turbocharged diesel engine. Using the simulation model we have determined that mainly increasing the injection timing or the intensity of combustion may increase the indicated efficiency. As far as mechanical efficiency is concerned it appears that the only solution for a serious improvement is to increase the power concentration of the engine. The last simply means to burn more fuel, which requires excess air and thus high turbocharging. Using the simulation model we have determined the effect of all previous parameters on engine efficiency and have determined limits as far as possible increase of efficiency is concerned. Furthermore we have determined the effect of these actions on the engine and mainly on its maximum combustion pressure. Using these results conclusions are derived concerning the ability we have to increase engine efficiency and the penalty we have to pay in these cases. Of course it remains to investigate the impact of these measures on pollutant emissions. This is currently under investigation and results will be available in the near future.
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Citation
Hountalas, D., "Available Strategies for Improving the Efficiency of DI Diesel Engines-A Theoretical Investigation," SAE Technical Paper 2000-01-1176, 2000, https://doi.org/10.4271/2000-01-1176.Also In
References
- Benson, R.S Whitehouse, N.D. Internal Combustion Engines Pergamon Oxford 1979
- Heywood, J.B. Internal Combustion Engine Fundamentals McGraw-Hill New York 1988
- Ramos, J.I. Internal Combustion Engine Modelling Hemisphere New York 1989
- Kouremenos, D.A. Rakopoulos, C.D. Hountalas, D.T. “Thermodynamic analysis of indirect injection diesel engines by two-zone modeling of combustion” Trans. ASME, J. Engng for Gas Turbines and Power 112 138 149 1990
- Kouremenos, D.A. Hountalas, D.T. Kotsiopoulos, P.N. “Computer simulation of turbocharged marine diesel engines and its application for engine and turbocharger diagnosis” 5th Intern. Conf. on “Turbocharging and Turbochargers” Inst. Mech. Engrs 13 20 London 1994
- Hountalas D.T. “The effect of operating parameters on the net and gross heat release rates of a direct injection diesel engine” Proc. 2nd Biennial ASME-ESDA Intern. Conf., Design of Energy Systems London 1994
- Kouremenos, D.A. Rakopoulos, C.D. Hountalas, D.T. “Multi-zone combustion modelling for the prediction of pollutants emissions and performance of DI diesel engines” SAE Transactions , Paper No 970635 1997
- Rakopoulos, C.D. Hountalas, D.T. “Development and validation of a 3-D multi-zone combustion model for the prediction of a DI diesel engine performance and pollutants emissions” SAE Transactions , No. 981021 1998
- Austen, A.E. Lyn, W.T. “Relation between fuel injection and heat release in a direct injection engine and the nature of the combustion processes” Proc. Inst. Mech. Engrs (AD) 1 47 62 1960-61
- Benson, R.S. Baruah, P.C. “Some further tests on a computer program to simulate internal combustion engines” SAE paper No 730667 1973
- Watson N. Janota M.S. Turbocharging the Internal Combustion Engine MacMillan Press London 1982
- Hountalas D.T. Kouremenos A.D. “Development and application of a fully automatic troubleshooting method for large marine diesel engines” Applied Thermal Engineering 19 299 324 1999
- Rakopoulos, C.D. Giakoumis, E.G. Hountalas, D.T. “A simulation analysis of the effect of governor technical characteristics and type on the transient performance of a naturally aspirated IDI diesel engine” SAE Transactions , No 970633 1997
- Launder, B.E. Spalding, D.B. Mathematical Models of Turbulence Academic Press London & New York 1972
- Kamel, M. Watson, N. “Heat transfer in the indirect injection diesel engine” SAE paper No 790826 1979
- Annand, W.J.D. “Heat transfer in the cylinders of reciprocating internal combustion engines” Proc. Inst. Mech. Engrs 177 973 990 1963
- Hountalas, D.T. “The effect of operating parameters on the net and gross heat release rates of a direct injection diesel engine” Proc. 2nd Biennial ASME-ESDA Intern. Conf. on “Design of Energy Systems” 64-3 27 34 London 1994
- Rakopoulos, C.D. Hountalas, D.T. Mavropoulos, G.C. Giakoumis, E.G. “An integrated transient analysis simulation model applied in thermal loading calculations of an air-cooled diesel engine under variable speed and load conditions” SAE Transactions , No 970634 1997
- Kouremenos, D.A. Rakopoulos, C.D Kotsos, K.G. Hountalas, D.T. “Modelling the blowby rate in a reciprocating internal combustion engine” Proc. 16th IASTED IMS Int. Conf. Paris June 22-24 465 468 1987
- Williams, T.J. “Parameters for correlation of penetration results for diesel fuel sprays” Proc. Inst. Mech. Engrs 187 771 774 1973
- Chiu, W.S. Shahed, S.M. Lyn, W.T. “A transient spray mixing model for diesel combustion” SAE paper No 760128 1976
- Glauert, M.B. “The wall jet” J.Fluid Mech. 1 625 643 1956
- Dent, J.C. Derham, J.A. “Air motion in a four-stroke direct injection diesel engine” Proc. Inst. Mech. Engrs 188 269 280 1974
- Willis, D.A. Mayer, W.E. Birnie, C. “Mapping of airflow patterns in engines with induction swirl” SAE paper No 660093 1966
- Kouremenos, D.A. Rakopoulos, C.D. Yfantis, E.A. “A fortran program for calculating the evaporation rates in diesel engine fuel sprays” Advances in Engng Software 15 67 71 1992
- Borman, G.L. Johnson, J.H. “Unsteady vaporisation histories and trajectories of fuel drops injected into swirling air” SAE Paper No 598C National Powerplant Meeting Philadelphia PA 1962
- Hiroyasu, H. Kadota, T. Arai, M. “Development and use of a spray combustion modelling to predict diesel engine efficiency and pollutant emissions” Bulletin JSME 26 569 576 1983
- Kadota, T. Hiroyasu, H. Oya, H. “Spontaneous ignition delay of a fuel droplet in high pressure and high temperature gaseous environments” Bulletin JSME 19 130 1976
- Hountalas, D.T. Kouremenos, A.D. “Development of a fast and simple simulation model for the fuel injection system of diesel engines” Advances in Engng Software 29 13 28 1997
- Kouremenos, D.A. Rakopoulos, C.D. Hountalas, D.T. Kotsiopoulos, P.N. “A simulation technique for the fuel injection system of diesel engines” ASME-WA meeting Atlanta GA Proc. AES 24 91 102 1991
- Beck, J.V. Arnold, K.J. Parameter Estimation in Engineering and Science John Wiley & Sons New York 1977
- Sage A.R. Melsa, J.L. System Identification Academic Press New York 1971