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Development and Validation of a Detailed Fuel Injection System Simulation Model for Diesel Engines
Technical Paper
1999-01-0527
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The fuel injection system of diesel engines is of great importance since it controls the combustion mechanism. The rate of injection and the speed of injected fuel are important parameters for engine operation, controlling the combustion and pollutants formation mechanisms. A fuel injection system simulation capable of predicting the performance of the injection system to a good degree of accuracy has been developed. The simulation is based on a detailed geometrical description of the injection system and in modeling each subsystem as a separate control volume. The simulation starts at the driving mechanism of the fuel pump and describes all parts of the system pump chamber, delivery valve, delivery chamber, connecting pipe and injector. The components of the system are put together and interact as they do in reality. From the cam geometry an analytical expression is derived that gives the pump piston lift as a function of the engine crank angle. The equations of continuity and momentum are solved using the method of characteristics inside the pump chamber using a constantly moving mesh with boundary conditions derived from the motion of the plunger, while up to now most researchers considered the pressure inside the pump chamber uniform. The delivery valve and injector needle movement is obtained using Newton's second law by taking into consideration the various forces acting upon them. A second set of characteristics is used to solve the unsteady flow inside the delivery valve chamber and the connecting pipe. The fuel is considered to be compressible at every point of the injection system except from the injector needle seat and the resulting system of the two equations (continuity and momentum) is solved for speed and pressure. The prediction of the pressure-time diagram at any point of the injection system is possible. For the validation of the model, experimental data have been taken from a diesel engine operating at various speeds and loads. The fuel pressure in the line between the pump and injector has been recorded using a pressure transducer and a digital computer at a rate of 5 points per degree of crank angle and compared to the one predicted by the model. A good match between predicted and experimental pressure traces has been obtained revealing the predictive ability of the simulation model.
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Kouremenos, D., Hountalas, D., and Kouremenos, A., "Development and Validation of a Detailed Fuel Injection System Simulation Model for Diesel Engines," SAE Technical Paper 1999-01-0527, 1999, https://doi.org/10.4271/1999-01-0527.Also In
References
- Patterson, D.J. Henein, N.A. “Emissions from Combustion Engines and their Control” Ann Arbor Science Ann Arbor 1972
- Obert, E.F. Internal Combustion Engines-Air Pollution Intext New York 1973
- Benson R.S. Whitehouse, N.D. Internal Combustion Engines Pergamon Press Oxford 1979
- Ferguson, C.R. Internal Combustion Engines Wiley New York 1986
- Heywood, J.B. Internal Combustion Engine Fundamentals McGraw-Hill New York 1988
- Needham, J.R. Doyle, D.M. Faulkner, S.A. Freeman, H.D. “Technology for 1994” SAE Paper No 891949 1989
- Stevens, J.L. Taylor, A.J.F. “The design and development of a new range of small industrial diesel engines” SAE Paper 901569 1990
- Kouremenos, D.A. Rakopoulos, C.D. Yfantis, E.A. Hountalas, D.T. “An experimental investigation of fuel injection pressure and engine-speed effects on the performance and emission characteristics of a divided-chamber diesel engine” Energy Res. 17 315 326 1993
- Kouremenos, D.A Rakopoulos, C.D. Hountalas, D.T. Kotsiopoulos, P.N. “A Simulation technique for the fuel injection system of diesel engines” Proc. ASME-WA Meeting Atlanta, Georgia AES 91 102 1991
- De Juhasz, K.J. “Phenomena in linear flow” J. Franklin Inst. 233 1937
- Giffen, E. Rowe, W “Pressure calculations for oil engine fuel-injection systems” Proc. Instn. Mech. Engrs 141 519 1939
- Knight, B.E. “Fuel injection system calculations” Proc. Inst. Mech. Engrs (A.D.) 1 1960-61
- Brown, G.W. McCallion, H. “Simulation of an injection system with delivery pipe cavitation using a digital computer” Proc. Instn. Mech. Engrs 182 206 1967-68
- Wylie, E.B. Bolt, J.A. El-Erian, M.F. “Diesel fuel injection system simulation and experimental correlation” SAE Paper 710569 1976
- Matsuoka, S. Yokota, K. Kamimoto, T. Igoshi, M. “A study of fuel injection systems in diesel engines” SAE Paper 760550 1976
- Matsuoka, S. Yokota, K. Kamimoto, T. Igoshi, M. “A study of fuel injection systems in diesel engines” SAE Paper 760551 1976
- Streeter, V.L Wylie, E.B. Fluid Mechanics McGraw-Hill New York 1979
- Hountalas, D.T. Kouremenos, A.D. “Development of a fast and Simple Simulation Model For the Fuel Injection System of Diesel Engines” Advances in Engineering Software Esevier Science Ltd. 29 13 28 1998