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Concept for Modeling and Optimization of the Mixture Formation Using Gasoline Direct Injection in Compact High Speed Engines
Technical Paper
1999-01-2935
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The paper presents a concept for modeling and optimization of the mixture formation process during gasoline direct injection, using a high-pressure single fluid injection system which allows the modulation of the injection rate independently on the engine speed. Going from this favorable premise for the adaptation of the mixture formation to various load and speed conditions, the aim of modeling is to find the optimum combination between the adaptable elements as follows: form of the fuel pressure wave, injection timing, spray form, injector location, form of the combustion chamber. Moreover, the interaction between fuel and air flow within the cylinder during the mixture formation is considered as a determining factor for the combustion process, and forms thereby an important part of the modeling. Considering the most advanced GDI strategy, which consists in two stage control of mixture formation - at high load, respectively at low load - the paper is focused on the mixture stratification process at low load as extremely sensible problem. The model was generated using the commercial code FLUENT. Different combinations of injected fuel quantity, injection start, engine speed as well as the interaction between fuel and air flow will be presented as time and space related sequences of fuel distribution and velocity within the combustion chamber. The program validation by spray visualization for distinct cases gives the possibility to calibrate the model, for the reliable simulation of a great number of parameter combinations, the extreme configurations being tested on the bench.
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Stan, C., Eichert, H., Tröger, R., Martorano, L. et al., "Concept for Modeling and Optimization of the Mixture Formation Using Gasoline Direct Injection in Compact High Speed Engines," SAE Technical Paper 1999-01-2935, 1999, https://doi.org/10.4271/1999-01-2935.Also In
References
- Stan C. et al. Direct Injection Systems for Spark Ignition and Compression Ignition Engines” Springer Verlag Berlin Heidelberg New York 1999 3-540-65287-6
- Lefebvre A.H. “Atomization and Sprays” Hemisphere Publishing Corporation 1996
- A.A.V.V. “Direct Injection SI Engine Technology” SAE Publication Series SP-1314 1998
- Zhao F.Q. Lai M.C. Harrington D.L. “A Review of Mixture Preparation and Combustion Control Strategies for Spark-Ignited Direct-Injection Gasoline Engines” SAE Paper 970627
- Stan C. Eichert H. Martorano L Franco A. “Fluid Dynamic Modeling of Gasoline Direct Injection for Compact Combustion Chambers” SAE Paper 980755
- Ohsuga M. Shiraishi T. Nogi T. Nakayama Y. Sukegawa Y. “Mixture Preparation for Direct-Injection SI Engines” SAE Paper 970542
- Tomoda T. Sasaki S. Sawada D. Saito A. Sami H. “Development of Direct Injection Gasoline Engine- Study of Stratified Mixture Formation” SAE Paper 970539
- Harada J. Tomita T. Mizuno H. Mashiki Z. Ito Y. “Development of Direct Injection Gasoline Engine” SAE Paper 970540
- Jackson N.S. Stokes J. Whitaker P.A: Lake T.H. “Stratified and Homogeneous Charge Operation for the Direct Injection Gasoline Engine - High Power with Low Fuel Consumption and Emissions” SAE Paper 970543
- Fraidl G.K. Piock W.F. Wirth M. “Gasoline Direct Injection: Actual Trends and Future Strategies for Injection and Combustion System” SAE Paper 960465
- Dodge L.G. “Fuel Preparation Requirements for Direct-Injected Spark Ignition Engines” SAE Paper 962015
- Iwamoto Y. Noma K. Nakayama O. Yamauchi T. Ando H. “Development of Direct Injection Gasoline Engine” SAE Paper 970541
- Stan C. “Experimental Analysis of the Fuel Spray Characteristics for DI High Speed Engines Using a Ram Tuned Injection System” SAE Paper 972742
- Carson C. E. Kee R.J. Kenny R.G. Stan C. Lehmann K. Zwahr S. “Ram Tuned and Air Assisted Direct Fuel Injection System Applied to a SI Two-Stroke Engine” SAE Paper 950270
- Franco A. Martorano L. Stan C. Eichert H, “Numerical Analysis of the Performances of a Small Two-Stroke Engine with Direct Injection” SAE Paper 960362
- FLUENT Program Code, User's Guide Version 4.42 FLUENT Incorporated Lebanon USA 1996
- Hirt C.W. Nichols B.D. “Volume of Fluid (VOF) Method for the Dynamics of Free Boundaries” Journal of Computational Physics 39 201 225 1981