This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Effect of Fuel Injection Pressure on Mixture Stratification in a GDI Engine - A CFD Analysis
Technical Paper
2017-01-2317
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
The mixture formation in gasoline direct injection (GDI) engines operating at stratified condition plays an important role in deciding the combustion, performance and emission characteristics of the engine. In a wall-guided GDI engine, piston profile is such that the injected fuel is directed towards the spark plug to form a combustible mixture at the time of ignition. In these engines, fuel injection pressure and timing play an important role in creating a combustible mixture near the spark plug. Therefore, in this study, an attempt has been made to understand the effect of fuel injection pressure with single and split injection strategy on the mixture formation in a four-stroke, wall-guided GDI engine operating under stratified conditions by using computational fluid dynamics (CFD) analysis. Four fuel injection pressures viz., 90, 120, 150 and 180 bar are considered for the analysis. All the CFD simulations are carried out at the engine speed of 2000 rev/min., compression ratio of 11.5, with the overall equivalence ratio of about 0.65. The fuel injection and spark timings are maintained at 605 and 705 CADs respectively.
In this study, the effect of fuel injection pressure on mixture stratification is carried out by a new parameter called “Stratification Index”. It is found that, at the time of the spark, with single fuel injection, with the fuel injection pressure of 180 bar, proper mixture stratification is produced. But, with split injection mode, at all the fuel injection pressures considered, a nearly homogeneous mixture is produced. Also in the single fuel injection cases, with the fuel injection pressures of 120, 150 and 180 bar, the peak in-cylinder pressures are higher by about 4.6, 14.9 and 19.6%; and 1.5, 3.7 and 4.3% respectively, compared to that of 90 bar fuel injection pressure.
Authors
Citation
Saw, O., Karaya, Y., and Mallikarjuna, J., "Effect of Fuel Injection Pressure on Mixture Stratification in a GDI Engine - A CFD Analysis," SAE Technical Paper 2017-01-2317, 2017, https://doi.org/10.4271/2017-01-2317.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 | ||
Unnamed Dataset 3 | ||
Unnamed Dataset 4 | ||
Unnamed Dataset 5 | ||
Unnamed Dataset 6 | ||
Unnamed Dataset 7 |
Also In
References
- Krishna , A.S. , Mallikarjuna , J.M. and Kumar , D. Effect of engine parameters on in-cylinder flows in a two-stroke gasoline direct injection engine Applied Energy 10.1016/j.apenergy.2016.05.067
- Zhao F. Q. , Lai M. C. , and Harrington D. L. Automotive Spark Ignited Direct-Injection Gasoline Engines Progress in Energy and Combustion Science 25 437 562 1999
- Addepalli , K. and Mallikarjuna , J. Effect of Engine Parameters on Mixture Stratification in a Wall-Guided GDI Engine - A Quantitative CFD Analysis SAE Int. J. Commer. Veh. 10 2 2017 10.4271/2017-01-0570
- Krishna , A.S. and Mallikarjuna , J. M. Parametric analysis of a 4-stroke GDI engine using CFD Alexandria Engineering Journal 10.1016/j.aej.2016.10.007
- Costa , M. , Sorge U. and Allocca L. Numerical study of the mixture formation process in a four-stroke GDI engine for two-wheel applications Simulation Modelling Practice and Theory 19 2011 1212 1226 2011
- Tian , J. , Long , W. , Fu , L. , Du , B. et al. Numerical simulation on multi-injection nozzle applied to Ignition Chamber GDI engine SAE Technical Paper 2007-01-1910 2007 10.4271/2007-01-1910
- Lienemann , H. and Shrimpton , J. In-Cylinder Tumble Flow Characteristics and Implications for Fuel/Air Mixing in Direct Injection Gasoline Engines SAE Technical Paper 2003-01-3104 2003 10.4271/2003-01-3104
- Bontorin , A. and de Oliveira Carvalho , L. Investigation of the Impact of Lean Mixtures on the Performance of GDI Engines SAE Technical Paper 2016-36-0326 2016 10.4271/2016-36-0326
- Suh , E. and Rutland , C. Numerical Study of Fuel/Air Mixture Preparation in a GDI Engine SAE Technical Paper 1999-01-3657 1999 10.4271/1999-01-3657
- Sementa , P. , Vaglieco , B. , and Catapano , F. Influence of the Injection Pressure on the Combustion Performance and Emissions of Small GDI Engine Fuelled with Bio-Ethanol SAE Technical Paper 2011-37-0007 2011 10.4271/2011-37-0007
- Costa , M. , Marchitto , L. , Merola , S.S. , and Sorge , U. Study of mixture formation and early flame development in a research GDI engine through numerical simulation and UV-digital imaging Energy 77 2014 88 96
- Su , J. , Xu M. , Li T. , Gao Y. and Wang J. 2013 Combined effects of cooled EGR and a higher geometric compression ratio on thermal efficiency improvement of a downsized boosted spark-ignition direct injection engine Energy Conversion and Management 78 2014 65 73
- Kim , M. and Ohm , I. The Effect of Intake Valve Angle on In-cylinder Flow during Intake and Compression Process SAE Technical Paper 2007-01-4045 2007 10.4271/2007-01-4045
- Krishna , A. , Mallikarjuna , J. , Davinder , K. , and Ramachandra Babu , Y. In-Cylinder Flow Analysis in a Two-Stroke Engine - A Comparison of Different Turbulence Models Using CFD SAE Technical Paper 2013-01-1085 2013 10.4271/2013-01-1085
- CONVERGE v2.2.0 Theory Manual Convergent Science Inc. 2015
- Givler , S. , Raju , M. , Pomraning , E. , Senecal , P. et al. Gasoline Combustion Modeling of Direct and Port-Fuel Injected Engines using a Reduced Chemical Mechanism SAE Technical Paper 2013-01-1098 2013 10.4271/2013-01-1098
- Sagayaraj , A. R. G. , Mallikarjuna , J. M. and Ganesan , V. Energy efficient piston configuration for effective air motion - A CFD study Applied Energy 102 2013 347 354
- Krishna , A. , Saw , O. , and Mallikarjuna , J. Effect of Mixture Distribution on Combustion and Emission Characteristics in a GDI Engine - A CFD Analysis SAE Technical Paper 2017-24-0036 2017
- PTC CREO 2.0 Theory Manual Parametric Technology Corporation (PTC) 2012