This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Dynamic simulation to analyze the influence of VVT strategies on the fuel spray and flow characteristics in an internal combustion engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 03, 2018 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
A CFD three-dimensional analysis of an internal combustion engine was carried out to evaluate the gasoline-ethanol E27 fuel spray and flow characteristics using variable valve timing (VVT) technology. In this study, the fuel injection has been made using port fuel injection (PFI) and the simulations modeled two conditions of valve timing: baseline and retarding the intake valve opening (IVO) 40°. The dynamic performance of this numerical model was validated comparing simulation results of cylinder pressure, mass burned fraction, cylinder temperature, and heat release with experimental data. The effects of in-cylinder fluid flow patterns, such as tumble and swirl, on combustion were numerically investigated for the two studied conditions and it was verified an extreme reduction of swirl when IVO is retarded, besides differences in tumble and cross-tumble. It was also observed major alterations on spray behavior using a retarded IVO, mostly in velocities, atomization, and remaining fuel in the admission port. Effects of exhaust gas recirculation (EGR) were also evaluated and proved to be more significant in the baseline condition.
- Fábio de Castro Radicchi - Programa de Pós-Graduação em Engenharia Mecânica da UFMG (PP
- Deborah Domingos da Rocha - Programa de Pós-Graduação em Engenharia Mecânica da UFMG (PP
- Erwin K. Franieck - Programa de Pós-Graduação em Engenharia Mecânica da UFMG (PP
- Fabrício Pujatti - Programa de Pós-Graduação em Engenharia Mecânica da UFMG (PP
- Rafael Lara Franco - Robert Bosch Ltda.
- Gustavo Santos Lopes - Robert Bosch Ltda.
Citationde Castro Radicchi, F., da Rocha, D., Franieck, E., Pujatti, F. et al., "Dynamic simulation to analyze the influence of VVT strategies on the fuel spray and flow characteristics in an internal combustion engine," SAE Technical Paper 2018-36-0250, 2018, https://doi.org/10.4271/2018-36-0250.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
|[Unnamed Dataset 2]|
|[Unnamed Dataset 3]|
|[Unnamed Dataset 4]|
- MA, T. Recent advances in variable valve timing. In: Automotive Engine Alternatives. [S.l.]: Springer, 1987. p. 235–252.
- Fontana, G., and E. Galloni. “Variable valve timing for fuel economy improvement in a small spark-ignition engine.” Applied Energy 86.1 (2009): 96–105.
- Sher, E., and T. Bar-Kohany. “Optimization of variable valve timing for maximizing performance of an unthrottled SI engine—a theoretical study.” Energy 27.8 (2002): 757–775.
- Li, Tie, et al. “The Miller cycle effects on improvement of fuel economy in a highly boosted, high compression ratio, direct-injection gasoline engine: EIVC vs. LIVC.” Energy Conversion and Management 79 (2014): 59–65.
- Martins, Mario ES, and Thompson DM Lanzanova. “Full-load Miller cycle with ethanol and EGR: Potential benefits and challenges.” Applied Thermal Engineering 90 (2015): 274–285.
- Murata, Yutaka, et al. “Miller-PCCI combustion in an HSDI diesel engine with VVT.” SAE International Journal of Engines 1.1 (2009): 444–456.
- Hara, Seinosuke, et al. “Variable valve actuation systems for environmentally friendly engines.” Hitachi Review 58.7 (2009): 319–324.
- Béard, P., Colin, O. and Miche, M., “Improved Modelling of DI Diesel Engines Using Sub-grid Descriptions of Spray and Combustion”, SAE Paper 2003-01-0008, 2003.
- O. Colin, A. Benkenida, “3-Zones Extended Coherent Flame Model (ECFM3Z) for Computing Premixed/Diffusion Combustion”, Oil & Gas Science and Technology - Rev. IFP vol. 59, issue 6, p. 593–609 , 2004.
- Yakhot, V.; Orszag, S.A.; Thangam, S.; Gatski, T.B.; Speziale, C.G., “Development Of Turbulence Models For Shear Flows By A Double Expansion Technique”, Physics of Fluids A, v. 4, n. 7, p. 1510–1520, 1992.