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Steady and Transient Fluid Dynamic Analysis of the Tumble and Swirl Evolution on a 4V Engine with Independent Intake Valves Actuation
Technical Paper
2008-01-2392
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This work aims at analyzing the fluid dynamic characteristics of a Ducati 4 valves SI engine, for racing motorcycle, during the intake and compression strokes, focusing on the correlation between steady state flow test data (experiments and simulations) and transient CFD simulation results, including the effect of variable valve actuation strategies with independent intake valve actuation.
Several steady state flow test data were available in terms of maps of the discharge, tumble and swirl coefficients, at any combination of asymmetric lifts of the two intake valves. From these steady state data it can be argued that asymmetric strategies could enhance engine full load and part load operation characteristics, by exploiting favourable trade off occurring between the opposing needs for high mass flow rate and high charge motion intensity. For a given mass flow rate, enhanced tumble or swirl intensities can be reached using asymmetrical lifts, compared to the standard symmetrical 2V lift.
Numerical simulations allowed a deeper understanding of the tumble/swirl motion characteristics at different lift combinations, especially for asymmetric low lift cases. Analyzing the transient CFD results the instantaneous values of discharge and tumble/swirl coefficients can be determined and compared to steady state data. The further aim of the present research line is to investigate the influence of the lift strategies on the evolution of the charge motion.
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Battistoni, M., Cancellieri, A., and Mariani, F., "Steady and Transient Fluid Dynamic Analysis of the Tumble and Swirl Evolution on a 4V Engine with Independent Intake Valves Actuation," SAE Technical Paper 2008-01-2392, 2008, https://doi.org/10.4271/2008-01-2392.Data Sets - Support Documents
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| Unnamed Dataset 1 |
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References
- Arcoumanis, C. Hu, Z. Whitelaw, J. H. ‘Steady flow characterization of tumble-generating four-valve cylinder heads’ Proc. Inst. Mech. Eng. 207 203 210 1993
- Heywood, J. B. “Internal Combustion Engine Fundamentals” McGraw Hill Book Company New York 1998
- Gosman, A. D. Tsui, Y. Y. Vafidis, C. ‘Flow in a Model Engine with a Shrouded Valve - a Combined Experimental and Computational Study’ SAE paper 850498 1985
- Arcoumanis, C. Hu, Z. Vafidis, C. Whitelaw, J. H. ‘Tumbling Motion: a mechanism for turbulence enhancement in spark-igniton engines’ SAE paper 900060 1990
- Hadded, O. Denbratt, I. ‘Turbulence Characteristics of Tumbling air Motion in Four-Valve S.I. Engines and their Correlation with Combustion Parameters’ SAE paper 910478 1991
- Kern, Y. K. Seung M. O. Jin W. L. ‘The Effects of Tumble Flow on Lean Burn Characteristics in a Four-Valve SI Engine’ SAE paper 970791 1997
- Grimaldi, C. N. Carducci, F. Postrioti, L. Bella, G. Rotondi, R. Vignaroli, G. “Dependence of High Performance Engine Modeling on Discharge Coefficient” High Tech Engines and Cars, 7 th International Congress May 2001 Modena, Italy Proceedings on CD-ROM
- Postrioti, L. ‘Experimental Characterization of Discharge Coefficient and Tumble Motion in a Competition Engine Intake System’ High Tech Engines and Cars, 8 th International Congress May 2002 Modena, Italy Proceedings on CD-ROM
- Grimaldi, C. N. Battistoni, M. Postrioti, L. ‘Flow Characterization of a High Performance S.I. Engine Intake System - Part 1: Experimental Analysis’ SAE Technical Paper Series No. 2003-01-0623 2003
- Bella, G. De Maio, A. Grimaldi, C. N. “Flow Characterization of a High Performance S.I. Engine Intake System. Part 2: Numerical Analysis” 2003 SAE World Congress March 2003 Detroit, MI SAE Paper 2003-01-0632 2003
- Grimaldi, C. N. Battistoni, M. Uccellani, M. ‘Dependence of Flow Characteristics of a High Performance S.I. Engine Intake System on Test Pressure and Tumble Generation Conditions - Part 1: Experimental Analysis’ SAE Technical Paper Series No. 2004-01-1530 2004
- Mariani F. Cavalletti M. ‘Dependence of Flow Characteristics of a High Performance S.I. Engine Intake System on Test Pressure and Tumble Generation Conditions - Part 2: Numerical Analysis’ SAE Technical Paper Series No. 2004-01-1531 2004
- Grimaldi C. N. Battistoni M. “Experimental Analysis of the Tumble Generation Process in the Intake System of a 4-Valve SI Engine” 10 th International Conference High Tech Engines and Cars May 2004 Modena, Italy proceedings on CD-ROM
- Grimaldi, C. N. Battistoni, M. Mariani, F. ‘Experimental and Numerical Analysis of Charge Motion Characteristics Depending on Intake Valves Actuation Strategies’ SAE Technical Paper Series No. 2005-01-0242 2005