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Multidimensional Optimization of In-Cylinder Tumble Motion for the New Chrysler Hemi
Technical Paper
2002-01-1732
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The current is an investigation of the effects of charge motion, namely tumble, on the burn characteristics of the new Chrysler Hemi SI engine. In order to reduce prototyping, several combustion system designs were evaluated; some of which were eliminated prior to design inception solely based on CFD simulations. The effects of piston top and number of spark plugs were studied throughout the conceptual stage with the AVL-FIRE CFD code. It has been concluded that large-scale, persistent and coherent tumbling flow structures are essential to charge motion augmentation at ignition only if such structures are decimated right before ignition. Piston top had a detrimental effect on tumbling charge motion as the piston approaches the TDC. When compared to single spark plug operation, dual spark plug reflected considerable improvement on burn characteristics and engine performance as a consequence. The CFD simulations demonstrated good correlation with early dynamometer data. Finally, given the complex characteristics of rotating intake flows, it is conceivable to design an optimum charge motion level pertinent to specific combustion system architecture.
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Amer, A. and Reddy, T., "Multidimensional Optimization of In-Cylinder Tumble Motion for the New Chrysler Hemi," SAE Technical Paper 2002-01-1732, 2002, https://doi.org/10.4271/2002-01-1732.Also In
References
- Floch Alain Van Frank Jean Ahmed Afif “Comparisons of the Effects of Intake-Generated Swirl and Tumble on Turbulence Characteristics in a 4-Valve Engine” SAE 952457
- Church William Farrell P.V. “Effects of Intake Port Geometry on Large Scale In-Cylinder Flows” SAE 980484
- Baby Xavier Floch Alain “Investigation of the In-Cylinder Tumble Motion in a Multi-Valve Engine: Effect of Piston Shape” SAE 971643
- Miller R. Newman C. Dai W. Trigui N. Davis G. Trumpy D. Glidewell J. “Up-Front Predictions of the Effects of Cylinder Head Design on Combustion Rates in SI Engines” SAE 981049
- Ando Hiromitsu “Combustion Control Technologies for Gasoline Engines” ImechE International Seminar on Lean Burn Engines
- Acroumanis, C. Godwin, S.N. Kim, J.W. “Effect of Tumble Strength on Combustion and Exhaust Emissions in a Single Cylinder, Four-Valve, Spark Ignition Engine” SAE 981044
- Neßuer Heinz-Jacob Geiger Jose' “Continuous Variable Tumble - A New Concept for Future Lean Burn Engines” FEV Tech Brief Dec 92 SAE 960607
- Endros, H. Neßuer, H. -J. Wurms, R. “Influence of Swirl and Tumble on Economy and Emissions of Multi Valve SI Engines” SAE 920516
- Omori, S. Iwachido, K. Motomochi, M. Hirako, O. “Effect of Intake Port Flow Pattern on the In-Cylinder Tumbling Air Flow in Multi-Valve SI Engines” SAE 910477
- Granter, M.H. Nsibet, M.J. Wolfgang Schwarz, M.W. “Three Dimensional Simulation of the Entire Engine Cycle in a Volvo SI Engine” SAE 963407
- Jackson, N.S. Stokes, J. Sadler, M. Heikal, M.R. Faure, M. Pommier, L. “Correlation of the Combustion Characteristics of Spark Ignition Engines with the In-Cylinder Flow Field Characterized using PIV in a Water Analogy Rig” SAE 971637
- Gosman, A.D. Tsui, Y.Y. Vafidis, C. “Flow in a Model Engine with a Shrouded Valve - A Combined Experimental and Computational Study” SAE 850498
- Kuo Tang-Wei “Multidimensional Port-and-Cylinder Gas Flow, Fuel Spray, and Combustion Calculations for a Port-Fuel-Injection Engine” SAE 920515
- Tatschl, R. Bogensperger, M. “Multidimensional Calculation of Inhomogeneous-Cahrge Combustion in a 4-Valve Gasoline Engine” KONES 94-International Scientific Conference of Combustion Engines September 7-10 1994 Lublin, Poland
- Luo, K.H. Bray, K.N.C. “3D Simulation of Induction Port Flow of a Four-Valve Engine Configuration” SAE 920515
- Khalighi Bahram Haworth Daniel C. Huebler Mark S. “Multidimensional Port-and-in-Cylinder Flow Calculations and Flow Visualization Study in an Internal Combustion Engine with Different Intake Configurations” SAE 941871
- Fletcher, C. A. J. “Computational Techniques for Fluid Dynamics” 2nd Springer Verlag 1997
- Anderson, J. D. “Computational Fluid Dynamics” McGraw Hill 1995
- AVL FIRE Manuals l3 1999
- Tatschl, R. Riediger, H. “PDF Modelling of Stratified Charge SI Engine Combusion” SAE 981464
- Tatschl, R. Fuchs, H. Brandstatter, W. “Experimentally Validated Multi-dimensional Simulation of Mixture Formation and Combustion in Gasoline Engines”
- Hill, P.G. Zhang, D. “The Effect of Swirl and Tumble on Combustion in Spark-Ignition Engines” Prog. Energy Combust. Sci. 20 373 429 1994
- Chandra, H. “A critical Study of the Dual Versus Single Plug Systems in S.I. Engines” SAE 940452