Multidimensional Optimization of In-Cylinder Tumble Motion for the New Chrysler Hemi

2002-01-1732

05/06/2002

Event
Spring Fuels & Lubricants Meeting & Exhibition
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/2002-01-1732
Pages
13
Citation
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.
Additional Details
Publisher
Published
May 6, 2002
Product Code
2002-01-1732
Content Type
Technical Paper
Language
English