Applications of CFD Modeling in GDI Engine Piston Optimization

Event
Powertrains, Fuels and Lubricants Meeting
Authors Abstract
Content
This paper describes a CFD modeling based approach to address design challenges in GDI (gasoline direct injection) engine combustion system development. A Ford in-house developed CFD code MESIM (Multi-dimensional Engine Simulation) was applied to the study. Gasoline fuel is multi-component in nature and behaves very differently from the single component fuel representation under various operating conditions. A multi-component fuel model has been developed and is incorporated in MESIM code. To apply the model in engine simulations, a multi-component fuel recipe that represents the vaporization characteristics of gasoline is also developed using a numerical model that simulates the ASTM D86 fuel distillation experimental procedure. The effect of the multi-component model on the fuel air mixture preparations under different engine conditions is investigated. The modeling approach is applied to guide the GDI engine piston designs. Effects of piston designs on the fuel air mixture preparation are presented. It is found that the multi-component fuel model is critical to the accuracy of the model prediction of the fuel air preparation process, particularly under cold start conditions.
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DOI
https://doi.org/10.4271/2009-01-1936
Pages
15
Citation
Xu, Z., Yi, J., Curtis, E., and Wooldridge, S., "Applications of CFD Modeling in GDI Engine Piston Optimization," SAE Int. J. Engines 2(1):1749-1763, 2009, https://doi.org/10.4271/2009-01-1936.
Additional Details
Publisher
Published
Jun 15, 2009
Product Code
2009-01-1936
Content Type
Journal Article
Language
English