Applications of CFD Modeling in GDI Engine Piston Optimization

Document Number: 2009-01-1936

Date Published: June 2009

Author(s):
Zheng Xu - Ford Motor Co.
Jianwen Yi - Ford Motor Co.
Eric Curtis - Ford Motor Co.
Steven Wooldridge - Ford Motor Co.

Abstract:
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 (Multidimensional 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.

File Size: 3196K
Product Status: In Stock

Included in: V118-3

See other papers presented at Powertrains, Fuels and Lubricants Meeting, June 2009, Florence, ITALY, Session: Multi-Dimensional Modeling (Part 2 of 2)

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