Studying the Influence of Direct Injection on PCCI Combustion and Emissions at Engine Idle Condition Using Two Dimensional CFD and Stochastic Reactor Model

Document Number: 2008-01-0021

Date Published: April 2008

Author(s):
Li Cao - Univ. of Cambridge
Amit Bhave - Reaction Engineering Solutions, Ltd.

Abstract:
A detailed chemical model was implemented in the KIVA-3V, two-dimensional CFD code to investigate the effects of the spray cone angle and injection timing on the PCCI combustion process and emissions in an optical research diesel engine. A detailed chemical model for Primary Reference Fuel (PRF) consisting of 157 species and 1552 reactions was used to simulate diesel fuel chemistry. The model validation shows good agreement between the predicted and measured pressure and emissions data in the selected cases with various spray angles and injection timings. If the injection is retarded to -50\mD ATDC, the spray impingement at the edge of the piston corner with 100\mD injection angle was shown to enhance the mixing of air and fuel. The minimum fuel loss and more widely distributed fuel vapor contribute to improving combustion efficiency and lowering uHC and CO emissions in the engine idle condition. Finally, the coupling of CFD and multi-zone Stochastic Reactor Model (SRM) was demonstrated to show improvement in CO and uHC emissions prediction.

File Size: 1659K
Product Status: In Stock

Included in: SP-2182

See other papers presented at SAE World Congress & Exhibition, April 2008, Detroit, MI, USA, Session: HCCI (Part 5 of 5)

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