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An Approach for Modeling the Effects of Gas Exchange Processes on HCCI Combustion and Its Application in Evaluating Variable Valve Timing Control Strategies
Technical Paper
2002-01-2829
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The present study introduces a modeling approach for investigating the effects of valve events and gas exchange processes in the framework of a full-cycle HCCI engine simulation. A multi-dimensional fluid mechanics code, KIVA-3V, is used to simulate exhaust, intake and compression up to a transition point, before which chemical reactions become important. The results are then used to initialize the zones of a multi-zone, thermo-kinetic code, which computes the combustion event and part of the expansion. After the description and the validation of the model against experimental data, the application of the method is illustrated in the context of variable valve actuation. It has been shown that early exhaust valve closing, accompanied by late intake valve opening, has the potential to provide effective control of HCCI combustion. With appropriate extensions, the present modeling approach can account for mixture inhomegeneities in both temperature and composition, resulting from gas exchange, heat transfer and insufficient mixing.
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Babajimopoulos, A., Assanis, D., and Fiveland, S., "An Approach for Modeling the Effects of Gas Exchange Processes on HCCI Combustion and Its Application in Evaluating Variable Valve Timing Control Strategies," SAE Technical Paper 2002-01-2829, 2002, https://doi.org/10.4271/2002-01-2829.Also In
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