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Decreasing the emissions of a partially premixed gasoline fueled compression ignition engine by means of injection characteristics and EGR

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Author(s): Nemati Arash | Barzegar Ramin | Khalil Arya Shahram | Khatamnezhad Hassan

Journal: Thermal Science
ISSN 0354-9836

Volume: 15;
Issue: 4;
Start page: 939;
Date: 2011;
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Keywords: CI engine | gasoline fuel | emission reduction | combustion | injection characteristics | EGR

ABSTRACT
This paper is presented in order to elucidate some numerical investigations related to a partially premixed gasoline fuelled engine by means of three dimensional CFD code. Comparing with the diesel fuel, gasoline has lower soot emission because of its higher ignition delay. The application of double injection strategy reduces the maximum heat release rate and leads to the reduction of NOx emission. For validation of the model, the results for the mean in-cylinder pressure, H.R.R., NOx and soot emissions are compared with the corresponding experimental data and show good levels of agreement. The effects of injection characteristics such as, injection duration, spray angle, nozzle hole diameter, injected fuel temperature and EGR rate on combustion process and emission formation are investigated yielding the determination of the optimal point thereafter. The results indicated that optimization of injection characteristics leads to simultaneous reduction of NOx and soot emissions with negligible change in IMEP.
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