A Numerical Study of the Effects of Oxy-Fuel Combustion under Homogeneous Charge Compression Ignition Regime

Mobasheri, Raouf, Aitouche, Abdel, Peng, Zhijun and Li, Xiang (2021) A Numerical Study of the Effects of Oxy-Fuel Combustion under Homogeneous Charge Compression Ignition Regime. International Journal of Engine Research . ISSN 1468-0874

Full content URL: https://doi.org/10.1177/1468087421993359

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A Numerical Study of the Effects of Oxy-Fuel Combustion under Homogeneous Charge Compression Ignition Regime
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Abstract

The European Union (EU) has recently adopted new directives to reduce the level of pollutant emissions from non-road mobile machinery engines. The main scope of project RIVER for which this study is relating is to develop possible solutions to achieve nitrogen-free combustion and zero-carbon emissions in diesel engines. RIVER aims to apply an oxy-fuel combustion with Carbon Capture and Storage (CCS) technology to eliminate NOx emission and to capture and store carbon emissions. As part of this project, a computational fluid dynamic (CFD) analysis has been performed to investigate the effects of oxy-fuel combustion on combustion characteristics and engine operating conditions in a diesel engine under Homogenous Charge Compression Ignition (HCCI) mode. A reduced chemical n-heptane-n-butanol-PAH mechanism which consists of 76 species and 349 reactions has been applied for oxy-fuel HCCI combustion modeling. Different diluent strategies based on the volume fraction of oxygen and a diluent gas has been considered over a wide range of air-fuel equivalence ratios. Variation in the diluent ratio has been achieved by adding different percentages of carbon dioxide for a range from 77 to 83 vol. % in the intake charge. Results show that indicated thermal efficiency (ITE) has reduced from 32.7% to 20.9% as the CO2 concentration has increased from 77% to 83% at low engine loads while it doesn’t bring any remarkable change at high engine loads. It has also found that this technology has brought CO and PM emissions to very ultra-low level (near zero) while NOx emissions have been completely eliminated.

Keywords:Oxy-fuel, HCCI combustion, Diesel Engine, Diluent Strategies, Pollutant Emissions
Subjects:H Engineering > H140 Mechanics
Divisions:College of Science > School of Engineering
ID Code:45163
Deposited On:14 Jun 2021 13:07

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