A Computational Study of In-Cylinder NOₓ Reduction Strategies for a Compression-Ignition Engine Fueled with Diesel/Hydrogen Mixtures


Considerable efforts have been made to introduce alternative fuels for use in conventional diesel and gasoline engines. There is significant interest in adding hydrogen to a diesel engine to reduce emissions and improve efficiency. However, the main challenge associated with the use of hydrogen in diesel engines is high nitrogen oxide (NOX) emissions. In the present study, a reduced chemical kinetics mechanism, consisting of 52 reactions and 29 chemical species for n-heptane fuel combustion, was incorporated with detailed chemical kinetics consisting of 29 reactions for hydrogen as well as additional nitrogen oxidation. This reaction mechanism was coupled with 3-D advanced CFD software to investigate the performance and emission characteristics of a diesel-hydrogen dual-fuel engine. Computational results showed good agreements with the experimental results for brake thermal efficiency, CO2, CO, and NOX emissions. The model was then employed to examine the effects of exhaust gas recirculation (EGR) and N2 dilution on NOX emissions. The computational results quantified the reduction in NOX emissions with EGR and N2 dilution, and a more remarkable reduction was found with 30% N2 dilution. However, in terms of the N2 dilution, a general decreasing trend was observed for both NOX and CO2 emissions, while CO emissions increased. In relation to the EGR, the NOX emissions decreased while CO2 and CO emissions significantly increased. Additionally, the results showed that the indicated mean effective pressure (IMEP) and indicated power decreased as the N2 dilution increased. The same trend was observed for the EGR but the reduction was less compared to that of the N2 dilution.

Meeting Name

ASME 2015 9th International Conference on Energy Sustainability, ES2015 (2015: Jun. 28-Jul. 2, San Diego, CA)


Mechanical and Aerospace Engineering

Keywords and Phrases

Alternative fuels; Carbon; Carbon dioxide; Cell engineering; Climate control; Cogeneration plants; Diesel engines; Dilution; Electric power system control; Electric power system economics; Electric power transmission networks; Engine cylinders; Engines; Environmental technology; Exhaust gas recirculation; Exhaust gases; Gas emissions; Geothermal energy; Historic preservation; Hydrogen; Nitrogen oxides; Reduction; Smart power grids; Solar energy; Solar power generation; Sustainable development; Brake thermal efficiency; Chemical kinetics mechanisms; Compression ignition engine; Computational studies; Detailed chemical kinetic; Exhaust gas recirculation (EGR); Indicated mean effective pressure; Performance and emissions; Dual fuel engines

International Standard Book Number (ISBN)


Document Type

Article - Conference proceedings

Document Version


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© 2015 American Society of Mechanical Engineers (ASME), All rights reserved.

Publication Date

01 Jun 2015