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International Journal of Chemical Engineering
Volume 2012 (2012), Article ID 898742, 22 pages
http://dx.doi.org/10.1155/2012/898742
Research Article

Chemical Kinetic Study of Nitrogen Oxides Formation Trends in Biodiesel Combustion

1Department of Applied Mechanics, Chalmers University of Technology, 412-96 Göteborg, Sweden
2CMT-Motores Térmicos, Universidad Politécnica de Valencia, 46022 Valencia, Spain

Received 6 December 2011; Accepted 28 February 2012

Academic Editor: Mahesh T. Dhotre

Copyright © 2012 Junfeng Yang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The use of biodiesel in conventional diesel engines results in increased emissions; this presents a barrier to the widespread use of biodiesel. The origins of this phenomenon were investigated using the chemical kinetics simulation tool: CHEMKIN-2 and the CFD KIVA3V code, which was modified to account for the physical properties of biodiesel and to incorporate semidetailed mechanisms for its combustion and the formation of emissions. Parametric ϕ-T maps and 3D engine simulations were used to assess the impact of using oxygen-containing fuels on the rate of NO formation. It was found that using oxygen-containing fuels allows more O2 molecules to present in the engine cylinder during the combustion of biodiesel, and this may be the cause of the observed increase in NO emissions.