Article: In-cylinder reduction of PM and NOx emissions from diesel combustion with advanced injection strategies Journal: International Journal of Vehicle Design (IJVD) 2006 Vol.41 No.1/2/3/4 pp.83 - 102 Abstract: The effect of advanced injection strategies, including pilot- and post-injections, on reducing pollutants from diesel combustion is investigated through a synergistic approach combining experiments and Computational Fluid Dynamics (CFD) simulations. It is shown experimentally that pilot injections have the potential to reduce NOx and particulate matter emissions simultaneously when the timing of the pilot is selected appropriately. To gain further understanding of the combustion and emissions formation mechanisms from multiple injection events, a CFD analysis is performed to model in-cylinder processes. Results show that benefits of pilot injection stem from improved fuel-air mixing and the reduction of the amount of diffusion combustion. Furthermore, CFD analysis demonstrates that post injection can accelerate the soot oxidation process if the injection timing and the amount of fuel are suitably selected, while simultaneously reducing NOx by reducing the amount of fuel in the main event and lowering peak combustion temperatures. Inderscience Publishers - linking academia, business and industry through research

Title: In-cylinder reduction of PM and NO_x emissions from diesel combustion with advanced injection strategies

Authors: C.A. Chryssakis, J.R. Hagena, A. Knafl, V.D. Hamosfakidis, Z.S. Filipi, Dennis N. Assanis

Addresses: University of Michigan, 2031 W.E. Lay Automotive Lab., 1231 Beal Ave., Ann Arbor, MI 48109, USA. ' University of Michigan, 2031 W.E. Lay Automotive Lab., 1231 Beal Ave., Ann Arbor, MI 48109, USA. ' University of Michigan, 2031 W.E. Lay Automotive Lab., 1231 Beal Ave., Ann Arbor, MI 48109, USA. ' University of Michigan, 2031 W.E. Lay Automotive Lab., 1231 Beal Ave., Ann Arbor, MI 48109, USA. ' University of Michigan, 2031 W.E. Lay Automotive Lab., 1231 Beal Ave., Ann Arbor, MI 48109, USA. ' Department of Mechanical Engineering, University of Michigan, 2236 G.G. Brown, 2350 Hayward Street, Ann Arbor, MI 48109, USA

Abstract: The effect of advanced injection strategies, including pilot- and post-injections, on reducing pollutants from diesel combustion is investigated through a synergistic approach combining experiments and Computational Fluid Dynamics (CFD) simulations. It is shown experimentally that pilot injections have the potential to reduce NO_x and particulate matter emissions simultaneously when the timing of the pilot is selected appropriately. To gain further understanding of the combustion and emissions formation mechanisms from multiple injection events, a CFD analysis is performed to model in-cylinder processes. Results show that benefits of pilot injection stem from improved fuel-air mixing and the reduction of the amount of diffusion combustion. Furthermore, CFD analysis demonstrates that post injection can accelerate the soot oxidation process if the injection timing and the amount of fuel are suitably selected, while simultaneously reducing NO_x by reducing the amount of fuel in the main event and lowering peak combustion temperatures.

Keywords: computational fluid dynamics; CFD; combustion; diesel engines; experiment; injection strategies; NO_x; nitrogen oxide; soot; vehicle emissions; simulation; modelling; in-cylinder processes; particulate matter.

DOI: 10.1504/IJVD.2006.009663

International Journal of Vehicle Design, 2006 Vol.41 No.1/2/3/4, pp.83 - 102

Published online: 04 May 2006 *

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Title: In-cylinder reduction of PM and NOx emissions from diesel combustion with advanced injection strategies

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Title: In-cylinder reduction of PM and NO_x emissions from diesel combustion with advanced injection strategies