In-cylinder reduction of PM and NOx emissions from diesel combustion with advanced injection strategies. (5th May 2006)

• Record Type: Journal Article
• Authors: Chryssakis, C.A.; Hagena, J.R.; Knafl, A.; Hamosfakidis, V.D.; Filipi, Z.S.; Assanis, Dennis
• Is Part Of: International journal of vehicle design. Volume 41:Number 1/2/3/4(2006)
• Page Start: 83
• Page End: 102
• Publication Date: 2006-05-05
• Subjects: computational fluid dynamics -- CFD -- combustion -- diesel engines -- experiment -- injection strategies -- NOx -- nitrogen oxide -- soot -- vehicle emissions -- simulation -- modelling -- in-cylinder processes -- particulate matter; Motor vehicles -- Design and construction -- Periodicals; 629.231
• Languages: English
• ISSNs: 0143-3369

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.