The influence of swirl flow on soot formation processes inside the piston bowl of a small-bore diesel engine

Y. Zhang, D. Kim, L. Rao, S. Kook, K. S. Kim, C. B. Kweon

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

Abstract

Although swirling flow is known to enhance fuel-air mixing in diesel engines and thereby reducing the engine-out soot emissions, its influence on in-cylinder soot formation is poorly understood. The present study provides a direct comparison of soot particle structures between the wall-jet heads developing on up- and down-swirl sides via the thermophoresis-based soot particles sampling inside the piston bowl of a small-bore diesel engine. The sampled soot particles are imaged using a transmission electron microscope and post-processed to obtain the size of soot primary particles and aggregates as well as the fractal dimension. The TEM images show more significant reduction in soot concentration for the wall-jet head developing from the flame-wall impingement region in the up-swirl direction. The statistical analysis also shows that the increased size of soot aggregates and primary particles as well as the decreased fractal dimension are more apparent on the up-swirl side as the wall-jet travels against the swirl flow.

Original languageEnglish
Title of host publication11th Asia-Pacific Conference on Combustion, ASPACC 2017
Publication statusPublished - 2017
Externally publishedYes
EventAsia Pacific Conference on Combustion 2017 - Sydney, Australia
Duration: 10 Dec 201714 Dec 2017
Conference number: 11th
http://www.anz-combustioninstitute.org/ASPACC2017/

Conference

ConferenceAsia Pacific Conference on Combustion 2017
Abbreviated titleASPACC 2017
Country/TerritoryAustralia
CitySydney
Period10/12/1714/12/17
Internet address

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