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 language | English |
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Title of host publication | 11th Asia-Pacific Conference on Combustion, ASPACC 2017 |
Publication status | Published - 2017 |
Externally published | Yes |
Event | Asia Pacific Conference on Combustion 2017 - Sydney, Australia Duration: 10 Dec 2017 → 14 Dec 2017 Conference number: 11th http://www.anz-combustioninstitute.org/ASPACC2017/ |
Conference
Conference | Asia Pacific Conference on Combustion 2017 |
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Abbreviated title | ASPACC 2017 |
Country/Territory | Australia |
City | Sydney |
Period | 10/12/17 → 14/12/17 |
Internet address |