https://doi.org/10.1140/epjs/s11734-025-01738-1
Regular Article
Soot coagulation due to pulsating flow in diesel engine exhaust: a numerical investigation
1
Department of Mechanical Engineering, Indian Institute of Technology Delhi, 110016, Delhi, India
2
Combustion Research, Cummins Technical Center India, 411038, Pune, Maharashtra, India
3
Department of Mechanical Engineering, Indian Institute of Technology Bombay, 400076, Mumbai, India
Received:
15
April
2025
Accepted:
4
June
2025
Published online:
19
June
2025
With the inclusion of limits on exhaust soot particle number density in the emission legislations of combustion engines, it is imperative to understand the soot particle dynamics both inside the cylinder, and in the exhaust passage. Although much has been studied on the soot particle size distributions from combustion engines, most of it pertains to soot formation during combustion and there is a lack of research addressing the soot particle dynamics in exhaust passages, such as ports and manifolds. In this article, the possibility of soot coagulation in the exhaust port of a diesel engine has been investigated. Full cycle combustion simulations have been performed for a direct injection diesel engine. A sectional soot model coupled with gas phase kinetics has been used. Soot particles have been found to coagulate in the exhaust port due to an increased residence time for the particles during flow reversals caused by pulsating flow. This novel finding has important implications as exhaust flow paths can be designed to improve coagulation of soot particles, and hence to reduce the number density of soot particles.
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
