Soot Formation Modeling of n-dodecane and Diesel Sprays under Engine-Like Conditions

Kar Mun Pang, Hiew Mun Poon, Hoon Kiat Ng, Suyin Gan, Jesper Schramm

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

This work concerns the modelling of soot formation process in diesel spray combustion under engine-like conditions. The key aim is to investigate the soot formation characteristics at different ambient temperatures. Prior to simulating the diesel combustion, numerical models including a revised multi-step soot model is validated by comparing to the experimental data of n-dodecane fuel in which the associated chemistry is better understood. In the diesel spray simulations, a single component n-heptane mechanism and the multi-component Diesel Oil Surrogate (DOS) model are adopted. A newly developed C16-based model which comprises skeletal mechanisms of n-hexadecane, heptamethylnonane, cyclohexane and toluene is also implemented. Comparisons of the results show that the simulated liftoff lengths are reasonably well-matched to the experimental measurement, where the relative differences are retained to below 18%. Only that predicted by the DOS model in the 900 K case is overestimated by approximately 28%. The experimental maximum soot volume fraction (SVF) rises by approximately 7.0 fold as the ambient temperature is raised from 900 K to 1000 K. The ratio calculated by chemical mechanisms without toluene chemistry is approximately two-fold. Improvement is observed when toluene chemistry is considered, producing ratios of greater than 3.7. This can be attributed to the higher amount of soot precursor and surface growth species formed through the toluene oxidation pathways in the 1000 K case. A surrogate model that considers the kinetics of aromatic compounds is hence more promising to improve the prediction of local SVF which is significant to soot radiation modelling.
Original languageEnglish
Title of host publicationProceedings of the 12th International Conference on Engines & Vehicles : SAE Technical Paper
Number of pages13
PublisherSociety of Automotive Engineers
Publication date2015
Article number2015-24-2468
DOIs
Publication statusPublished - 2015
Event12th International Conference on Engines & Vehicles - Capri, Italy
Duration: 13 Sep 201517 Sep 2015
http://www.sae-na.it/ice2015.asp

Conference

Conference12th International Conference on Engines & Vehicles
CountryItaly
CityCapri
Period13/09/201517/09/2015
Internet address
SeriesS A E Technical Papers
ISSN0148-7191

Cite this

Pang, K. M., Poon, H. M., Ng, H. K., Gan, S., & Schramm, J. (2015). Soot Formation Modeling of n-dodecane and Diesel Sprays under Engine-Like Conditions. In Proceedings of the 12th International Conference on Engines & Vehicles: SAE Technical Paper [2015-24-2468] Society of Automotive Engineers. S A E Technical Papers https://doi.org/10.4271/2015-24-2468