Effects of In-Cylinder Flow Structures on Soot Formation and Oxidation in a Swirl-Supported Light-Duty Diesel Engine

Hesameddin Fatehi, Håkan Persson, Tommaso Lucchini, Mattias Ljungqvist, Oivind Andersson

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

Abstract

In this paper, computation fluid dynamics (CFD) simulations are performed to describe the effect of in-cylinder flow structures on the formation and oxidation of soot in a swirl-supported light-duty diesel engine. The focus of the paper is on the effect of swirl motion and injection pressure on late cycle soot oxidation. The structure of the flow at different swirl numbers is studied to investigate the effect of varying swirl number on the coherent flow structures. These coherent flow structures are studied to understand the mechanism that leads to efficient soot oxidation in late cycle. Effect of varying injection pressure at different swirl numbers and the interaction between spray and swirl motions are discussed. The complexity of diesel combustion, especially when soot and other emissions are of interest, requires using a detailed chemical mechanism to have a correct estimation of temperature and species distribution. In this work, Representative Interactive Flamelets (RIF) method is employed to describe the chemical reactions, ignition, flame propagation and emissions in the engine. The CFD simulations are validated using experimental measurement of light-duty diesel engine at two different loads. A good agreement is achieved between the model results and the pressure, heat release rates and emissions from the experiment. These cases are considered as the base-line for the parameter study cases.

Original languageEnglish
Title of host publication 14th International Conference on Engines & Vehicles: Technical paper
PublisherSociety of Automotive Engineers
DOIs
Publication statusPublished - 2019 Sept 9
EventSAE 14th International Conference on Engines and Vehicles, ICE 2019 - Capri, Italy
Duration: 2019 Sept 152019 Sept 19

Publication series

NameSAE Technical Papers
PublisherSociety of Automotive Engineers
ISSN (Print)0148-7191

Conference

ConferenceSAE 14th International Conference on Engines and Vehicles, ICE 2019
Country/TerritoryItaly
CityCapri
Period2019/09/152019/09/19

Subject classification (UKÄ)

  • Energy Engineering

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