Relating integral length scale to turbulent time scale and comparing k-e and RNG k-e turbulence models in diesel combustion simulation

Ossi Kaario, Martti Larmi, Franz Tanner

Research output: Book/ReportReport

Abstract

A modified version of the Laminar and Turbulent Characteristic Time combustion model and the Hiroyasu-Magnussen soot model have been implemented in the flow solver Star-CD. Combustion simulations of three DI diesel engines, utilizing the standard k-ε turbulence model and a modified version of the RNG k-ε turbulence model, have been performed and evaluated with respect to combustion performance and emissions. Adjustments of the turbulent characteristic combustion time coefficient, which were necessary to match the experimental cylinder peak pressures of the different engines, have been justified in terms of non-equilibrium turbulence considerations. The results confirm the existence of a correlation between the integral length scale and the turbulent time scale. This correlation can be used to predict the combustion time scale in different engines. It was found that, although the standard k-ε turbulence model produced adequate results for the larger engines, the RNG turbulence model gave better agreement with the experimental data for all engines.
Original languageEnglish
Place of PublicationWarrendale
Number of pages17
DOIs
Publication statusPublished - 2002
MoE publication typeD4 Published development or research report or study
EventSAE 2002 World Congress & Exhibition - Detroit, United States
Duration: 4 Mar 20027 Mar 2002

Publication series

SeriesSAE Technical Paper Series
Number2002-01-1117
ISSN0148-7191

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