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http://dx.doi.org/10.5916/jkosme.2008.32.8.1129

Assessment of Turbulence Models for Engine Intake and Compression Flow Analysis  

Park, Kweon-Ha (한국해양대학교 기계정보공학부)
Kim, Jae-Gon (신라공업고등학교)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.32, no.8, 2008 , pp. 1129-1140 More about this Journal
Abstract
Many turbulence models have been developed in order to analyze the flow characteristics in an engine cylinder. Watkins introduced k-${\varepsilon}$ turbulence model for in-cylinder flow, and Reynolds modified turbulence dissipation rate by applying rapid transformation theory, Wu suggested k-${\varepsilon}-{\tau}$ turbulence model in which length scale and time scale are separated to introduce turbulence time scale, and Orszag proposed k-${\varepsilon}$ RNG model. This study applied the models to in-cylinder flow induced by intake valve and piston moving. All models showed similar flow fields during early stage of intake stroke. At the end of compression stroke, ${\kappa}-{\varepsilon}$ Watkins, ${\kappa}-{\varepsilon}$ Reynolds and ${\kappa}-{\varepsilon}$ RNG predicted well second and third vortex, especially ${\kappa}-{\varepsilon}$ RNG produced new forth vortex near central axis at the lower part of cylinder which was not predicted by the other models.
Keywords
Turbulence model; Engine intake and compression; Flow analysis;
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