CFD Modeling of the Initial Turbulence Prior to Combustion in a Large Bore Diesel Engine Helsinki University of Technology, Finland

Format:

Conference/Event

Author/Creator:

Lendormy, Eric, author.

Conference Name:

SAE World Congress & Exhibition (2008-04-14 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2008

Summary:

The study aims at providing more accurate initial conditions for turbulence prior to combustion with the help of a four valve, large bore diesel engine CFD model. Combustion simulations are typically done with a sector mesh and initial turbulence in these simulations is usually taken from relatively inaccurate correlations. This study also aims at developing a more accurate initial turbulence correlation for combustion simulations. A one-dimensional model was first used to provide boundary conditions as well as the initial flow conditions at the beginning of the simulation. Steady state and transient boundary conditions were studied. Also, the standard κ - ε and RNG/κ - ε turbulence models were compared. From the averaged values of turbulence kinetic energy and its dissipation rate over the cylinder volume, a re-tuned correlation for defining the initial turbulent conditions at bottom dead center (BDC) prior to the compression stroke is proposed. The main findings of this study are: the two turbulence models used actually predict fairly similar turbulence kinetic energy and dissipation rate at BDC. The turbulence model has a stronger effect on the results than the change in boundary pressure

Notes:

Vendor supplied data

Publisher Number:

2008-01-0977

Access Restriction:

Restricted for use by site license