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FP5

MINNOX Résumé de rapport

Project ID: ENK6-CT-2001-00530
Financé au titre de: FP5-EESD
Pays: Austria

CFD software capable of simulating heat transfer and simultaneously treating the three-dimensional temperature fields in the combustion chamber

The CFD code KIVA-3 is a computer program for the numerical calculation of transient, two- and three dimensional, chemically reactive fluid flows with sprays. The CFD code STAR-CD is multi- purpose simulation software using unstructured grids, which can be used for different kind of applications.

Within the actual version of the program new sub-models from the ongoing project will be implemented. These sub-models make it possible to simulate the heat transfer on a higher level of accuracy than has been done up to now. The relevant heat transfer subroutines are LAWALL(KESOLV) in case of KIVA-3, user-defined subroutine MODSWF, ROUGHW(SORKEP) in case of STAR-CD.

Since both KIVA-3V and STAR-CD do not contain a local prescription of wall temperatures a CFD-FEM interface needs to be implemented.

A new wall layer meshing strategy is envisaged that allows an adaptation of the mesh size next to wall dependent on local wall temperature and burnt gas temperature after flame arrival. In the standard wall function approach employed both in KIVA-3V and STAR-CD the variable-density affect in the wall boundary layer is left aside. New compressible wall functions have been analyzed and tested during the project.

For given one-cylinder engine test cases and defined operating points (including the motored case) the computed heat fluxes have been compared with measured ones at defined sensor points across the cylinder head.

The comparison of measured and computed heat flux data in a wide range of operation provides a data base for spark ignition engine heat transfer.

Informations connexes

Reported by

AVL List GmbH
Hans List Platz 1
8020 Graz, Styria
Austria
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