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Efficacité du refroidissement par film : comparaison des modèles de dynamique numérique des fluides du transfert de chaleur adiabatique et conjugué.

Film cooling effectiveness: comparison of adiabatic and conjugate heat transfer CFD models.

Auteurs : SILIETI M., KASSAB A. J., DIVO E.

Type d'article : Article

Résumé

This paper documents a computational investigation of the film cooling effectiveness of a 3-D gas turbine end wall with one fan-shaped cooling hole. The simulations were performed for adiabatic and conjugate heat transfer models. Turbulence closure was investigated using three different turbulence models: the realizable k-e model, the SST k-specific dissipation rate model, as well as the velocity variance scale turbulence model. Results were obtained for a blowing ratio of one, and a coolant-to-main-flow temperature ratio of 0.54. The simulations used a dense, high quality, O-type, hexahedral grid with three different schemes of meshing for the cooling hole: hexahedral-, hybrid-, and tetrahedral-topology grid. The computed flow/temperature fields are presented, in addition to local, two-dimensional distribution of film cooling effectiveness for the adiabatic and conjugate cases. Results are compared to experimental data in terms of centerline film cooling effectiveness downstream cooling-hole, the predictions with realizable k-e turbulence model exhibited the best agreement especially in the region for (2 not higher than x/D not higher than 6). Also, the results show the effect of the conjugate heat transfer on the temperature (effectiveness) field in the film cooling hole region and, thus, the additional heating up of the cooling jet itself. [Reprinted with permission from Elsevier. Copyright, 2009].

Détails

  • Titre original : Film cooling effectiveness: comparison of adiabatic and conjugate heat transfer CFD models.
  • Identifiant de la fiche : 2011-0074
  • Langues : Anglais
  • Source : International Journal of thermal Sciences - vol. 48 - n. 12
  • Date d'édition : 12/2009
  • DOI : http://dx.doi.org/10.1016/j.ijthermalsci.2009.04.007

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