Title

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

Authors

Authors

M. Silieti; A. J. Kassab;E. Divo

Comments

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Abbreviated Journal Title

Int. J. Therm. Sci.

Keywords

Conjugate heat transfer; Film cooling; Film cooling effectiveness; Turbulence modeling; Thermodynamics; Engineering, Mechanical

Abstract

This paper documents a computational investigation of the film cooling effectiveness of a 3-D gas turbine endwall 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-epsilon model, the SST k-omega model, as well as the v(2)-f turbulence model. Results were obtained for a blowing ratio of one, and a coolant-to-mainflow 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 additon 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-epsilon turbulence model exhibited the best agreement especially in the region for (2 <= x/D <= 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. (C) 2009 Elsevier Masson SAS. All rights reserved.

Journal Title

International Journal of Thermal Sciences

Volume

48

Issue/Number

12

Publication Date

1-1-2009

Document Type

Article

Language

English

First Page

2237

Last Page

2248

WOS Identifier

WOS:000272726100006

ISSN

1290-0729

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