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

    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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