A double-wall cooling scheme combined with effusion cooling offers a practical approximation to transpiration cooling which in turn presents the potential for very high cooling effectiveness. The use of the conventional conjugate computational fluid dynamics (CFD) for the double-wall blade can be computationally expensive and this approach is therefore less than ideal in cases where only the preliminary results are required. This paper presents a computationally efficient numerical approach for analyzing a double-wall effusion cooled gas turbine blade. An existing correlation from the literature was modified and used to represent the two-dimensional distribution of film cooling effectiveness. The internal heat transfer coefficient was calculated from a validated conjugate analysis of a wall element representing an element of the aerofoil wall and the conduction through the blade solved using a finite element code in ANSYS. The numerical procedure developed has permitted a rapid evaluation of the critical parameters including film cooling effectiveness, blade temperature distribution (and hence metal effectiveness), as well as coolant mass flow consumption. Good agreement was found between the results from this study and that from literature. This paper shows that a straightforward numerical approach that combines an existing correlation for film cooling from the literature with a conjugate analysis of a small wall element can be used to quickly predict the blade temperature distribution and other crucial blade performance parameters.
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January 2019
Research-Article
A Three-Dimensional Conjugate Approach for Analyzing a Double-Walled Effusion-Cooled Turbine Blade
Gladys C. Ngetich,
Gladys C. Ngetich
Department of Engineering Science,
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: gladys.ngetich@oriel.ox.ac.uk
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: gladys.ngetich@oriel.ox.ac.uk
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Alexander V. Murray,
Alexander V. Murray
Department of Engineering Science,
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: alexander.murray@eng.ox.ac.uk
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: alexander.murray@eng.ox.ac.uk
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Peter T. Ireland,
Peter T. Ireland
Department of Engineering Science,
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: peter.ireland@eng.ox.ac.uk
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: peter.ireland@eng.ox.ac.uk
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Eduardo Romero
Eduardo Romero
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Gladys C. Ngetich
Department of Engineering Science,
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: gladys.ngetich@oriel.ox.ac.uk
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: gladys.ngetich@oriel.ox.ac.uk
Alexander V. Murray
Department of Engineering Science,
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: alexander.murray@eng.ox.ac.uk
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: alexander.murray@eng.ox.ac.uk
Peter T. Ireland
Department of Engineering Science,
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: peter.ireland@eng.ox.ac.uk
University of Oxford,
Oxford OX1 3PJ, UK
e-mail: peter.ireland@eng.ox.ac.uk
Eduardo Romero
1Corresponding author.
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 20, 2018; final manuscript received August 29, 2018; published online October 17, 2018. Editor: Kenneth Hall.
J. Turbomach. Jan 2019, 141(1): 011002 (10 pages)
Published Online: October 17, 2018
Article history
Received:
July 20, 2018
Revised:
August 29, 2018
Citation
Ngetich, G. C., Murray, A. V., Ireland, P. T., and Romero, E. (October 17, 2018). "A Three-Dimensional Conjugate Approach for Analyzing a Double-Walled Effusion-Cooled Turbine Blade." ASME. J. Turbomach. January 2019; 141(1): 011002. https://doi.org/10.1115/1.4041379
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