MATEC Web Conf.
Volume 135, 20178th International Conference on Mechanical and Manufacturing Engineering 2017 (ICME’17)
|Number of page(s)||13|
|Published online||20 November 2017|
Detached-Eddy Simulation of Trailing-Edge (TE) Cutback Turbine Blade Cooling
Department of Mechanical Engineering, Universitas Muhammadiyah Surakarta, Jl. A.Yani Surakarta, Indonesia, 57102
2 Department of Engineering Design and Mathematics, University of the West of England, Bristol BS16 1QY, UK
3 School of Aerospace & Aircraft Engineering, Kingston University, Friars Avenue, London SW15 3DW, UK
* Corresponding author: Marwan.Effendy@ums.ac.id
This research evaluates the cooling performance of trailing-edge cutback for gas turbine blade. By using DES based on SST k-ω turbulence model, numerical investigations were performed at two steps: first, to validate simulation results from an existing TE cutback cooling with staggered pin-fin arrays inside the cooling passage against experimental measurement. Three types structured mesh from coarse (Δy+ = 0.74) to fine (Δy+ = 1.22) were evaluated during this step; second, to investigate the TE cutback cooling performance on various blowing ratios. Simulations were performed by keeping the same initials and boundary conditions as the experiment. The result indicates that validation can be considered acceptable by controlling grid quality resolution near wall regions. Both computational data of the adiabatic film-cooling effectiveness and the discharge coefficient are in good agreement with available experimental measurements. The averaged film-cooling effectiveness along the cutback region is highly influenced by the blowing ratios, which is to be related to the turbulent flow structures formed at the mixing region as the impact of coolant flow ejection. The increase of coolant jet velocity triggers the heat transfer process up to the downstream region of TE cutback cooling.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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