Constructal Design of Elliptical Conduits for Cooling of Gas Turbine Blades with External Thermal Barrier Coating

Gas turbines (GTs) are thermal machines used to transform the energy released in combustion with a hydrocarbon into mechanical power, in order to drive a machine or generate thrust in aircraft. The critical issue in the GT design are the parts exposed to extreme mechanical and thermal conditions, e....

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Detalles Bibliográficos
Autores principales: Bosc, Cristian, Lorenzini, G., Oliveira Rocha, L. A., Centeno, F. R., Gutiérrez, Fernando
Formato: Articulo
Lenguaje:Inglés
Publicado: 2019
Materias:
Ingeniería
Gas turbine
Elliptical conduits
Thermal performance
Cooled blades
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/146096
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-146096
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ingeniería
Gas turbine
Elliptical conduits
Thermal performance
Cooled blades
spellingShingle Ingeniería
Gas turbine
Elliptical conduits
Thermal performance
Cooled blades
Bosc, Cristian
Lorenzini, G.
Oliveira Rocha, L. A.
Centeno, F. R.
Gutiérrez, Fernando
Constructal Design of Elliptical Conduits for Cooling of Gas Turbine Blades with External Thermal Barrier Coating
topic_facet Ingeniería
Gas turbine
Elliptical conduits
Thermal performance
Cooled blades
description Gas turbines (GTs) are thermal machines used to transform the energy released in combustion with a hydrocarbon into mechanical power, in order to drive a machine or generate thrust in aircraft. The critical issue in the GT design are the parts exposed to extreme mechanical and thermal conditions, e.g., the first row of turbine blades. The GT thermal efficiency is limited by the maximum temperature the blade materials can withstand without softening or creeping. Currently, the maximum operating temperature is above the softening point of the blade material thanks to techniques of ceramic coatings of low thermal conductivity, called Thermal Barrier Coating (TBC), and techniques of blade cooling. The internal cooling of blades involves conduits inside them for air that comes from a bleed in an intermediate compressor stage. The air bleeding is around 3 to 5% of the main GT flow. This air and the heat flow that it receives are not used to generate power, so it is necessary to optimize the cooling techniques in order to control the temperature using the least amount of air and minimum heat flux evacuated, for holding the GT overall efficiency high. The present work studies the internal cooling of Elemental Gas Turbine Blade (EGTB) with a fixed thickness of the TBC and the optimization of the conduit shape and position over a cross section in 2D. The optimization is carried out by exhaustive searching method based on the Constructal Theory. The optimization of the position, size, and aspect ratio of EGTBs was done for two types of standard elliptical conduits of different geometries, uniformly distributed. Two different objective functions are analyzed: minimum maximum temperature on the metal and maximum heat evacuation efficiency. The outcome of this work establishes that the use of elliptical conduits of aspect ratio 2:5 leads to improvement in the thermal performance of cooled blades. As compared with circular conduits of the same area, elliptical conduits allow transfer of a greater amount of heat; with a correct design, they enable a lower maximum temperature on the metal. Besides, the constructal designs obtained in this study for the minimum maximum relative temperature ˜ T max or maximum heat evacuation efficiency ξ were not identical.
format Articulo
Articulo
author Bosc, Cristian
Lorenzini, G.
Oliveira Rocha, L. A.
Centeno, F. R.
Gutiérrez, Fernando
author_facet Bosc, Cristian
Lorenzini, G.
Oliveira Rocha, L. A.
Centeno, F. R.
Gutiérrez, Fernando
author_sort Bosc, Cristian
title Constructal Design of Elliptical Conduits for Cooling of Gas Turbine Blades with External Thermal Barrier Coating
title_short Constructal Design of Elliptical Conduits for Cooling of Gas Turbine Blades with External Thermal Barrier Coating
title_full Constructal Design of Elliptical Conduits for Cooling of Gas Turbine Blades with External Thermal Barrier Coating
title_fullStr Constructal Design of Elliptical Conduits for Cooling of Gas Turbine Blades with External Thermal Barrier Coating
title_full_unstemmed Constructal Design of Elliptical Conduits for Cooling of Gas Turbine Blades with External Thermal Barrier Coating
title_sort constructal design of elliptical conduits for cooling of gas turbine blades with external thermal barrier coating
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/146096
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