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- W2034144075 abstract "The continuing need to improve both the efficiency and the specific power of gas turbines requires to progressively increase the temperatures of the turbine inlet. Because the first stator blades are heavily thermally loaded, efficient blade cooling is necessary. The cooling system is particularly delicate and its design must follow these guidelines: minimum thermodynamic and fluid dynamic losses; limited blade temperature even for reduced cooling mass flow. Although the problem is important, analyses of possible designs are not common in literature and many constructors refer to practical experience and to various experimental results. This paper presents a comparative investigation to determine the effects of internal and external cooling in the same blade, on the basis of different combined solutions as it often happens. The cooling model will be considered one-dimensional: the limitation in the accuracy of the results is by far overcome by the simplicity and versatility of the approach. Finally, practical hints for designing an effective cooling system are derived, with particular attention to impingement. Then, global cooling parameters and medium blade will be determined in off-design condition. Modélisation d'un système de refroidissement d'aubage de turbine à gaz. La nécessité d'accroître la puissance et le rendement des turbines à gaz requiert une élévation régulière de la température maximale du cycle. Les sollicitations thermiques étant très fortes, le refroidissement de l'aubage est indispensable. Le système de refroidissement à l'étude est très délicat et doit parvenir à ces résultats: contenir les pertes thermo-fluidodynamiques, garantir un bon fonctionnement même avec un débit réduit du fluide de refroidissement. Dans cet article, nous présentons une étude comparative des différentes solutions possibles pour le refroidissement d'un aubage de turbine à gaz pour application industrielle. Les résultats montrent la possibilité de calculer la distribution de la température sur l'aubage afin d'optimiser sa répartition ainsi que son comportement en condition de charge partielle." @default.
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- W2034144075 date "1996-04-01" @default.
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- W2034144075 title "A numerical procedure to design internal cooling of gas turbine stator blades" @default.
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- W2034144075 doi "https://doi.org/10.1016/s0035-3159(96)80018-3" @default.
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