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.

A Numerical Procedure To Design Internal Cooling Of Gas Turbines Stator Blades / B. FACCHINI; CARCASCI C.. - In: REVUE GENERALE DE THERMIQUE. - ISSN 0035-3159. - STAMPA. - 35:(1996), pp. 257-268. [10.1016/S0035-3159(96)80018-3]

A Numerical Procedure To Design Internal Cooling Of Gas Turbines Stator Blades

FACCHINI, BRUNO;CARCASCI, CARLO
1996

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.
1996
35
257
268
B. FACCHINI; CARCASCI C.
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/208354
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