It is well known that in a gas turbine plant an increase in the turbine inlet temperature improves both the efficiency and the specific work output. However, the continuous exposure of statoric or rotoric blades to the hot combustions gas (1500-2000K) induces structural damage to the blade material and reduces its operational life. A recent development in the blade cooling ena is that of combining film cooling and a porous ceramic coating ound the blade surface. Such a system is currently the best available approximation to continuous injection, known to be the most effective cooling technique. In this paper a numerical analysis of a simplified 3-D model of a rotor blade is performed to quantitatively assess the improvement in the cooling effectiveness brought about by the ceramic coating, with respect to the same blade geometry cooled by conventional film cooling. The results of this study show that the cooling effectiveness increases and the entropy generation rate decreases when a 0.2 mm thick ceramic coating is applied.
Thermo-fluid-dynamic analysis of a gas turbine blade with porous cooling / Bianchi, Flavio Emilio; Bonciolini, Giacomo; Bufalieri, Alessio; Masci, Roberta. - ELETTRONICO. - (2015). (Intervento presentato al convegno ECOS 2015 - 28th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems tenutosi a Pau, France nel 29 June - 3 July 2015).
Thermo-fluid-dynamic analysis of a gas turbine blade with porous cooling
MASCI, ROBERTA
2015
Abstract
It is well known that in a gas turbine plant an increase in the turbine inlet temperature improves both the efficiency and the specific work output. However, the continuous exposure of statoric or rotoric blades to the hot combustions gas (1500-2000K) induces structural damage to the blade material and reduces its operational life. A recent development in the blade cooling ena is that of combining film cooling and a porous ceramic coating ound the blade surface. Such a system is currently the best available approximation to continuous injection, known to be the most effective cooling technique. In this paper a numerical analysis of a simplified 3-D model of a rotor blade is performed to quantitatively assess the improvement in the cooling effectiveness brought about by the ceramic coating, with respect to the same blade geometry cooled by conventional film cooling. The results of this study show that the cooling effectiveness increases and the entropy generation rate decreases when a 0.2 mm thick ceramic coating is applied.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
