Conjugate Heat Transfer Analysis of the Aero-Thermal Impact of Different Feeding Geometries for Internal Cooling in Lifetime Extension Processes for Heavy-Duty Gas Turbines

Lorenzo Laveneziana, Nicola Rosafio, Simone Salvadori, Daniela Anna Misul, Mirko Baratta, Luca Forno, Massimo Valsania and Marco Toppino
Additional contact information
Lorenzo Laveneziana: Politecnico di Torino, Dipartimento Energia DENERG, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy
Nicola Rosafio: Politecnico di Torino, Dipartimento Energia DENERG, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy
Simone Salvadori: Politecnico di Torino, Dipartimento Energia DENERG, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy
Daniela Anna Misul: Politecnico di Torino, Dipartimento Energia DENERG, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy
Mirko Baratta: Politecnico di Torino, Dipartimento Energia DENERG, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy
Luca Forno: EthosEnergy Italia S.p.A., Corso Romania, 661, 10156 Torino, Italy
Massimo Valsania: EthosEnergy Italia S.p.A., Corso Romania, 661, 10156 Torino, Italy
Marco Toppino: EthosEnergy Italia S.p.A., Corso Romania, 661, 10156 Torino, Italy

Energies, 2022, vol. 15, issue 9, 1-25

Abstract: Regulations from the European Union move towards a constant reduction of pollutant emissions to match the single-digit goal by 2050. Original equipment manufacturers propose newly designed components for the lifetime extension ofgGas turbines that both reduce emissions and allow for increasing thermodynamic performance by redesigning turbine cooling geometries and optimizing secondary air systems. The optimal design of internal cooling geometries allows for reducing both blade metal temperature and coolant mass-flow rates. In the present study, four different geometries of the region upstream from the blade’s internal cooling channels are investigated by using computational fluid dynamics with a conjugate heat transfer approach. The baseline configuration is compared to solutions that include turbulators, vanes, and a diffuser-like shapes. The impact of each solution on the blade metal temperature is thoroughly analysed. The diffuser-like solution allows for a more uniform distribution of the coolant and may reduce the metal temperature by 30% in the central part of the blade. There are also regions where the metal temperature increases up to 15%, thus requiring a specific thermal fatigue analysis. Eventually, the non-negligible impact of the coolant flow purged in the tip clearance region on the generation of the tip leakage vortex is described.

Keywords: secondary air systems; turbine cooling; tip leakage flows; lifetime extension; computational fluid dynamics; conjugate heat transfer (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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