Nozzle Guide Vanes aero-thermal performance is commonly assessed in the industry using tangentially-averaged quantities, imposed at the combustor-turbine interface as inlet conditions for RANS models. However, recent studies have shown that scale-resolving approaches can reproduce the impact of unsteady fluctuations on turbulent mixing. An experimental test case with a combustor simulator and a nozzle cascade is investigated, comparing two numerical modelling strategies: i) Scale-adaptive simulation (SAS) including both combustor and turbine; ii) RANS simulation of the nozzles with SAS-derived combustor outlet conditions. This work is the continuation of a previous activity that revealed the capabilities of unsteady CFD to improve the prediction of flow field and film-cooling adiabatic effectiveness. The comparison is herein extended to heat transfer, to highlight the benefits of combustor-turbine conjugate simulations, in addition to address the impacts on vanes heat load due to highly swirled rather than uniform inlet flow fields.

External heat transfer on nozzle guide vanes under highly swirled combustor outlet flow / Cubeda S.; Mazzei L.; Andreini A.. - ELETTRONICO. - (2019), pp. 1-10. (Intervento presentato al convegno 13th European Turbomachinery Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2019 nel 2019).

External heat transfer on nozzle guide vanes under highly swirled combustor outlet flow

Cubeda S.
;
Mazzei L.;Andreini A.
2019

Abstract

Nozzle Guide Vanes aero-thermal performance is commonly assessed in the industry using tangentially-averaged quantities, imposed at the combustor-turbine interface as inlet conditions for RANS models. However, recent studies have shown that scale-resolving approaches can reproduce the impact of unsteady fluctuations on turbulent mixing. An experimental test case with a combustor simulator and a nozzle cascade is investigated, comparing two numerical modelling strategies: i) Scale-adaptive simulation (SAS) including both combustor and turbine; ii) RANS simulation of the nozzles with SAS-derived combustor outlet conditions. This work is the continuation of a previous activity that revealed the capabilities of unsteady CFD to improve the prediction of flow field and film-cooling adiabatic effectiveness. The comparison is herein extended to heat transfer, to highlight the benefits of combustor-turbine conjugate simulations, in addition to address the impacts on vanes heat load due to highly swirled rather than uniform inlet flow fields.
2019
13th European Turbomachinery Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2019
13th European Turbomachinery Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2019
2019
Cubeda S.; Mazzei L.; Andreini A.
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1294919
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