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INFLUENCE OF COMBUSTOR FLOW WITH SWIRL ON INTEGRATED COMBUSTOR VANE CONCEPT FULL-STAGE PERFORMANCE

[+] Author and Article Information
Simon Jacobi

Osney Thermo-Fluids Laboratory, Department of Engineering Science, University of Oxford, Oxford OX2 0ES, United Kingdom
simon.jacobi@eng.ox.ac.uk

Budimir Rosic

Osney Thermo-Fluids Laboratory, Department of Engineering Science, University of Oxford, Oxford OX2 0ES, United Kingdom
budimir.rosic@eng.ox.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4037820 History: Received August 20, 2017; Revised August 26, 2017

Abstract

The integrated combustor vane concept for power genera- tion gas turbines with can combustors has been shown to have significant benefits compared to conventional nozzle guide vanes. Aerodynamic loss, heat transfer levels and cooling requirements are reduced while stage efficiency is improved by approximately 1.5% (for a no-swirl scenario). Engine realistic combustor flow with swirl however leads to increased turning non-uniformity downstream of the integrated vanes. This paper thus illustrates the altered integrated vane stage performance caused by inlet swirl. The study shows a distinct performance penalty for the in- tegrated vane rotor as a result of increased rotor incidence and the rotor's interaction with the residual swirl core. The stage effi- ciency advantage of the integrated combustor vane concept com- pared to the conventional design is thus reduced to 0.7%. It is furthermore illustrated how integrated vane profiling is suitable to reduce the turning variation across the span downstream of the vane, further improve stage efficiency (in this case by 0.23%) and thus mitigate the distinct impact of inlet swirl on integrated vane stage performance.

Copyright (c) 2017 by ASME
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