Aerodynamic investigation of external cooling and applicability of superposition
2015 (English)In: 11th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2015, European Conference on Turbomachinery (ETC) , 2015Conference paper (Refereed)
An experimental investigation of the overall external cooling on a cooled nozzle guide vane has been conducted in a transonic annular sector cascade. The investigated vane is a typical transonic high pressure gas turbine vane, geometrically similar to a real engine component. The investigations are performed for various coolant-to-mainstream mass-flux ratios. Results indicate that the aerodynamic loss is influenced substantially with the change of the cooling flow. Area-averaged exit flow angles in midspan region are unaffected at moderate film coolant flows, for all cooling configurations except for trailing edge cooling. The trailing edge cooling decreases the turning in all investigated cases. Results lead to a conclusion that both trailing edge and suction side cooling have significant influence on the aerodynamic loss whereas the shower head cooling is less sensitive to the loss. Investigations with individual cooling features essentially lead to the applicability of the superposition technique regarding the aerodynamic loss for film cooled vanes, which is this paper's contribution to the research field. Results show that the superposition technique can be used for the profile loss but not for the secondary loss.
Place, publisher, year, edition, pages
European Conference on Turbomachinery (ETC) , 2015.
Aerodynamic loss, Film cooling, Nozzle guide vane, Superposition, Trailing edge cooling, Aerodynamics, Coolants, Fluid dynamics, Gas turbines, Nozzles, Thermodynamics, Transonic aerodynamics, Turbomachinery, Nozzle guide vanes, Trailing edges, Cooling
IdentifiersURN: urn:nbn:se:kth:diva-194657ScopusID: 2-s2.0-84983171152OAI: oai:DiVA.org:kth-194657DiVA: diva2:1050614
11th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2015, 23 March 2015 through 27 March 2015
QC 201611292016-11-292016-10-312016-11-29Bibliographically approved