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ANALYSIS OF COOLING EFFECTIVENESS AND HEAT TRANSFER VARIATIONS ON THE END WALL OF A NOZZLE GUIDE VANE CAUSED BY TURBINE LEAKAGE FLOWS

Dannhauer, Axel (2008) ANALYSIS OF COOLING EFFECTIVENESS AND HEAT TRANSFER VARIATIONS ON THE END WALL OF A NOZZLE GUIDE VANE CAUSED BY TURBINE LEAKAGE FLOWS. ASME Turbo Expo, 9. - 13. Juni 2008, Berlin, Deutschland.

Full text not available from this repository.

Abstract

Extensive thermodynamic measurements were carried out on a vane endwall to investigate the interaction with the upstream rotor leakage flow. The experiments were performed at the low speed cascade wind tunnel (NGG) of the German Aerospace Centre (DLR), Göttingen. The investigated cascade consists of three large nozzle guide vanes. The effect of tip leakage flow was simulated by blow-off air. This was ejected through a leakage gap in the side wall closely upstream of the cascade. To investigate the different, possible constructive solutions of tip clearances, at least two different blowing directions were investigated: tangential and perpendicular to the mainstream at three different mass flow ratios. The influence of inlet turbulence was investigated too, applying an active turbulence grid in the intake. To get a realistic temperature gradient the leakage air was cooled down by a heat exchanger to adjust a distinctive temperature difference to the mainstream. The surface temperatures were detected by an infrared camera. Heat flux measurements assisted the interpretation of the resulting distributions of film-cooling effectiveness. It appeared that even for perpendicular injection a large amount of leakage air is distributed to the front area of the end wall although the secondary flow structure is amplified. The leakage air for mass flow ratios until 1.0% is visible between the 3D-separation lines of the horseshow vortices. With tangential ejection an adiabatic effectiveness of haw=0.2 at the cascade outlet was detectable. For both investigated injection directions it was possible to weaken the three dimensional vortex structures. For a further increase in resolution of the adiabatic effectiveness some examinations applying the so-called superposition method were performed.

Item URL in elib:https://elib.dlr.de/83085/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:ANALYSIS OF COOLING EFFECTIVENESS AND HEAT TRANSFER VARIATIONS ON THE END WALL OF A NOZZLE GUIDE VANE CAUSED BY TURBINE LEAKAGE FLOWS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dannhauer, AxelAT-TUUNSPECIFIED
Date:2008
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:shrouded turbine vane, tip leakage gap, leakage ejection, secondary flow field, heat transfer, adiabatic efficiency
Event Title:ASME Turbo Expo
Event Location:Berlin, Deutschland
Event Type:international Conference
Event Dates:9. - 13. Juni 2008
Organizer:ASME
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E VG - Combustion and Gas Turbine Technologies (old)
DLR - Research area:Energy
DLR - Program:E VG - Combustion and Gas Turbine Technologies
DLR - Research theme (Project):E - Gasturbine (old)
Location: Göttingen
Institutes and Institutions:Institute of Propulsion Technology > Turbine
Deposited By: Giess, Dr.-Ing. Peter-Anton
Deposited On:25 Jun 2013 14:56
Last Modified:25 Jun 2013 14:56

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