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Investigation of aerodynamic effects of coolant ejection at the trailing edge of a turbine blade model by PIV and pressure measurements

Raffel, M. und Kost, F. (1998) Investigation of aerodynamic effects of coolant ejection at the trailing edge of a turbine blade model by PIV and pressure measurements. Experiments in Fluids, 24, Seiten 447-461.

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Kurzfassung

In order to simulate the thick trailing edges of turbine blades a slotted plate profile together with a newly designed nozzel was installed into the high-speed wind tunnel of the DLR Goettingen At different supersonic Mach numbers and at four coolant flow rates in the range of 0-2.5% pressure distribution measurements and probe measurements were performed. The flow field was visualized by schlieren photos and the instantaneous velocity field was quantitatively investigated by Particle Image Velocimetry (PIV). The measurements of the velocity field gave an insight into stationary effects, for example the change of shock strength with coolant flow rate, and instationary effects such as the existence of a vortex street in the wake. The PIV technique offers special advantages for the investigation of transonic flow fields, but also yields to special experimental difficulties, which are also describle in this article. Measured losses display a maximum at the downstream Mach number 1. This is strongly related to the behaviour of the base pressure. A loss minimum is achieved at moderate coolant flow rates, showing that an optimum coolant flow rate exists. The loss was analysed and separated into the loss contributions from the profile upstream of the trailing edge and the mixing loss due to the coolant flow.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen: LIDO-Berichtsjahr=1998,
Titel:Investigation of aerodynamic effects of coolant ejection at the trailing edge of a turbine blade model by PIV and pressure measurements
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Raffel, M.NICHT SPEZIFIZIERT
Kost, F.NICHT SPEZIFIZIERT
Datum:1998
Erschienen in:Experiments in Fluids
Referierte Publikation:Ja
In ISI Web of Science:Ja
Band:24
Seitenbereich:Seiten 447-461
Status:veröffentlicht
Stichwörter:turbine blades, supersonic Mach numbers,Particle Image Velocimetry (PIV),trailing edge, coolant flow.
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:keine Zuordnung
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L DT - Drehflüglertechnologien
DLR - Teilgebiet (Projekt, Vorhaben):NICHT SPEZIFIZIERT
Standort: Köln-Porz , Braunschweig , Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Institut für Strömungsmechanik > Institut für Theoretische Strömungsmechanik
Hinterlegt von: elib DLR-Beauftragter
Hinterlegt am:03 Apr 2006
Letzte Änderung:27 Apr 2009 10:36

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