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High frequency blade surface temperature determination using surface mounted hotfilm gauges

Tiedemann, M. (2000) High frequency blade surface temperature determination using surface mounted hotfilm gauges. XVth Bi-Annual Symposium on Measuring Techniques in Transonic and Supersonic Flows in Cascades and Turbomachines, Florence, 21.-22. September 2000, Florenz.

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Kurzfassung

This paper describes an attempt to determine total temperature fluctuations on the surfaces of the rotor of a transonic high pressure turbine stage. The gathered results were used to evaluate the error that these fluctuations cause in the constant temperature anemometer output signal of surface mounted hotfilms. As the temperature variations in turbomachines occur at frequencies in the order of the blade passing frequency (usually several kHz), it is in most cases not feasible to measure the surface temperature directly. Therefore, an indirect method was developed which determines the temperature fluctuations from the results of two different hotfilm tests. Even though the results are subject to severe errors, the method provides interesting information on the nature of the temperature fluctuations on the blade surfaces. The results show, that in the investigated case of a transonic turbine rotor, the temperature variations did not have a significant effect on the qualitative wall shear stress. However, this might be entirely different in other set-ups, particularly when measurements are performed downstream of turbomachinery rotors.

Dokumentart:Konferenzbeitrag (Paper)
Zusätzliche Informationen: LIDO-Berichtsjahr=2001,
Titel:High frequency blade surface temperature determination using surface mounted hotfilm gauges
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Tiedemann, M.NICHT SPEZIFIZIERT
Datum:2000
Status:veröffentlicht
Stichwörter:hotfilm, temperature
Veranstaltungstitel:XVth Bi-Annual Symposium on Measuring Techniques in Transonic and Supersonic Flows in Cascades and Turbomachines, Florence, 21.-22. September 2000
Veranstaltungsort:Florenz
Veranstaltungsart:internationale Konferenz
Veranstalter :University of Florence
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:keine Zuordnung
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L TT - Triebwerkstechnologien
DLR - Teilgebiet (Projekt, Vorhaben):L - Turbinentechnologien
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik
Hinterlegt von: elib DLR-Beauftragter
Hinterlegt am:16 Sep 2005
Letzte Änderung:06 Jan 2010 13:11

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