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Experimental Analysis of the Unsteady, Turbulent Flow through the Fan Stage of a High-Bypass Turbofan in Windmilling Conditions

Thacker, Adrien and Garcia Rosa, Nicolas and Dufour, Guillaume Experimental Analysis of the Unsteady, Turbulent Flow through the Fan Stage of a High-Bypass Turbofan in Windmilling Conditions. (2017) In: 12th European Conference on Turbomachinery Fluid dynamics and thermodynamics ETC12, 3 April 2017 - 7 April 2017 (Stockholm, Sweden).

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Abstract

A detailed study of the unsteady airflow through the fan stage of a bypass turbofan is pro- posed. Experiments are conducted in the turbofan test facility of ISAE, specially suited to reproduce windmilling operation in an ambient ground setup. Hot-wire anemometry is used to obtain steady Mach number and flow angle profiles as well as to characterize the unsteady, turbulent flow, at different stations across the fan stage (fan inlet, outlet and rotor/stator interface). Phase averaging of unsteady signals and integral length scale estimations provide further evidence of the presence of a vortex shedding from the stator, as well as the fact that it is correlated to the rotor blade passing frequency. Self-similarity of mean Mach number, flow angle and turbulent intensity profiles is observed. Furthermore, turbulent scale profiles are found to scale well with blade passing period.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
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Deposited By: Nicolás García Rosa
Deposited On:27 Apr 2017 11:01

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