CUED Publications database

Unsteady flow evolution through a turning midturbine frame Part 2: Spectral analysis

Lengani, D and Spataro, R and Peterleithner, J and Göttlich, E (2015) Unsteady flow evolution through a turning midturbine frame Part 2: Spectral analysis. Journal of Propulsion and Power, 31. pp. 1597-1606. ISSN 0748-4658

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© 2015 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. This paper analyzes the propagation of the aerodynamic deterministic stresses through a two-spool counterrotating transonic turbine at Graz University of Technology. The test setup consists of a high-pressure stage, a diffusing midturbine frame with turning struts and a counter-rotating low-pressure rotor. The discussion of the data is carried out in this second part paper on the basis of spectral analysis. The theoretical framework for a double Fourier decomposition, in time and space, is introduced and discussed. The aim of the paper is the identification of the sources of deterministic stresses that propagate through the turbine.Afast-response aerodynamic pressure probe has been employed to provide time-resolved data downstream of the high-pressure rotor and of the turning strut. The fastresponse aerodynamic pressure probe measurements were acquired together with a reference signal (a laser vibrometer) downstream of the high-pressure rotor to identify different sources of deterministic fluctuations. The discussion is completed by fast-response pressure measurements on the strut surface and computational fluid dynamics computation to detail which deterministic stress related to the high-pressure stage propagates through the duct. The double Fourier decomposition shows that structures at the periodicity of the rotor blade number decay, whereas the unsteadiness at the outlet of the duct is the result of vane-rotor-vane interaction.

Item Type: Article
Divisions: Div A > Turbomachinery
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:40
Last Modified: 23 Nov 2017 04:16