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Time-domain harmonic balance method for aerodynamic and aeroelastic simulations of turbomachinery flows

Sicot, Frédéric and Guédeney, Thomas and Dufour, Guillaume Time-domain harmonic balance method for aerodynamic and aeroelastic simulations of turbomachinery flows. (2013) International Journal of Computational Fluid Dynamics, 27 (2). 68-78. ISSN 1061-8562

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Official URL: http://dx.doi.org/10.1080/10618562.2012.740021

Abstract

A time-domain Harmonic Balance method is applied to simulate the blade row interactions and vibrations of state- of-the-art industrial turbomachinery configurations. The present harmonic balance approach is a time-integration scheme that turns a periodic or almost-periodic flow problem into the coupled resolution of several steady computations at different time samples of the period of interest. The coupling is performed by a spectral time-derivative operator that appears as a source term of all the steady problems. These are converged simultaneously making the method parallel in time. In this paper, a non-uniform time sampling is used to improve the robustness and accuracy regardless of the considered frequency set. Blade row interactions are studied within a 3.5-stage high-pressure axial compressor representative of the high-pressure core of modern turbofan engines. Comparisons with reference time-accurate computations show that four frequencies allow a fair match of the compressor performance, with a reduction of the computational time up to a factor 30. Finally, an aeroelastic study is performed for a counter-rotating fan stage, where the rear blade is submitted to a prescribed harmonic vibration along its first torsion mode. The aerodynamic damping is analysed, showing possible flutter.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > SAFRAN (FRANCE)
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Deposited By: Guillaume Dufour
Deposited On:11 Apr 2013 08:42

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