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Flutter Analysis of a Transonic Steam Turbine Blade with Frequency and Time-Domain Solvers

Institute of Propulsion Technology, German Aerospace Center (DLR), Linder Höhe, 51147 Köln, Germany
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This paper is an extended version of our paper in Proceedings of the 13th European Turbomachinery Conference on Fluid Dynamics & Thermodynamics ETC13, Lausanne, Switzerland, 8–12 April 2019. Paper No. 32.
Int. J. Turbomach. Propuls. Power 2019, 4(2), 15; https://doi.org/10.3390/ijtpp4020015
Received: 10 May 2019 / Revised: 16 May 2019 / Accepted: 17 May 2019 / Published: 12 June 2019
The aim of this study was to assess the capabilities of different simulation approaches to predict the flutter stability of a steam turbine rotor. The focus here was on linear and nonlinear frequency domain solvers in combination with the energy method, which is widely used for the prediction of flutter onset. Whereas a GMRES solver was used for the linear problem, the nonlinear methods employed a time-marching procedure. The solvers were applied to the flutter analysis of the first rotor bending mode of the open Durham Steam Turbine test case. This test case is representative of the last stage of modern industrial steam turbines. We compared our results to those published by other researchers in terms of aerodynamic damping and local work per cycle coefficients. Time-domain, harmonic balance, and time-linearised methods were compared to each other in terms of CPU efficiency and accuracy. View Full-Text
Keywords: steam turbine; flutter; transonic flows; frequency-domain solvers steam turbine; flutter; transonic flows; frequency-domain solvers
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Frey, C.; Ashcroft, G.; Kersken, H.-P.; Schlüß, D. Flutter Analysis of a Transonic Steam Turbine Blade with Frequency and Time-Domain Solvers. Int. J. Turbomach. Propuls. Power 2019, 4, 15.

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