In the last decades the aero-engine design has been more and more focusing on reducing weight and polluting emissions, yielding a fewer number of highly loaded and thinner blades. This leads to undesired vibration phenomena, such as flutter and forced response. Flutter is a major concern to be taken into account, since it is a self-excited and self-sustained aeroelastic instability phenomenon. The development of accurate numerical prediction methods is thus necessary in order to determine, during the design loop, whether a blade-row will or will not experience flutter. This paper presents a numerical assessment of flutter stability on a low pressure turbine rotor row in two different configurations designed and tested in the context of the European project FUTURE. The analyses have been carried out on both the cantilever and interlocked configurations of a single-pitch row sector for the first bending mode family. The modal analysis has been performed with an Open Source FEM tool (CalculiX) able to deal with complex interlocked rotor geometries and to model contact interfaces by using dedicated contact models with friction. On the other hand, the unsteady CFD simulations with moving blades have been carried out with the TRAF code, an in-house solver developed at the University of Florence which implements a non-linear method for flutter evaluation. The comparison between the cantilever and interlocked configurations in terms of flutter behavior is provided, showing the stabilization effect of the blade tip interlock device. The results proved to be in good agreement with the evidence coming from the experimental campaign.
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17 December 2019
74TH ATI NATIONAL CONGRESS: Energy Conversion: Research, Innovation and Development for Industry and Territories
11–13 September 2019
Modena, Italy
Research Article|
December 17 2019
Flutter stability assessment of a low pressure turbine rotor: A comparison between cantilever and interlocked configurations
Fabrizio Lottini;
Fabrizio Lottini
a)
Department of Industrial Engineering, Università degli Studi di Firenze
, Via di Santa Marta 3, 50139 Firenze, Italy
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Francesco Poli;
Francesco Poli
Department of Industrial Engineering, Università degli Studi di Firenze
, Via di Santa Marta 3, 50139 Firenze, Italy
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Lorenzo Pinelli;
Lorenzo Pinelli
Department of Industrial Engineering, Università degli Studi di Firenze
, Via di Santa Marta 3, 50139 Firenze, Italy
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Federico Vanti;
Federico Vanti
Department of Industrial Engineering, Università degli Studi di Firenze
, Via di Santa Marta 3, 50139 Firenze, Italy
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Roberto Pacciani
Roberto Pacciani
Department of Industrial Engineering, Università degli Studi di Firenze
, Via di Santa Marta 3, 50139 Firenze, Italy
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Fabrizio Lottini
a)
Francesco Poli
Lorenzo Pinelli
Federico Vanti
Roberto Pacciani
Department of Industrial Engineering, Università degli Studi di Firenze
, Via di Santa Marta 3, 50139 Firenze, Italy
a)
Fabrizio Lottini: [email protected]
AIP Conf. Proc. 2191, 020102 (2019)
Citation
Fabrizio Lottini, Francesco Poli, Lorenzo Pinelli, Federico Vanti, Roberto Pacciani; Flutter stability assessment of a low pressure turbine rotor: A comparison between cantilever and interlocked configurations. AIP Conf. Proc. 17 December 2019; 2191 (1): 020102. https://doi.org/10.1063/1.5138835
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