NDLI: Prediction of the Vibratory Behaviour of Monoblock Sectorised Stator Vanes

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Amadou, C. Sall Thouverez, Fabrice Blanc, Laurent Jean, Pierrick Ottavy, Xavier
Copyright Year	2010
Abstract	Stator vanes which are found at different stages in axial compressors are subject to major aerodynamic load fluctuations, due to cyclic excitations induced by the wakes of the rotors located upstream and also due to the pressure waves generated by the blade rows located downstream. In a vibratory fatigue context, it is important to ensure the structural strength of these stator vanes. A new technology of monoblock sectorised stator vanes has been developed to provide an easier manufacturing process and lower costs; in return, cyclic symmetry properties, which make the prediction studies easier, are lost in this case. Besides, these kinds of monoblock sectors are characterized by low damping which increases the criticality of the blade modes localization. The division into sectors of stator vanes creates a high density of eigenmodes in some short frequency ranges; this phenomenon is accompanied by non-negligible modal participations of neighbouring eigenmodes. Moreover, stator vanes sectors have shown a strong sensitivity to mistuning, making their vibratory behaviour prediction more difficult by means of deterministic prediction methods. In this paper, a phenomenological approach is followed to quantify the mistuning. Thus, several sensitivity to mistuning numerical studies were performed. They allowed to have first results about the relative predictable errors that could be done, depending on the mistuning. Some engine tests were also performed with gauges-equipped stator vanes sectors.
Sponsorship	International Gas Turbine Institute
Starting Page	931
Ending Page	937
Page Count	7
File Format	PDF
ISBN	9780791844014
DOI	10.1115/GT2010-22698
e-ISBN	9780791838723
Volume Number	Volume 6: Structures and Dynamics, Parts A and B
Conference Proceedings	ASME Turbo Expo 2010: Power for Land, Sea, and Air
Language	English
Publisher Date	2010-06-14
Publisher Place	Glasgow, UK
Access Restriction	Subscribed
Subject Keyword	Damping Blades Rotors Fatigue Compressors Density Gages Pressure Waves Engines Stress Errors Stators Fluctuations (physics) Wakes Excitation Manufacturing
Content Type	Text
Resource Type	Article

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