Etude expérimentale du contact aube/abradable : contribution à la caractérisation mécanique des matériaux abradables et de leur interaction dynamique sur banc rotatif avec une aube

Abstract : Abradable seals are extensively used in jet engines to ensure smaller rotor/stator dynamic clearances and lead to higher aerodynamic efficiencies. However, the resulting reduced rotor/stator gap can cause excessive seal wear and/or a significant increase in rotor blades solicitation, both of which can be highly detrimental to the engine's structural integrity. To allow numerical modelling of such accidental scenarios, there is a need to better comprehend the blade/seal interactions as well as the contact forces involved and that can be influenced by the couplings occurring between friction, seal wear and blade vibration.This thesis aims at contributing to a better understanding of the blade/seal interaction mechanisms, in the framework of a cooperation between ONERA de Lille and the Laboratoire de Mécanique de Lille. The abradable material is of Al-Si/hBN type (Metco 320NS), commonly used in low pressure compressors. The physicochemical properties and the mechanical behaviour - under static and dynamic loading - of this abradable material are tested. Given the anti-symmetry of its tension and compression behaviour, use of the Digital Image Correlation technique to analyze an experiment derived from the Brazilian test allows qualification of the damage mechanisms. The friction behaviour of the abradable seal is studied on a tribometer using different contact configurations. Characterisation of the blade/seal interaction and of some of the associated coupling phenomena is done on a dedicated and instrumented device developed at ONERA de Lille
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Theses
Engineering Sciences. Ecole Centrale de Lille, 2011. French. <NNT : 2011ECLI0002>


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Sarah Baïz. Etude expérimentale du contact aube/abradable : contribution à la caractérisation mécanique des matériaux abradables et de leur interaction dynamique sur banc rotatif avec une aube. Engineering Sciences. Ecole Centrale de Lille, 2011. French. <NNT : 2011ECLI0002>. <tel-00605091>

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