Étude expérimentale des interactions aube-abradable à très grandes vitesses : influence du matériau et de sa microstructure

Abstract : The turbofan efficiency can be improved by minimizing the blade-casing gap, thus reducing the aerodynamic loss. The reduced gap conduces to contact risk between the high-speed rotating blades and the engine case. Sacrificial materials, called abradable materials, are deposited on the casing to limit the damage caused by these contacts. These interactions involve a lot of damage mechanisms, which can be adverse or beneficial to the proper performance of the abradable seal and to the reliability of the engine. The aim of this thesis is to understand, predict and quantify the different damages and the interaction forces associated for abradable materials obtained with different process parameters. A triaxial dynamometer was developed to reproduce the local high-speed interactions (50 – 300 m/s) between the blade tip and the abradable material during transitional phases. The interaction forces measurement during short-lived contacts (300 µs – 1 ms) requires a large bandwidth. A correction method based on experimental modal analysis was implemented to extend the natural bandwidth of the device and attenuate the crosstalk between the different measurement channels. The damage mechanisms of abradable materials were studied by post-mortem analysis and correlated to the interaction forces and velocity.
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  • HAL Id : tel-02331829, version 1

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Julien Vincent. Étude expérimentale des interactions aube-abradable à très grandes vitesses : influence du matériau et de sa microstructure. Science des matériaux [cond-mat.mtrl-sci]. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0334⟩. ⟨tel-02331829⟩

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