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Modélisation du comportement dynamique couplé rotor-stator d'une turbine en situation accidentelle

Abstract : In nuclear power plant turbosets, the design-basis accident consists of a blade-off on the low pressure turbine last stage. Once the blade-off is detected, the turbine is automatically disconnected from the rest of the electrical network and the rotating machinery slows down due to surrounding fluid friction on the shaft. Therefore the main objective is to verify that the designed turbine is capable of going through critical speeds without catastrophic consequences for the shaft line during the accidental shut-down. To this end, a finite element model of a turbine has been developed to compute rotor speed transients by considering the rotating speed of the rotor as an unknown, which allows for the angular deceleration due to rubbing to be calculated in a more realistic fashion. Three models of the stator has been proposed to understand the dynamic behaviour of the casing, and the coupling of the two structures is achieved using the Lagrange multipliers method to compute the contact forces. To solve the nonlinear equations of motion, a contact algorithm has been developed and adapted for the geometry of each stator. Simulations on a simple model of turbine show that the angular speed and the bearing load are well estimated during the rotor-stator interaction. Finally the developed numerical tool is capable of studying the coupled rotor-stator response and predict the sensitivity of parameters such as the friction coefficient and the material properties of the casing.
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Contributor : Mathias Legrand <>
Submitted on : Friday, January 16, 2009 - 10:15:32 PM
Last modification on : Monday, March 25, 2019 - 4:24:08 PM
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  • HAL Id : tel-00353938, version 1



Sébastien Roques. Modélisation du comportement dynamique couplé rotor-stator d'une turbine en situation accidentelle. Mécanique []. Ecole Centrale de Nantes (ECN), 2007. Français. ⟨tel-00353938⟩



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