Thermomechanical model reduction for efficient simulations of rotor-stator contact interaction

Nicolas Guérin (1, 2) , Anders Thorin (3) , Fabrice Thouverez (1) , Mathias Legrand (3) , Patricio Almeida (2)

1 LTDS - Laboratoire de Tribologie et Dynamique des Systèmes
2 Safran Helicopter Engines
3 Department of Mechanical Engineering [Montréal]

Turbomachinery rotor-stator unilateral contact induced interactions play a growing role in lifecycle analysis and thus motivate the use of accurate numerical prediction tools. Recent literature confirmed by ongoing in-house experiments have shown the importance of thermomechanical coupling effects in such interactions. However, most available (possibly reduced-order) models are restricted to the sole mechanical aspects. This work describes a reduction technique of thermomechanical models involving unilateral contact and frictional contact occurrences between rotor and stator components. The proposed methodology is grounded on Guyan and Craig-Bampton methods for the reduction of the structural dynamics in conjunction with Krylov subspace techniques, and specifically the Craig-Hale approach, for the reduction of the thermal equations. The method has the capability to drastically reduce the size of the model while preserving accuracy. It stands as a reliable strategy to perform simulations of thermomechanical models with localized mechanical and thermal loads.

Mots clés: thermomechanical coupling; impeller; model order reduction; component mode synthesis; rotor-stator interaction; Krylov subspace method

Domaines: Mécanique des structures [physics.class-ph]; Thermique [physics.class-ph]

Nicolas Guérin, Anders Thorin, Fabrice Thouverez, Mathias Legrand, Patricio Almeida. Thermomechanical model reduction for efficient simulations of rotor-stator contact interaction. ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, Jun 2018, Oslo, Norway. ⟨10.1115/GT2018-75880⟩. ⟨hal-01713849⟩