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Faculté des Sciences appliquées
Faculté des Sciences appliquées
MASTER THESIS
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Study and Comparison of Different Models for Rotor-Stator Interaction in a Low-Pressure Compressor

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Abeloos, Gaëtan ULiège
Promotor(s) : Ponthot, Jean-Philippe ULiège
Date of defense : 25-Jun-2018/26-Jun-2018 • Permalink : http://hdl.handle.net/2268.2/4587
Details
Title : Study and Comparison of Different Models for Rotor-Stator Interaction in a Low-Pressure Compressor
Translated title : [fr] Étude et comparaison de différents modèles pour l'interaction rotor-stator dans un compresseur basse-pression
Author : Abeloos, Gaëtan ULiège
Date of defense  : 25-Jun-2018/26-Jun-2018
Advisor(s) : Ponthot, Jean-Philippe ULiège
Committee's member(s) : Pacyna, Laura 
Golinval, Jean-Claude ULiège
Kerschen, Gaëtan ULiège
Language : English
Number of pages : 157
Keywords : [en] metafor
[en] ls-dyna
[en] dyna
[en] interaction
[en] rotor
[en] stator
[en] compressor
[en] wear
[en] contact
[en] divergence
[en] vibration
[en] safran
[en] aero
[en] boosters
[en] booster
[en] engine
[en] low
[en] pressure
[en] onera
[en] model
[en] finite
[en] elements
[en] nonlinear
[en] explicit
[en] implicit
[en] time
[en] integration
[en] solver
[en] gap
[en] close
[en] open
[en] abradable
[en] material
Discipline(s) : Engineering, computing & technology > Aerospace & aeronautics engineering
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en ingénieur civil en aérospatiale, à finalité spécialisée en "aerospace engineering"
Faculty: Master thesis of the Faculté des Sciences appliquées

Abstract

[en] The recent implementation of wear models in the nonlinear solver LS-Dyna allows its use in the numerical simulation of Rotor-Stator Interaction for the very first time. The new capabilities of the solver are studied and are compared to the ones of nonlinear solver Metafor, already capable of simulating Rotor-Stator Interaction. Specifically, the feasibility of such simulations is studied, the best suited contact algorithms are selected, and the performance is assessed. To that end, two LS-Dyna models are developed: a basic ONERA test bench whose purpose is to select the most adequate contact models, and a compressor blade rub test whose purpose is to ensure the correct application of wear on the finite elements model. The choice of contact model is constrained by the limited support of wear in the solver. Penalty methods for contact were considered, double-pass algorithms were rejected due to high variation of contact loads, leaving single-pass algorithms. The penalty computation was selected to ensure the least dependence on the mesh. Soft constraint formulation is not fully independent of the mesh, but offers nodal mass normalization. The specificity of wear computation in LS-Dyna is its application in post-processing only, preventing wear affecting the compressor blade dynamics. The simulation of Rotor-Stator Interaction in LS-Dyna thus necessitates extensive use of computation stops and restarts. A fully functional method to compute Rotor-Stator Interaction was successfully developed for LS-Dyna, with performance similar to Metafor.


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Author

  • Abeloos, Gaëtan ULiège Université de Liège > Master ingé. civ. aérospat., à fin.

Promotor(s)

Committee's member(s)

  • Pacyna, Laura Safran Aero Boosters > Computation Engineering
  • Golinval, Jean-Claude ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > LTAS - Vibrations et identification des structures
    ORBi View his publications on ORBi
  • Kerschen, Gaëtan ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
    ORBi View his publications on ORBi
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  • Total number of downloads 50










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