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Faculté des Sciences appliquées
Faculté des Sciences appliquées
MASTER THESIS
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Metamodeling for aerodynamic optimisation of a low-pressure compressor blade

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Levaux, Nayan ULiège
Promotor(s) : Terrapon, Vincent ULiège
Date of defense : 9-Sep-2019/10-Sep-2019 • Permalink : http://hdl.handle.net/2268.2/8203
Details
Title : Metamodeling for aerodynamic optimisation of a low-pressure compressor blade
Translated title : [fr] Métamodélisation d'aubage de compresseur basse-pression pour optimisation aérodynamique
Author : Levaux, Nayan ULiège
Date of defense  : 9-Sep-2019/10-Sep-2019
Advisor(s) : Terrapon, Vincent ULiège
Committee's member(s) : Ponthot, Jean-Philippe ULiège
Terrapon, Vincent ULiège
Duysinx, Pierre ULiège
Nigro, Rémy 
Language : English
Number of pages : 97
Keywords : [en] Metamodeling
[en] Optimisation
[en] Aerodynamics
[en] Booster
Discipline(s) : Engineering, computing & technology > Aerospace & aeronautics engineering
Target public : Researchers
Professionals of domain
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 company Safran Aero Boosters for which this master thesis was conducted is the world leader in conception of low-pressure compressors, also called boosters, for commercial turbofan engines. In a search of continued improvement, the engineers of the company are regularly confronted to the aerodynamic design of blades, a time consuming iterative procedure between the aerodynamics and mechanical teams. Within the conception process, the design space exploration consists in carrying out small modifications to a reference blade and then reassess its performances with long running CFD computations until finding the optimal one. In order to spare computational cost and time, metamodels could be used instead. Constructed on a limited database obtained with CFD computations, the metamodels give predictions on blade performances in an instant and can be intensively employed with optimisation algorithms.

The main objective of this master thesis is to gain experience in the optimal construction of metamodels. In this context, highly predictive metamodels have been constructed on a large database and the relationships between the design variables modifications and blade performances analysed. In an attempt to reduce the computational cost associated to the creation of metamodels, a comparison of their predictability was made when they are constructed on alternative databases of reduced size. This study concluded that a database of 20 elements obtained with the Latin Hypercube sampling method appeared to be the most adequate choice in this application.

After that, an enlargement of the design space was considered as modifications on the initial blade induced changes in other design variables. This enlarged design space was once again explored with the metamodels constructed this time with a reduced size database, result of the previous comparison, and with CFD computations on a smaller domain. In fact, with the reduced domain, the blades too different from the initial one encountered issues in convergence of their CFD computations. Nevertheless, the surrogate models were sufficiently predictive for this work and optimised blades were determined. Among those ones, the blade for which was predicted an improvement of both efficiency and operability satisfied all expectations. To finish this thesis, an analysis of the flow around these optimised blades was conducted in order to better understand the reasons behind the performances improvement with the blade geometry modifications.


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Author

  • Levaux, Nayan ULiège Université de Liège > Master ingé. civ. aérospat., à fin.

Promotor(s)

Committee's member(s)

  • Ponthot, Jean-Philippe ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > LTAS-Mécanique numérique non linéaire
    ORBi View his publications on ORBi
  • Terrapon, Vincent ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Modélisation et contrôle des écoulements turbulents
    ORBi View his publications on ORBi
  • Duysinx, Pierre ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Ingénierie des véhicules terrestres
    ORBi View his publications on ORBi
  • Nigro, Rémy Safran Aero Boosters > Département d'aérodynamique
  • Total number of views 79
  • Total number of downloads 7










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