Faculté des Sciences appliquées
Faculté des Sciences appliquées

Master thesis and internship[BR]- Master's Thesis : Reynolds number effects in low-pressure compressors[BR]- Internship (linked to master's thesis)

Delvaux, Grégory ULiège
Promotor(s) : Hillewaert, Koen ULiège
Date of defense : 7-Sep-2020/9-Sep-2020 • Permalink :
Title : Master thesis and internship[BR]- Master's Thesis : Reynolds number effects in low-pressure compressors[BR]- Internship (linked to master's thesis)
Translated title : [fr] Effets de la variation du nombre de Reynolds au sein d'un compresseur basse pression
Author : Delvaux, Grégory ULiège
Date of defense  : 7-Sep-2020/9-Sep-2020
Advisor(s) : Hillewaert, Koen ULiège
Committee's member(s) : Bartholet, Jules 
Terrapon, Vincent ULiège
Language : English
Number of pages : 114
Keywords : [en] Reynolds number
[en] Compressor
[en] Experiments
[en] Boundary layer
[en] Aerodynamic blockage
Discipline(s) : Engineering, computing & technology > Aerospace & aeronautics engineering
Funders : Safran Aero Boosters
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


[en] The performance of a compressor measured in flight differs from that measured on the ground. One of the main reasons for these differences is associated to the inlet Reynolds number variation. In view of the fact that in-flight testing involves a risk to the equipment, the flight instrumentation is limited to what is strictly necessary to determine compressor performance while the equipment for ground engine tests is extensive. Given the great abundance of data on the ground, the CFD calculations are therefore calibrated on it. The aim of this work is therefore to identify and understand these Reynolds effects, then to be able to quantify them so that corrections on data measured on the ground (at high Reynolds) can be applied to predict the compressor performance in flight (at low Reynolds).

The understanding of Reynolds effects is approached step by step. As a first step, the Reynolds number effects on performance of a two-dimensional compressor cascade are investigated. It results that the variation in performance due to Reynolds number is closely linked to the boundary layer development and the transitional phenomenon. Therefore, empirical methods are applied on published data to attempt to quantify these effects. As a second step, a description of the three-dimensional flows that are encountered in compressor cascade and their influence on cascade sensitivity to Reynolds number variation are included. In the last step, the Reynolds number effects in multistage axial-flow compressor are physically described on compressor characteristic operating at design rotation speed. The variation in performance when the Reynolds number changes might be interpreted in terms of viscous losses, aerodynamic blockage level and mismatching within the compressor. Finally, two Reynolds number corrections available in the literature are physically described with the effects previously identified. To illustrate how they are used, they are applied to experimental data and the results encourage the reuse of these corrections on other data sets.



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  • Delvaux, Grégory ULiège Université de Liège > Master ingé. civ. aérospat., à fin.


Committee's member(s)

  • Bartholet, Jules Safran Aero Boosters
  • Terrapon, Vincent ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Modélisation et contrôle des écoulements turbulents
    ORBi View his publications on ORBi
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