Faculté des Sciences appliquées
Faculté des Sciences appliquées

Development of a methodology for VLEO intake performance testing in a low density facility

Brabants, Coralie ULiège
Promotor(s) : Hillewaert, Koen ULiège
Date of defense : 24-Jun-2021/25-Jun-2021 • Permalink :
Title : Development of a methodology for VLEO intake performance testing in a low density facility
Author : Brabants, Coralie ULiège
Date of defense  : 24-Jun-2021/25-Jun-2021
Advisor(s) : Hillewaert, Koen ULiège
Committee's member(s) : Dewallef, Pierre ULiège
Magin, Thierry ULiège
Language : English
Discipline(s) : Engineering, computing & technology > Aerospace & aeronautics engineering
Research unit : Von Karman Institut
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 objective of this thesis is to design a test procedure within a high vacuum installation with the aim of providing the transmissivity to a fast flux of particles. This parameter is of paramount importance to the evaluation of the intake performance.

First, the pressure evolution within the two chambers of the installation is simulated based on a 0-D model implemented in MATLAB. The model is based on kinetic theory and determines an expression for all the flows circulating in the vacuum facility.
It allows defining the various factors impacting the facility operation and the relevant intake perfomance parameters.

Then, a series of tests is proposed. These are required to determine all facility operational parameters which are not measurable directly or within a single test. Two assumptions are considered to determine the intake performance. We will show that one can provide slightly more precise measurements than the other

Finally, an analysis of the error propagation is realized to estimate the uncertainty of the test results.
The large uncertainties associated with some of the tests increase the uncertainty associated to the fast flux transmissivity estimative.
This uncertainty depends not only on the analytical reasoning chosen but also on the configuration.
The developed 0-D model and uncertainty propagation will be used in the future to assist in the configuration definition of the VKI low density facility. Moreover, the 0-D model will be valuable to retrieve the relevant transmissivities from interpretation of each chamber pressure.



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  • Brabants, Coralie ULiège Université de Liège > Master ingé. civ. aérospat., à fin.


Committee's member(s)

  • Dewallef, Pierre ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes de conversion d'énergie pour un dévelop.durable
    ORBi View his publications on ORBi
  • Magin, Thierry ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Département d'aérospatiale et mécanique
    ORBi View his publications on ORBi
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