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PhD contract : Numerical study of oil mist flow in thick film (M/F)

This offer is available in the following languages:
- Français-- Anglais

Date Limite Candidature : vendredi 21 avril 2023

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Informations générales

Intitulé de l'offre : PhD contract : Numerical study of oil mist flow in thick film (M/F) (H/F)
Référence : UPR3346-NADMAA-081
Nombre de Postes : 1
Lieu de travail : ANGOULEME
Date de publication : mercredi 1 mars 2023
Type de contrat : CDD Doctorant/Contrat doctoral
Durée du contrat : 36 mois
Date de début de la thèse : 1 mai 2023
Quotité de travail : Temps complet
Rémunération : 2 135,00 € gross monthly
Section(s) CN : Material and structural engineering, solid mechanics, biomechanics, acoustics

Description du sujet de thèse

The CNRS, within the Pprime Institute, on the Futuroscope site, as part of the AeroSeal industrial chair, which meets the needs formulated by Safran Aircraft Engines, Safran Transmission Systems and Cetim, is recruiting a doctoral student
aiming at improving the knowledge of aeronautical sealing systems.

Oil mist lubrication is a lubrication technology that offers increased reliability to many types of rotating equipment. It involves spraying oil in small droplets, then transporting and delivering sufficient quantities of oil to bearings, seals and rotating surfaces. It improves the lubrication process, reduces frictional losses and extends the life of the machines.

The main objective of the thesis is to provide a means of quantifying the effectiveness of seals, supplied by oil-contaminated air. The study must be carried out by combining both numerical approaches and experimental investigations necessary to understand the phenomena at the lubricated interfaces.

Numerically, the thesis is a continuation of a master internship whose objective was the CFD simulation of oil mist. The student will study the possibility to model the fragmentation and coalescence of droplets with a low computational cost using a thin film model and will develop a model to predict the dynamics of the oil mist. The numerical model will be validated by comparison with CFD calculations and experimental results.

Experimentally, a test device for the study of seals exists but will have to be adapted to oil mist lubrication. Two types of tests are considered: visualization tests and characterization tests. The visualization tests will be carried out with a transparent cell. The use of specific techniques (PIV, fast camera) will allow the observation of the flow of oil droplets and the understanding of the influence of several factors (composition of the air/fluid mixture, pressure to be sealed, geometry of the interface, local Reynolds number, etc.). In addition, a second steel test cell will have to reproduce the operating conditions. Instrumentation in temperature, pressure, speed, flow, etc. will allow to characterize the behavior of the seal.

Contexte de travail

The Pprime Institute is a research laboratory in the fields of Physical Sciences and Engineering Sciences. It is a CNRS UPR under agreement with the University of Poitiers (Faculty of Fundamental and Applied Sciences, Faculty of Sports Sciences and the École Nationale Supérieure d'Ingénieurs de Poitiers, ENSIP) and the École Nationale Supérieure de Mécanique et d'Aérotechnique, ISAE-ENSMA.

The PhD student will work in the Mechanical Engineering and Complex Systems Research Department in the TriboLub team (Mechanics of Lubricated Interfaces).

The PhD student will be based at the Pprime Institute in the premises of the IUT in Angoulême (16).

Contraintes et risques

Short-term travel in France and abroad is to be expected.

Informations complémentaires

The candidate should have a Master's degree or an engineering degree in fluid mechanics/modelling and simulation (finite elements).

The following knowledge would be highly appreciated:
- Experience with CFD tools, in particular Ansys Fluent or OpenFoam
- Familiarity with finite element/finite volume programming on Fortran
- Theoretical knowledge in thin film lubrication
- Experience in numerical modelling

The PhD student will be registered at the University of Poitiers' doctoral school (MIMME).