Numerical Study of Oil Mist Flow in Thick Film

il y a 3 semaines


Bordeaux, France Institut PPRIME Temps plein

**Numerical study of oil mist flow in thick film**:

- Réf
- **ABG-111745**
- Sujet de Thèse- 06/03/2023- Contrat doctoral- Institut PPRIME- Lieu de travail- Angouleme - Nouvelle Aquitaine - France- Intitulé du sujet- Numerical study of oil mist flow in thick film- Champs scientifiques- Sciences de l’ingénieur
- Numérique
- Mots clés- Mécanique des fluides, Simulation numérique, modélisation, FEM, CFD, Fortran**Description du sujet**:

- The internship is part of the industrial chair AeroSeal carried by the Pprime Institute that meets the needs formulated by Safran Aircraft Engines, Safran Transmission Systems and Cetim, 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.Ce sujet de la thèse s’inscrit dans le cadre de la chaire industrielle AeroSeal portée par l’Institut Pprime et qui répond aux besoins formulés par Safran Aircraft Engines, Safran Transmission Systems et le Cetim visant à approfondir la maîtrise du fonctionnement des systèmes d'étanchéité aéronautiques.

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.

**Duration**:36 months.

**Profile**

Student in final year of engineering school or master 2 in fluid mechanics, numerical modeling and simulation (finite elements).

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.

**Location** : Pprime Institute, site of the IUT of Angoulême (France)

**Nature du financement**:

- Contrat doctoral**Précisions sur le financement**:
**Présentation établissement et labo d'accueil**:

- Institut PPRIMEThe P' Institut is a research laboratory in the fields of Physical Sciences and Engineering Sciences. It is a CNRS UPR conventionally associated with the University of Poitiers (Faculty of Fundamental and Applied Sciences, Faculty of Sports Sciences and National Higher School of Engineering of Poitiers, ENSIP) and the National Higher School of Mechanics and Aeronautics, ISAE-ENSMA.

**Site web**:
**Intitulé du doctorat**:

- Numerical study of oil mist flow in thick film**Pays d'obtention du doctorat**:

- France**Etablissement délivrant le doctorat**:

- UNIVERSITE DE POITIERSÉtudiant en dernière année d’école d'ingénieur ou master 2 en mécanique des fluides/ modélisation numérique et simulation.

**_Connaissances fortement appréciées_**
- Maitrise des outils de CFD, notamment Ansys Fluent ou OpenFoam.
- Maîtrise des techniques de programmation (éléments finis/volumes finis).
- Connaissances théoriques en lubrification
- Expérience en modélisation numérique- 07/04/2023



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