Oil Film Dynamics in Aero Engine Bearing Chambers : Fundamental Investigations and Numerical Modelling.

Annotation

Detalles Bibliográficos
Clasificación:Libro Electrónico
Autor principal: Hashmi, Amir A.
Formato: Electrónico eBook
Idioma:Inglés
Publicado: Berlin : Logos Verlag Berlin, 2012.
Colección:Forschungsberichte Aus Dem Institut Für Thermische Strömungsmaschinen Ser.
Temas:
Airplanes > Motors.
Avions > Moteurs.
Airplanes > Motors
Acceso en línea:Texto completo

MARC

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100 1 |a Hashmi, Amir A. 
245 1 0 |a Oil Film Dynamics in Aero Engine Bearing Chambers :  |b Fundamental Investigations and Numerical Modelling. 
260 |a Berlin :  |b Logos Verlag Berlin,  |c 2012. 
300 |a 1 online resource (164 pages) 
336 |a text  |b txt  |2 rdacontent 
337 |a computer  |b c  |2 rdamedia 
338 |a online resource  |b cr  |2 rdacarrier 
490 1 |a Forschungsberichte Aus Dem Institut Für Thermische Strömungsmaschinen Ser. ;  |v v. 50/2012 
588 0 |a Print version record. 
505 0 |a Intro; 1 Introduction -- Bearing Chambers in Aero Engines; 2 Oil Film Dynamics -- State of the Art; 2.1 Experimental Investigations; 2.1.1 ITS High Speed Bearing Chamber (HSBC) Test Rig; 2.1.2 Stratified Flow Test Rigs; 2.2 Numerical Investigations; 2.2.1 Film Flow Modelling in Bearing Chamber (Similar) Geometries; 2.2.2 Stratified Flow Modelling; 2.2.3 Summary of Film Flow Modelling; 3 Problem Definition and Concretization of Objectives; 3.1 Problem Definition; 3.2 Scope of the Thesis; 3.3 Concretization of Objectives; 4 Experimental Investigations of Thick Film Flows. 
505 8 |a 4.1 Stratified Flow Test Rig4.1.1 Test Rig Design and Boundary Conditions; 4.1.2 Definition of a New Validation Parameter; 4.2 Experimental Results and Discussion; 4.2.1 Experimental Procedure; 4.2.2 Reproducibility Study; 4.2.3 Co-Current Flow Regime; 4.2.4 Counter-Current Flow Regime; 4.3 Significance of the Generic Results in a Bearing Chamber Environment; 4.4 Characterization of Bearing Chamber Typical Oil Film Flows; 5 Modelling of Shear Driven Thick Film Flows; 5.1 Multiphase Modelling Techniques; 5.1.1 Two-Fluid Model; 5.1.2 Homogenous Model; 5.1.3 Model Selection. 
505 8 |a 5.2 Multiphase Turbulence Modelling5.2.1 Selection of a Turbulence Model; 5.2.2 Two-Equation Turbulence Models; 5.3 Application of the VOF Model to Thick Film Flows; 5.3.1 Investigation of the Model Failure; 5.3.2 Turbulence Model Behaviour near the Interface; 5.4 Improved VOF Model; 5.4.1 Previous Approaches; 5.4.2 Interface Treatment Method; 6 Simulation Results and Discussion; 6.1 Test Case #1 -- High Viscosity Liquid; 6.2 Test Case #2 -- ITS Stratified Flow Test Rig; 6.2.1 Effect of Shearing Gas Flow; 6.2.2 Effect of Gravity; 6.2.3 Effect of Film Properties. 
505 8 |a 7 Application Oriented Test Case -- ITS HSBC Test Rig7.1 Experimental Setup; 7.2 Simulation Setup; 7.3 Validation and Analysis; 8 Summary and Outlook. 
520 8 |a Annotation  |b Aero engine bearing chambers are complex machine elements inside the engines, supporting up to three concentric shafts on bearings. For safety reasons, the aero engines always employ rolling-element type bearings and therefore require a sufficient oil supply for lubrication in order to guarantee a reliable operation. As a consequence, a complex two-phase flow consisting of oil and sealing air governs the bearing chambers. A highly dynamic oil film, flowing along the chamber walls, plays a vital role to fulfill the tasks of cooling, lubricating and cleaning the bearing chambers. The design and optimization process of the bearing chambers requires a detailed understanding in order to accurately simulate the film behaviour inside the bearing chambers. Based on the earlier experimental investigations, it is known that near the scavenge off-take a relatively thick film exists. The numerical model to simulate these films must therefore take into account the elliptical behaviour of such films. Among the different models, the Volume Of Fluid (VOF) Model offers the best compromise between accuracy and efforts. However, preliminary attempts to model a fully developed and turbulent test case from literature revealed an unphysical pressure drop and velocity profile in the gas phase above the film flow. An inadequate turbulence modelling near the gas-liquid interface was identified as the problem source. The 2-Equation turbulence models (k- epsilon & k- omega) were extended to achieve a substantial improvement. 
590 |a ProQuest Ebook Central  |b Ebook Central Academic Complete 
650 0 |a Airplanes  |x Motors. 
650 6 |a Avions  |x Moteurs. 
650 7 |a Airplanes  |x Motors  |2 fast 
758 |i has work:  |a Oil film dynamics in aero engine bearing chambers (Text)  |1 https://id.oclc.org/worldcat/entity/E39PCGVp66HV6MT7tjyb7KpHG3  |4 https://id.oclc.org/worldcat/ontology/hasWork 
776 0 8 |i Print version:  |a Hashmi, Amir A.  |t Oil Film Dynamics in Aero Engine Bearing Chambers : Fundamental Investigations and Numerical Modelling.  |d Berlin : Logos Verlag Berlin, ©2012  |z 9783832532284 
830 0 |a Forschungsberichte Aus Dem Institut Für Thermische Strömungsmaschinen Ser. 
856 4 0 |u https://ebookcentral.uam.elogim.com/lib/uam-ebooks/detail.action?docID=5247164  |z Texto completo 
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938 |a YBP Library Services  |b YANK  |n 15138814 
994 |a 92  |b IZTAP 

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