Computational Modelling Of Two Phase Air Oil Flow Within An Aero Engine Bearing Chamber
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Computational Modelling Of Two Phase Air Oil Flow Within An Aero Engine Bearing Chamber
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Author : M. B. Farrall
language : en
Publisher:
Release Date : 2001
Computational Modelling Of Two Phase Air Oil Flow Within An Aero Engine Bearing Chamber written by M. B. Farrall and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Fluid mechanics categories.
Oil Film Dynamics In Aero Engine Bearing Chambers
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Author : Amir Aleem Hashmi
language : en
Publisher: Logos Verlag Berlin GmbH
Release Date : 2012
Oil Film Dynamics In Aero Engine Bearing Chambers written by Amir Aleem Hashmi and has been published by Logos Verlag Berlin GmbH this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Science categories.
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.
Oil Droplet Impact Dynamics In Aero Engine Bearing Chambers Correlations Derived From Direct Numerical Simulations
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Author : Davide Peduto
language : en
Publisher: Logos Verlag Berlin GmbH
Release Date : 2015-06-30
Oil Droplet Impact Dynamics In Aero Engine Bearing Chambers Correlations Derived From Direct Numerical Simulations written by Davide Peduto and has been published by Logos Verlag Berlin GmbH this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-06-30 with Science categories.
Bearing Chambers in Aero-Engines are located near the rolling-element type of bearings which support the shafts and accomodate the resulting thrust loads. One of the main task of the bearing chambers is, beside an efficient scavenging of the lubricating oil, the cooling of the hot compartments. A very complex two-phase air-oil flow takes usually place in these bearing chambers consisting of oil droplet-laden air flows and shear-driven liquid wall films. The interaction of the droplets with the wall films is significantly influencing the wall heat transfer and the cooling performance of these systems. For this reason, a detailed characterization and modelling of the mass and momentum exchange between droplets and wall films for the unique impingement parameter range in bearing chambers is inevitable. This scientific report investigates the oil droplet impact dynamics for typical impingement regimes relevant to aero-engine bearing chambers. The application of a Direct Numerical Simulation (DNS) technique based on the Volume-of-Fluid (VOF) method and coupled with a gradient-based adaptive mesh refinement (AMR) technique allowed to characterize the drop impact dynamics during various single micro- and millimeter drop impacts onto thin and thick films. With the help of a special numerical treatment, a self-perturbing mechanism is installed that leads to the correct resolution of the crown disintegration process. The numerical methodology was thoroughly validated using the experimental results of millimeter sized drop impacts onto deep liquid pools. These results were developed with an enhanced back-illuminated high-speed imaging and Particle Tracking Velocimetry (PTV) technique. New insights into the cavity penetration, the crown's breakup dynamics and the secondary droplet characteristics following a single drop impact have been developed with the help of the isolated variation of different parameters of influence. Particularly the influence of the Froude number, the impingement angle, and the cavity-wall interaction delivered results to date not reported in scientific literature. Beside the advances in fundamental physics describing the drop impact dynamics with the help of the numerical and experimental results, a set of correlations could also be derived. From these correlations, a drop-film interaction model was formulated that is suitable for the parameter range found in bearing chambers.
Oil Film Dynamics In Aero Engine Bearing Chambers
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Author : Amir A. Hashmi
language : en
Publisher:
Release Date : 2012
Oil Film Dynamics In Aero Engine Bearing Chambers written by Amir A. Hashmi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Electronic book categories.
Annotation 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.
Computational Technologies For Fluid Thermal Structural Chemical Systems With Industrial Applications
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Author :
language : en
Publisher:
Release Date : 2002
Computational Technologies For Fluid Thermal Structural Chemical Systems With Industrial Applications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Fluid dynamics categories.
Asme Technical Papers
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Author :
language : en
Publisher:
Release Date : 1996
Asme Technical Papers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Mechanical engineering categories.
Paper
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Author :
language : en
Publisher:
Release Date : 1996
Paper written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Mechanical engineering categories.
Journal Of Engineering For Gas Turbines And Power
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Author :
language : en
Publisher:
Release Date : 2008
Journal Of Engineering For Gas Turbines And Power written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Gas-turbines categories.
Heat And Mass Transfer
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Author :
language : en
Publisher: BoD – Books on Demand
Release Date : 2019-09-11
Heat And Mass Transfer written by and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-09-11 with Science categories.
Heat and mass transfer is the core science for many industrial processes as well as technical and scientific devices. Automotive, aerospace, power generation (both by conventional and renewable energies), industrial equipment and rotating machinery, materials and chemical processing, and many other industries are requiring heat and mass transfer processes. Since the early studies in the seventeenth and eighteenth centuries, there has been tremendous technical progress and scientific advances in the knowledge of heat and mass transfer, where modeling and simulation developments are increasingly contributing to the current state of the art. Heat and Mass Transfer - Advances in Science and Technology Applications aims at providing researchers and practitioners with a valuable compendium of significant advances in the field.
Aerospace Transmission Systems
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Author :
language : en
Publisher:
Release Date : 1998
Aerospace Transmission Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Aerospace engineering categories.