Oil Droplet Impact Dynamics in Aero-Engine Bearing Chambers-Correlations derived from Direct Numerical Simulations

Oil Droplet Impact Dynamics in Aero-Engine Bearing Chambers-Correlations derived from Direct Numerical Simulations
Author :
Publisher : Logos Verlag Berlin GmbH
Total Pages : 206
Release :
ISBN-10 : 9783832540012
ISBN-13 : 3832540016
Rating : 4/5 (016 Downloads)

Book Synopsis Oil Droplet Impact Dynamics in Aero-Engine Bearing Chambers-Correlations derived from Direct Numerical Simulations by : Davide Peduto

Download or read book Oil Droplet Impact Dynamics in Aero-Engine Bearing Chambers-Correlations derived from Direct Numerical Simulations written by Davide Peduto and published by Logos Verlag Berlin GmbH. This book was released on 2015-06-30 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 Droplet Impact Dynamics in Aero-Engine Bearing Chambers-Correlations derived from Direct Numerical Simulations Related Books

Oil Droplet Impact Dynamics in Aero-Engine Bearing Chambers-Correlations derived from Direct Numerical Simulations
Language: en
Pages: 206
Authors: Davide Peduto
Categories: Science
Type: BOOK - Published: 2015-06-30 - Publisher: Logos Verlag Berlin GmbH

DOWNLOAD EBOOK

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 o
Bulletin of the Atomic Scientists
Language: en
Pages: 104
Authors:
Categories:
Type: BOOK - Published: 1970-12 - Publisher:

DOWNLOAD EBOOK

The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhat
Bulletin of the Atomic Scientists
Language: en
Pages: 64
Authors:
Categories:
Type: BOOK - Published: 1972-10 - Publisher:

DOWNLOAD EBOOK

The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhat
Technical Literature Abstracts
Language: en
Pages: 520
Authors: Society of Automotive Engineers
Categories: Technical literature
Type: BOOK - Published: 1995 - Publisher:

DOWNLOAD EBOOK

Cumulative Index [of The] SAE Papers
Language: en
Pages: 1646
Authors: Society of Automotive Engineers
Categories: Engineering
Type: BOOK - Published: 1965 - Publisher:

DOWNLOAD EBOOK