Instability and Control of Massively Separated Flows: Proceedings of the International Conference on Instability and Control of Massively Separated Flows, held in Prato, Italy, from 4-6 September 2013

281 Pages·2015·16.44 MB·English

by  Vassilis Theofilis, Julio Soria (eds.)

Fluid Mechanics and Its Applications
Vassilis Theofilis
Julio Soria Editors
Instability and
Control of Massively
Separated Flows
Proceedings of the International
Conference on Instability and Control
of Massively Separated Flows, held in
Prato, Italy, from 4–6 September 2013
Fluid Mechanics and Its Applications
Volume 107
Series editor
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Saint Martin d’Hères Cedex, France
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Vassilis Theofilis Julio Soria
•
Editors
Instability and Control
of Massively Separated
Flows
Proceedings of the International Conference
on Instability and Control of Massively
Separated Flows, held in Prato, Italy,
from 4–6 September 2013
123
Editors
VassilisTheofilis Julio Soria
School ofAerospace Engineering Department of Mechanical
Technical University ofMadrid andAerospace Engineering
Madrid Monash University
Spain Melbourne,VIC
Australia
and
Department of Aeronautical Engineering
KingAbdulaziz University
Jeddah
UnitedKingdom ofSaudi Arabia
ISSN 0926-5112 ISSN 2215-0056 (electronic)
ISBN 978-3-319-06259-4 ISBN 978-3-319-06260-0 (eBook)
DOI 10.1007/978-3-319-06260-0
Springer ChamHeidelberg New YorkDordrecht London
LibraryofCongressControlNumber:2014946397
(cid:2)SpringerInternationalPublishingSwitzerland2015
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Preface
v
vi Preface
In 1954 I started my research on separation
bubbles.
A sharp nosed aerofoil has a steep adverse
pressure gradient aft of the nose that causes the
boundary layer to separate. At high Reynolds
numbers the separated shear layer will become
turbulent and reattach forming a short bubble .
At lower Reynolds numbers the flow may fail to
reattach, or it may form a long bubble .
This so-called bursting of the bubble causes a
drastic loss of lift and is called a leading edge
stall.
-Cp
Inviscid flow
Preface vii
High Reynolds number
Low Reynolds number
viii Preface
I was asked to find the cause of this devastating
form of stall on swept wings. I considered the
problem of zero sweep.
The next slide shows contours of the velocities
measured with a hot-wire anemometer through a
short bubble. The hot-wire signals clearly
indicated roughly periodic oscillations in the
shear layer. These oscillations increased in
amplitude as the wire was moved downstream
and eventually the signals became chaotic in the
turbulent zone near reattachment.
Was the growth of perturbations the key to the
problem?
Preface ix
Velocity contours through the bubble
Velocity profiles