The Plane Mixing Layer Flow Visualization Results And Three Dimensional Effects
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The Plane Mixing Layer Flow Visualization Results And Three Dimensional Effects
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Author : A. Roshko
language : en
Publisher:
Release Date : 1980
The Plane Mixing Layer Flow Visualization Results And Three Dimensional Effects written by A. Roshko and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
The turbulent mixing layer between two streams of different velocities continues to play a central role in research aimed at improved understanding of turbulent shear flows in general. At present, not all researchers are in agreement as to what various experiments imply about the structure of mixing layers at high Reynolds number. The views which are held differ on the question as to how and to what extent three dimensionality develops in these flows and whether the characteristic spanwise organized large vortex structures (rollers) continue to be a dominant feature. The traditional view, as extended to the contemporary scene, is that ultimately (i.e., sufficiently far downstream or at sufficiently high Reynolds number) the flow will be completely disorganized. The view put forward by 'eddy chasers' is that such vortex structures are primary elements, characteristic of the underlying mean vorticity field, which is particularly simple for the mixing layer, and that, as long as the velocity difference is maintained, there is a mechanism to regenerate these primary structures by what, for convenience, may be called a Kelvin-Helmholtz instability. The heart of the controversy then is whether, or to what extent, secondary and higher instabilities will ultimately break down, completely disorganize or prevent formation of organized primary structures. In a plane mixing layer, the primary structures would, ideally, be two dimensional, containing the basic single component of vorticity while secondary and higher modes of instability would introduce three dimensionality and the other two components of vorticity into the flow. (Author).
On The Origin And Evolution Of Three Dimensional Effects In The Mixing Layer
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Author :
language : en
Publisher:
Release Date : 1979
On The Origin And Evolution Of Three Dimensional Effects In The Mixing Layer written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
There seems to be at least two different phenomena connected with the three-dimensional breakdown of the plane mixing layer. First, at least in some cases, there is a macroscopic instability of the large structure which produces a spanwise system of longitudinal jets whose amplitude builds up very quickly and then remains approximately constant while their separation adjust itself to a value that is somewhat higher that the vorticity thickness of the layer. This phenomenon may be due to a collective instability of the vortex cores of the same type as the one found in vortex rings. The second phenomenon is the development of a 3-D inertial subrange in the spectrum of the small scales of the velocity fluctuations. In the only case in which we have documented both phenomena the second one does not develop fully until the macroscopic instability has not been growing for some time and has actually arrived to what seems to be its final configuration. Moreover there is some indication that there are two qualitatively different ways for the establishment of the 3-D inertial ranges, exemplified here by the water and air experiments. In the first one the transition is abrupt and there is an initial part in which the inertial range has a slope characteristic of the 2-D entrophy cascade. In the second one the transition is more gradual and there is no evidence of a 2-D regime. It is not clear at present which is the condition responsible for the differences between the two cases. The work presented in this report should be seen as a preliminary exploration of the effects connected with the 3-D transition. Much more research is needed in all cases.
An Experimental Study Of Plane Mixing Layer Development
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Author :
language : en
Publisher:
Release Date : 1985
An Experimental Study Of Plane Mixing Layer Development written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Unsteady Combustor Physics
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Author : Tim C. Lieuwen
language : en
Publisher: Cambridge University Press
Release Date : 2021-10-21
Unsteady Combustor Physics written by Tim C. Lieuwen and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-10-21 with Science categories.
Explore a unified treatment of the dynamics of combustor systems, including acoustics, fluid mechanics, and combustion in a single rigorous text. This updated new edition features an expansion of data and experimental material, updates the coverage of flow stability, and enhanced treatment of flame dynamics. Addresses system dynamics of clean energy and propulsion systems used in low emissions systems. Synthesizing the fields of fluid mechanics and combustion into a coherent understanding of the intrinsically unsteady processes in combustors. This is a perfect reference for engineers and researchers in fluid mechanics, combustion, and clean energy.
The Global Geometry Of Turbulence
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Author : Javier Jiménez
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
The Global Geometry Of Turbulence written by Javier Jiménez and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
The aim of this Advanced Research Workshop was to bring together Physicists, Applied Mathematicians and Fluid Dynamicists, including very specially experimentalists, to review the available knowledge on the global structural aspects of turbulent flows, with an especial emphasis on open systems, and to try to reach a consensus on their possible relationship to recent advances in the understanding of the behaviour of low dimensional dynamical systems and amplitude equations. A lot has been learned during recent years on the non-equilibrium behaviour of low dimen sional dynamical systems, including some fluid flows (Rayleigh-Benard, Taylor-Couette, etc. ). These are mostly closed flows and many of the global structural features of the low dimensional systems have been observed in them, including chaotic behaviour, period doubling, intermit tency, etc. . It has also been shown that some of these flows are intrinsically low dimensional, which accounts for much of the observed similarities. Open flows seem to be different, and experimental observations point to an intrinsic high dimensionality. However, some of the tran sitional features of the low dimensional systems have been observed in them, specially in the intermittent behaviour of subcritical flows (pipes, channels, boundary layers with suction, etc. ), and in the large scale geometry of coherent structures of free shear flows (mixing layers, jets and wakes).
Flow Visualization
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Author : Alexander J. Smits
language : en
Publisher: World Scientific
Release Date : 2012
Flow Visualization written by Alexander J. Smits and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Technology & Engineering categories.
This is the 2nd edition of the book, Flow Visualization: Techniques and Examples, which was published by Imperial College Press in 2000. Many of the chapters have been revised and updated to take into consideration recent changes in a number of flow visualization and measurement techniques, including an updated high quality flow gallery. Unique among similar publications, this book focuses on the practical rather than theoretical aspects. Obtaining high quality flow visualization results is, in many ways, more of an art than a science, and experience plays a key deciding role. The depth and breadth of the material will make this book invaluable to readers of all levels of experience in the field.
Technical Abstract Bulletin
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Author :
language : en
Publisher:
Release Date : 1980
Technical Abstract Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Science categories.
Perspectives In Turbulence Studies
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Author : Hans U. Meier
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Perspectives In Turbulence Studies written by Hans U. Meier and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
The present volume entitled "Perspectives in Turbulence Stud ies" is dedicated to Dr. Ing. E. h. Julius C. Rotta in honour of his 75th birthday. J. C. Rotta, born on January 1, 1912, started his outstanding career in an unusual way, namely in a drawing office (1928 - 1931). At the same time he - as a purely self taught perso- took a correspondence course in airplane construction. From 1934 to 1945 he worked in the aircraft industry on different subjects in the fields of flight mechanics, structures, air craft design, and aerodynamics. In 1945 he moved to Gottingen and worked from that time at the Aerodynamische Versuchsanstalt (AVA, now DFVLR) and the Max-Planck-Institut fur Stromungsforschung (1947-1958), interrupted only by a stay in the U. S. at the Glenn L. Martin Company (1954 - 1955) and a visiting professorship at the Laval University in Quebec, Canada (1956). Already during his activities in industry, Dr. Rotta discovered his special liking for aerodynamics. In Gottingen, he was attracted by Ludwig Prandtl's discussions about problems associated with turbulence and in particular his new contribution to fully developed turbulence, published in 1945. At that time, W. Heisenberg and C. F. v. Weizacker pub lished their results on the energy spectra of isotropic turbu lence at large wave numbers. Since that time his main research interest in reasearch has been in turbulence problems.
Handbook Of Flow Visualization
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Author : Wen Jei Yang
language : en
Publisher: Routledge
Release Date : 2018-12-19
Handbook Of Flow Visualization written by Wen Jei Yang and has been published by Routledge this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-12-19 with Technology & Engineering categories.
With contributions from some of the world's leading experts, the second edition of this classic reference compiles all major techniques of flow visualization and demonstrates their applications in all fields of science and technology. A new chapter has been added that covers flow visualization applications in large wide tunnels for airplane and automobile testing. Several important examples of applications are included. A second new chapter details the use of infrared (IR) cameras for detecting and observing the boundary layer transition in industrial wind tunnels and flight testing of commercial transport airplanes. A final new chapter has been added on multiphase flow and pulsed-light velocimetry.
