Explanation of Vortex Breakdown with the Help of Stability Theory of Spiralling Flows PDF Download
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Author: Hubert Ludwieg
Publisher:
ISBN:
Category : Vortex-motion
Languages : en
Pages : 40
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Book Description
Author: Hubert Ludwieg
Publisher:
ISBN:
Category : Vortex-motion
Languages : en
Pages : 40
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Book Description
Author: R. E. Spall
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Author: S. Leibovich
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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Book Description
Theoretical and experimental results, some quite recent, on the instability and breakdown of concentrated vortices at high Reynolds numbers are reviewed. Wave related theories of the vortex breakdown phenomena are treated in some detail; these appear to provide a qualitative description of the response of vortex breakdown to variations in swirl or flow rate, and Benjamin's criticality classification, a wave-based concept, is consistent with experimental data. Known general criteria for the stability of instability of inviscid columnar vortices are reviewed, together with numerical studies of an inviscid vortex model that provides an excellent analytical fit to measured velocity profiles in vortices that experience breakdown. A new analysis of experimental data on vortex breakdown flows sheds light on the interplay between criticality and instability. The flows sufficiently far upstream of breakdowns to be unaffected by them are supercritical and stable, but they are generally closer to marginal instability than they are to criticality. The wakes are both subcritical and unstable. A conceptual framework for vortex breakdown, incorporating nonlinear wave theory and instability to three-dimensional disturbances, is suggested based on information derived from the experimental studies. (Author).
Author: Amrish Kumar Garg
Publisher:
ISBN:
Category : Eddies
Languages : en
Pages : 550
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Book Description
Author: Thinh Tien Nguyen
Publisher:
ISBN:
Category : Hydrodynamics
Languages : en
Pages : 296
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Book Description
Author: Sheldon Green
Publisher: Springer Science & Business Media
ISBN: 940110249X
Category : Technology & Engineering
Languages : en
Pages : 905
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Book Description
Fluid Vortices is a comprehensive, up-to-date, research-level overview covering all salient flows in which fluid vortices play a significant role. The various chapters have been written by specialists from North America, Europe and Asia, making for unsurpassed depth and breadth of coverage. Topics addressed include fundamental vortex flows (mixing layer vortices, vortex rings, wake vortices, vortex stability, etc.), industrial and environmental vortex flows (aero-propulsion system vortices, vortex-structure interaction, atmospheric vortices, computational methods with vortices, etc.), and multiphase vortex flows (free-surface effects, vortex cavitation, and bubble and particle interactions with vortices). The book can also be recommended as an advanced graduate-level supplementary textbook. The first nine chapters of the book are suitable for a one-term course; chapters 10--19 form the basis for a second one-term course.
Author: Nessan Mac Giolla Mhuiris
Publisher:
ISBN:
Category :
Languages : en
Pages : 44
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Book Description
Author: Nessan Mac Giolla Mhuiris
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 324
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 46
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Book Description
Author: S. N. Singh
Publisher:
ISBN:
Category : Axial flow
Languages : en
Pages : 72
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Book Description
A literature survey on the vortex breakdown phenomenon is presented. Several theoretical and numerical models which have been proposed and applied to explain the experimental observations concerning vortex bursting are reviewed. Required parameters to perform the related stability analysis have been identified. Appropriate criteria where possible are cited to assist engineers in estimating occurrence of vortext bursting. A numerical scheme to compute and verify some of the results for incompressible inviscid unstable modes is programmed on the computer at WPAFB. It is suggested that the influence of adverse pressure gradient on the vortex breakdown be investigated in detail and results thus obtained be compared with experiments under appropriate conditions.
