Scientific and Technical Aerospace Reports PDF Download
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 704
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 704
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Author:
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ISBN:
Category : Federal aid to research
Languages : en
Pages : 510
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Author: United States. National Aeronautics and Space Administration. Office of University Affairs
Publisher:
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Category :
Languages : en
Pages : 396
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ISBN:
Category : Government publications
Languages : en
Pages : 1592
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ISBN:
Category : Government publications
Languages : en
Pages : 1400
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages :
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 576
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 712
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Book Description
A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA)
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722220938
Category :
Languages : en
Pages : 42
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An experimental project was undertaken to investigate the character of vortex breakdown with particular regard to the waveguide theories of vortex breakdown. A rectangular wing based on the NACA 0012 airfoil was used to produce a trailing vortex which convected downstream without undergoing breakdown. Dye marked the vortex location. A disturbance was then introduced onto the vortex using a small moving wire to 'cut' the vortex. The development of upstream and downstream propagating disturbance waves was observed and the propagation velocities measured. The downstream traveling wave produced a structure similar in appearance to a vortex breakdown. The upstream wave produced a moving, swirling, turbulent region that was not a vortex breakdown. The waves moving in either direction have the same swirl velocity profiles but quite different axial velocity profiles. The upstream disturbance (turbulence) moved into a flow with an axial velocity profile that had a wake-like defect in the core region. The downstream moving vortex breakdown moved into a flow with a jet-like overshoot in the core region. The fact that no breakdown was observed for the wake-like defect and breakdown was observed for the jet-like overshoot is not consistent with computational fluid dynamics (CFD) calculations. Although there are not a lot of examples, CFD results show breakdown for both types of profiles. The longitudinal and swirl velocity profiles were documented by Laser Doppler Velocimeter (LDV) measurement. Wave velocities, swirl angles, and swirl parameters are reported. Panton, Ronald L. and Stifle, Kirk E. Unspecified Center NAG2-389...
Author: Agnes Maurel
Publisher: Springer
ISBN: 3540445358
Category : Science
Languages : en
Pages : 330
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Book Description
The object of this book is to present the state of the art and to summarize the most recent advances in the structure and dynamics of vortices. This subject has indeed recently made some remarkable progress, particularly thanks to stu- dies of turbulence, where coherent structures have been shown to play an important role. The book presents four ge- neral reviews on the experimental, numerical, theoretical, and 2D-vortex aspects. In addition to these reviews, a se- ries of articles describe a cross-section of recent work. Some of these studies are concerned with related fields, such as turbulence, aerodynamics, wakes, geophysics, mixing, and particle dynamics.
