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Experimental Study Of A Vortex Subjected To Imposed Strain
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722220938 Total Pages :42 pages Book Rating :4.2/5 (29 download)
Book Synopsis Experimental Study of a Vortex Subjected to Imposed Strain by : National Aeronautics and Space Administration (NASA)
Download or read book Experimental Study of a Vortex Subjected to Imposed Strain written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-05 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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...
Book Synopsis Electron Vortices Subject to Imposed Strain Flows by : Noah Hurst
Download or read book Electron Vortices Subject to Imposed Strain Flows written by Noah Hurst and published by . This book was released on 2018 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: The stability and dynamics of two-dimensional (2D) ideal fluid vortices are studied under the influence of externally imposed irrotational strain flows. Laboratory experiments are conducted using pure electron plasmas. This is made possible by the isomorphism between the Drift-Poisson equations describing the dynamics of a single-component plasma perpendicular to the magnetic field and the 2D Euler equations describing inviscid, incompressible (ideal) fluids. Here, electron density is the analog of vorticity in a neutral fluid. The experimental apparatus used in this work was designed specifically to study vortex dynamics under the influence of external flows. It features a long, cylindrical electrode spanning the length of the plasma which is divided into eight azimuthal segments that can be electrically biased. Advantages of using electron plasmas to study 2D ideal fluid dynamics are that the system is dissipationless over many vortex rotation periods, the vorticity can be diagnosed directly, and the initial vorticity profile and boundary conditions can be precisely controlled. Quasi-flat, axisymmetric vorticity profiles are prepared and subjected to external strain. The results are in quantitative agreement with a dynamical theory assuming the vorticity is piecewise-constant inside an elliptical boundary. Dynamical oscillations of the ellipses are observed, as well as stationary modes, and stretching modes that lead to vortex destruction. When non-flat (e.g., Gaussian) radial vorticity profiles are used, the vortices suffer loss of outer circulation, the stability threshold for vortex destruction is lowered, and the dynamical orbits undergo inviscid damping, thus driving the system toward a stationary elliptical state. Preliminary experiments are also described in which the strength of the strain flow was varied in time. The relationship of these results to other theoretical, experimental, and numerical work is discussed, as are prospects for future research studying the dynamics of electron vortices in strain and shear flows.
Book Synopsis The Dynamics of a Columnar Vortex in an Imposed Strain by : Mathematical Sciences Research Institute (Berkeley, Calif.).
Download or read book The Dynamics of a Columnar Vortex in an Imposed Strain written by Mathematical Sciences Research Institute (Berkeley, Calif.). and published by . This book was released on 1983 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Study of a Single Confined Vortex Flow by : Takashi Nakamura
Download or read book Experimental Study of a Single Confined Vortex Flow written by Takashi Nakamura and published by . This book was released on 1966 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Vortex Flow by : Allen Scott Neuls
Download or read book An Experimental Study of Vortex Flow written by Allen Scott Neuls and published by . This book was released on 1971 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Three-dimensional Mean Flow Experimental Study of Vortex Unwinding by : Catherine Bridget McGinley
Download or read book Three-dimensional Mean Flow Experimental Study of Vortex Unwinding written by Catherine Bridget McGinley and published by . This book was released on 1988 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Vortex Breakdown by : David Roy Fitzjarrald
Download or read book An Experimental Study of Vortex Breakdown written by David Roy Fitzjarrald and published by . This book was released on 1974 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Study of a Compressible Viscous Vortex by : James M. Kendall
Download or read book Experimental Study of a Compressible Viscous Vortex written by James M. Kendall and published by . This book was released on 1962 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Study of Two-dimensional Vortex Patterns for Impulsively Started Bodies in Comparison with Other Configurations by : Fathi Finaish
Download or read book Experimental Study of Two-dimensional Vortex Patterns for Impulsively Started Bodies in Comparison with Other Configurations written by Fathi Finaish and published by . This book was released on 1987 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Study of Wave/vortex Interactions by : Ana María de León Meléndez
Download or read book Experimental Study of Wave/vortex Interactions written by Ana María de León Meléndez and published by . This book was released on 2004 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Vortex Flow by : George D. Moore (CAPT, USAF.)
Download or read book An Experimental Study of Vortex Flow written by George D. Moore (CAPT, USAF.) and published by . This book was released on 1959 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Mixing and Chemical Reaction in a Vortex by : Nazri Bin Mohamad
Download or read book An Experimental Study of Mixing and Chemical Reaction in a Vortex written by Nazri Bin Mohamad and published by . This book was released on 1991 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of a Confined Vortex Flow by : Tadeusz Jozef Kotas
Download or read book An Experimental Study of a Confined Vortex Flow written by Tadeusz Jozef Kotas and published by . This book was released on 1975 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ASME 69-WA/APM-3 written by G. J. Farris and published by . This book was released on 1969 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Study on Feedback Control of Vortex Shedding from a Cylinder at Low Reynolds Numbers by : Jin Sheng Tao
Download or read book Experimental Study on Feedback Control of Vortex Shedding from a Cylinder at Low Reynolds Numbers written by Jin Sheng Tao and published by . This book was released on 1997 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Vortex Flow and Turbulence in Concentric and Eccentric Annuli by : J. H. Vohr
Download or read book An Experimental Study of Vortex Flow and Turbulence in Concentric and Eccentric Annuli written by J. H. Vohr and published by . This book was released on 1964 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are presented for an experimental study of Taylor vortices and turbulence in the flow between a rotating inner cylinder and both concentric and eccentric stationary outer cylinders. The results include: 1). measurement of the critical speed for onset of Taylor vortices as function of the eccentricity of the cylinders, 2). visual study of the flow up to a Reynolds number of 40,000, 3). measurement of the friction factor for the flow up to a Reynolds number of number of 40,000, 4). study of the effect of axial flow on the critical speed for onset of Taylor vortices. 5). preparation of design charts for calculating friction loss in concentric and eccentric journal bearings, operating in super-laminar flow regime.--Author.
Book Synopsis Experimental Study of Vortex Flow in a Cylinder by : Edward Joseph Palanek (CAPT, USAF.)
Download or read book Experimental Study of Vortex Flow in a Cylinder written by Edward Joseph Palanek (CAPT, USAF.) and published by . This book was released on 1966 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
