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Author : Dina Fastovsky
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (87 download)
Download or read book Experimental Study of Vortex Breakdown and Its Control in Swirling Flow written by Dina Fastovsky and published by . This book was released on 2007 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : José L. Stevens
Publisher :
ISBN 13 :
Total Pages : 142 pages
Book Rating : 4.F/5 ( download)
Download or read book Experimental Study of Vortex Breakdown in a Cylindrical, Swirling Flow written by José L. Stevens and published by . This book was released on 1996 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781723049668
Total Pages : 146 pages
Book Rating : 4.0/5 (496 download)
Download or read book Experimental Study of Vortex Breakdown in a Cylindrical, Swirling Flow written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: The stability of a steady, vortical flow in a cylindrical container with one rotating endwall has been experimentally examined to gain insight into the process of vortex breakdowwn. The dynamics of the flow are governed by the Reynolds number (Re) and the aspect ratio of the cylinder. Re is given by Omega R(sup 2)/nu, where Omega is the speed of rotation of the endwall, R is the cylinder radius, and nu is the kinematic viscosity of the fluid filling the cylinder. The aspect ratio is H/R, where H is the height of the cylinder. Numerical simulation studies disagree whether or not the steady breakdown is stable beyond a critical Reynolds number, Re(sub c). Previous experimental researches have considered the steady and unsteady flows near Re(sub c), but have not explored the stability of the steady breakdown structures beyond this value. In this investigation, laser induced fluorescence was utilized to observe both steady and unsteady vortex breakdown at a fixed H/R of 2.5 with Re varying around Re(sub c). When the Re of a steady flow was slowly increased beyond Re(sub c), the breakdown structure remained steady even though unsteadiness was possible. In addition, a number of hysteresis events involving the oscillation periods of the unsteady flow were noted. The results show that both steady and unsteady vortex breakdown occur for a limited range of Re above Re(sub c). Also, with increasing Re, complex flow transformations take place that alter the period at which the unsteady flow oscillates. Stevens, J. L. and Celik, Z. Z. and Cantwell, B. J. and Lopez, J. M. Ames Research Center VORTEX BREAKDOWN; SWIRLING; FLOW STABILITY; STEADY FLOW; INTERNAL FLOW; REYNOLDS NUMBER; CYLINDRICAL BODIES; ASPECT RATIO; AXISYMMETRIC FLOW; FLOW VISUALIZATION; OSCILLATIONS; PERTURBATION; BUBBLES; UNSTEADY FLOW; VISCOSITY; LASER INDUCED FLUORESCENCE...
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)
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...
Author : Turgut Sarpkaya
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (227 download)
Download or read book An Experimental Investigation of the Vortex-breakdown Phenomenon written by Turgut Sarpkaya and published by . This book was released on 1970 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of an experimental investigation of the characteristics of stationary and travelling vortex breakdowns in swirling flow in a diverging cylindrical tube are presented and discussed. Basically, three types of vortex breakdown were observed, viz., double helix, spiral, and axisymmetric breakdown. The type and location of the stationary breakdowns were found to be dependent upon the Reynolds and circulation numbers of the flow. The breakdown bubble responded to gradual and abrupt changes in the upstream and downstream flow conditions in a manner analogous to the hydraulic jump in open-channel flow. The observations reported and the evidence presented revealed unmistakably that the vortex breakdown is a finite transition from a uniform state of swirling flow (supercritical) to one (subcritical) featuring a large standing wave, followed by standing wavelets, of finite amplitude. (Author).
Author :
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (317 download)
Download or read book Vortex Breakdown and Control Experiments in the Ames-Dryden Water Tunnel written by and published by . This book was released on 1986 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow-field measurements have been made to determine the effects of core blowing on vortex breakdown and control. The results of these proof-of-concept experiments clearly demonstrate the usefulness of water tunnels as test platforms for advanced flow-field simulation and measurement.
Author : Amrish Kumar Garg
Publisher :
ISBN 13 :
Total Pages : 550 pages
Book Rating : 4.E/5 ( download)
Download or read book Oscillatory Behavior in Vortex Breakdown Flows written by Amrish Kumar Garg and published by . This book was released on 1977 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. E. Spall
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (317 download)
Download or read book On a Criterion for Vortex Breakdown written by R. E. Spall and published by . This book was released on 1987 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Francis G. Novak
Publisher :
ISBN 13 : 9781423557371
Total Pages : 336 pages
Book Rating : 4.5/5 (573 download)
Download or read book An Experimental Investigation of Vortex Breakdown in Tubes at High Reynolds Numbers written by Francis G. Novak and published by . This book was released on 1998-09-01 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis deals with non-cavitating swirling flows with vortex breakdown in various tubes. Phenomenological and quantitative investigations were carried out at Reynolds numbers as high as 300,000. It was shown that a high Re(D) vortex transitions to its new state (breaks down) via a rapidly spinning spiral form, as demonstrated with 4,000 frame per second video, short exposure time (6 ns) imaging, and Digital Particle Image Velocimetry. Of the known types, the spiral emerges as the fundamental breakdown form and the axisymmetric bubble may now be regarded as a relatively low Re(D) occurrence that is bypassed at sufficiently high Re(D). Some new phenomena were observed at high Re(D): Extremely rapid spiral rotation (over 1,000 revolutions per second), core bifurcation, and changes in the sense of the spiral windings. Familiar features of breakdowns, such as the transition from a jet-like to wake-like axial velocity profile and the rapidly expanding vortex core, were observed in extensive time averaged velocity and turbulence results ascertained with Laser Doppler Velocimetry. However, a mean stagnation point and recirculation were absent in the highest Re(D) flow. The core meandering and stagnation point darting in the turbulent flow field were quantified and discussed in detail.
Author : Bach Thien Vu
Publisher :
ISBN 13 :
Total Pages : 464 pages
Book Rating : 4.E/5 ( download)
Download or read book Experimental Study of Turbulent Swirling Flows written by Bach Thien Vu and published by . This book was released on 1983 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ken Chi Kien Cheung
Publisher :
ISBN 13 :
Total Pages : 164 pages
Book Rating : 4.:/5 (282 download)
Download or read book A Theoretical and Experimental Study of Vortex Breakdown written by Ken Chi Kien Cheung and published by . This book was released on 1993 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James Henry Faler
Publisher :
ISBN 13 :
Total Pages : 496 pages
Book Rating : 4.E/5 ( download)
Download or read book Some Experiments in Swirling Flows written by James Henry Faler and published by . This book was released on 1976 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dario Amirante
Publisher :
ISBN 13 :
Total Pages : 186 pages
Book Rating : 4.:/5 (111 download)
Download or read book A Numerical Study of Instability and Vortex Breakdown of Swirling Flow written by Dario Amirante and published by . This book was released on 2007 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sammy Khalil
Publisher :
ISBN 13 :
Total Pages : 598 pages
Book Rating : 4.:/5 (271 download)
Download or read book An Experimental Investigation Into Vortex Breakdown and Vortex Breakdown Control written by Sammy Khalil and published by . This book was released on 2006 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jon Ronald Fantin
Publisher :
ISBN 13 :
Total Pages : 47 pages
Book Rating : 4.:/5 (227 download)
Download or read book An Investigation of the Characteristics of Swirling Flow in a Diverging Tube written by Jon Ronald Fantin and published by . This book was released on 1968 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of an imposed pressure gradient on the core of a vortex is examined both theoretically and experimentally. The test apparatus consisted of a vortex chamber and a diverging tube. The swirling flow was generated by means of adjustable vanes at the periphery of the vortex chamber and by introducing varying amounts of air. Pressure distributions were obtained along the wall of the tube for various flows and vane settings. In addition, the core of the vortex was photographed by introducing smoke at the axis of the vortex chamber. The theoretical and experimental results show the existence of standing waves arising from the vortex breakdown and the existence of critical conditions, depending on the ratio of the rotational and longitudinal velocity components, beyond which drastic changes of flow structure must occur. The theoretical results were found to be closely related to the observed phenomena. (Author).
Author : David Roy Fitzjarrald
Publisher :
ISBN 13 :
Total Pages : 138 pages
Book Rating : 4.:/5 (319 download)
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:
Author : Gustavo Cesar Rachid Bodstein
Publisher :
ISBN 13 :
Total Pages : 370 pages
Book Rating : 4.E/5 ( download)
Download or read book A Theoretical and Experimental Study of the Interaction of a Streamwise Vortex with a Surface written by Gustavo Cesar Rachid Bodstein and published by . This book was released on 1993 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
