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The Origin And Structure Of Trailing Vortices In Aerodynamics
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Book Synopsis The Origin and Structure of Trailing Vortices in Aerodynamics by :
Download or read book The Origin and Structure of Trailing Vortices in Aerodynamics written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The helicopter rotor wake is among the most complex flow-fields in aerodynamics. Despite the fact that a large amount of computational and experimental work on the rotor wake has been published, little of a quantitative nature is known about the origin of the main component of the rotor wake, the tip-vortex, as a function of the rotor speed, rotor blade geometry, and angle of attack. The primary objective of this work is to predict the formation of the rotor tip vortex as a function of physical parameters such as angle of attack, rotor speed, and blade aspect ratio. While the rotor-blade tip-vortex is of primary interest, the techniques developed are applicable to fixed wings as well.
Book Synopsis The Structure of Trailing Vortices Generated by Model Rotor Blades by :
Download or read book The Structure of Trailing Vortices Generated by Model Rotor Blades written by and published by . This book was released on 1981 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluid Vortices written by Sheldon Green and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 905 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Trailing Vortex Structure with Longitudinal Core Flow by : Amir Allaf Akbari
Download or read book Trailing Vortex Structure with Longitudinal Core Flow written by Amir Allaf Akbari and published by . This book was released on 2015 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In this study, Particle Image Velocimetry(PIV) measurements were performed on a vortex have two levels of circulation corresponding to a wing angle of incidence, ... and two Reynolds number based on wing chord, ... Measurements were made at different locations along the wind tunnel in longitudinal planes, ... and cross-sectional planes, ... The effect of longitudinal core flow was evaluated using four levels of jet velocity, ..., added to the vortex core. Results for the instantaneous, mean and variance of the vorticity field are presented. The mean and variance of velocity on longitudinal plane show the vortex core flow. Vortex wandering is measured and used to correct the mean and variance of the vorticity field. The instantaneous vorticity fields were found to be complex and with elements of co-rotating vortices around the primary vortex and strong circumferential components of vorticity on the core. The vortex radius was smaller for the higher level of circulation cases and tangential velocity was increased by increasing the level of circulation. The jet velocity was observed to have a weak effect on the vortex structure. The variance of longitudinal vorticity was found to be occurred in a ring shape around the vortex core in the cross-sectional plane. The vorticity variance decayed with downstream distance and it was found that the variance of longitudinal vorticity scaled with mean circulation."--Page ii.
Book Synopsis Elements of Vorticity Aerodynamics by : James C. Wu
Download or read book Elements of Vorticity Aerodynamics written by James C. Wu and published by Springer. This book was released on 2017-12-27 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book opens with a discussion of the vorticity-dynamic formulation of the low Mach number viscous flow problem. It examines the physical aspects of the velocity and the vorticity fields, their instantaneous relationship, and the transport of vorticity in viscous fluids for steady and unsteady flows. Subsequently, using classical analyses it explores the mathematical aspects of vorticity dynamics and issues of initial and boundary conditions for the viscous flow problem. It also includes the evolution of the vorticity field which surrounds and trails behind airfoils and wings, generalizations of Helmholtz’ vortex theorems and the Biot-Savart Law. The book introduces a theorem that relates the aerodynamic force to the vorticity moment and reviews the applications of the theorem. Further, it presents interpretations of the Kutta-Joukowski theorem and Prandtl’s lifting line theory for vorticity dynamics and discusses wake integral methods. The virtual-mass effect is shown to be the seminal event in unsteady aerodynamics and a simple approach for evaluating virtual-mass forces on the basis of vorticity dynamics is presented. The book presents a modern viewpoint on vorticity dynamics as the framework for understanding and establishing the fundamental principles of viscous and unsteady aerodynamics. It is intended for graduate-level students of classical aerodynamics and researchers exploring the frontiers of fully unsteady and non-streamlined aerodynamics.
Book Synopsis Prediction of Turbulent Core Structure in a Trailing Vortex by : John A. Rule
Download or read book Prediction of Turbulent Core Structure in a Trailing Vortex written by John A. Rule and published by . This book was released on 1994 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720518587 Total Pages :64 pages Book Rating :4.5/5 (185 download)
Book Synopsis Experimental Study of the Structure of a Wingtip Vortex by : National Aeronautics and Space Administration (NASA)
Download or read book Experimental Study of the Structure of a Wingtip Vortex written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-31 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete look at the near-field development and subsequent role-up of a wingtip vortex from a NACA 0015 wing section is investigated. Two separate but equally important surveys of the vortex structure in the region adjacent to the wingtip and approximately one chord length downstream of the trailing edge are performed. The two surveys provide qualitative flow-visualization an quantitative velocity measurement data. The near-field development and subsequent role-up of the vortex structures is strongly influenced by the angle-of-attack and the end-cap treatment of the wing section. The velocity field near the wingtip of the NACA 0015 wing section was measured with a triple-sensor hot wire probe and compared to flow visualization images produced with titanium tetrachloride smoke injection and laser illumination. The flat end-cap results indicate the formation of multiple, relatively strong vortex structures as opposed to the formation of a single vortex produced with the round end-cap. The multiple vortices generated by the flat end-cap are seen to rotate around a common ce te in a helical pattern until they eventually merge into a single vortex. Compared to a non-dimensional loading parameter, the results of the velocity and flow visualization data shows a "jetlike" axial velocity profile for loading parameter values on the order of 0.1 and a "wakelike" profile for much lower loading parameter values.Anderson, Elgin A. and Wright, Christopher T.Langley Research CenterWING TIPS; VORTICES; SUBSONIC WIND TUNNELS; AERODYNAMIC CONFIGURATIONS; AERODYNAMIC CHARACTERISTICS; FLOW VISUALIZATION; ANGLE OF ATTACK; TRAILING EDGES; VELOCITY DISTRIBUTION
Book Synopsis Air Force Research Review by : United States. Air Force. Systems Command
Download or read book Air Force Research Review written by United States. Air Force. Systems Command and published by . This book was released on 1970 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Structure of Turbulent Line Vortices by :
Download or read book The Structure of Turbulent Line Vortices written by and published by . This book was released on 1972 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theory is given to explain the observed dependence on Reynolds number of the decay of turbulent line vortices. The discussion considers first the self-similar vortex, in which all quantities are assumed to depend only on the circulation at infinity, the Reynolds number, and the time from a virtual origin. It is argued that the turbulent line vortex has a triple structure: an outer vortex of given radius, an inner vortex, and a viscous core. The axial velocity in the core, produced by growth of a trailing vortex shown to be Reynolds number dependent. (Author).
Download or read book Classical Aerodynamic Theory written by and published by . This book was released on 1979 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Structure and Vorticity Transport on a Plunging Wing by : Azar Eslam Panah
Download or read book Flow Structure and Vorticity Transport on a Plunging Wing written by Azar Eslam Panah and published by . This book was released on 2014 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure and dynamics of the flow field created by a plunging flat plate airfoil are investigated at a chord Reynolds number of 10,000 while varying plunge amplitude and Strouhal number. Digital particle image velocimetry measurements are used to characterize the shedding patterns and the interactions between the leading and trailing edge vortex structures (LEV and TEV), resulting in the development of a wake classification system based on the nature and timing of interactions between the leading- and trailing-edge vortices. The convection speed of the LEV and its resulting interaction with the TEV is primarily dependent on reduced frequency; however, at Strouhal numbers above approximately 0.4, a significant influence of Strouhal number (or plunge amplitude) is observed in which LEV convection is retarded, and the contribution of the LEV to the wake is diminished. It is shown that this effect is caused by an enhanced interaction between the LEV and the airfoil surface, due to a significant increase in the strength of the vortices in this Strouhal number range, for all plunge amplitudes investigated. Comparison with low-Reynolds-number studies of plunging airfoil aerodynamics reveals a high degree of consistency and suggests applicability of the classification system beyond the range examined in the present work. Some important differences are also observed. The three-dimensional flow field was characterized for a plunging two-dimensional flat-plate airfoil using three-dimensional reconstructions of planar PIV data. Whereas the phase-averaged description of the flow field shows the secondary vortex penetrating the leading-edge shear layer to terminate LEV formation on the airfoil, time-resolved, instantaneous PIV measurements show a continuous and growing entrainment of secondary vorticity into the shear layer and LEV.
Book Synopsis The Turbulence Structure of Trailing Vortex Wakes by : Gordon J. Follin
Download or read book The Turbulence Structure of Trailing Vortex Wakes written by Gordon J. Follin and published by . This book was released on 1996 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis IUTAM Symposium on Dynamics of Slender Vortices by : Egon Krause
Download or read book IUTAM Symposium on Dynamics of Slender Vortices written by Egon Krause and published by Springer Science & Business Media. This book was released on 1998 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text records the proceedings of the IUTAM Symposium held in Aachen in 1997. It reviews theories based on asymptotic expansions and gives an insight into new computational methods. Some applications of these methods demonstrate their capability, for example the analysis of core structures with axial variation, the description of the interaction of filaments with a solid body and of sound generation by vortex rings, the theoretical approach to the reduction of drag by manipulating vortex structures in shear layers, the numerical simulation of merging vortex rings and of bubble-type vortex breakdown in a tube, and investigations of vortex flows in aircraft and helicopter applications. The articles comprise a wide variety of fundamental investigations and of advanced engineering applications. The book summarizes the state of the art and also communicates recent results of specific flow problems. It addresses the large readership experienced in the field of vortex dynamics.
Book Synopsis Theoretical and Experimental Aerodynamics by : Mrinal Kaushik
Download or read book Theoretical and Experimental Aerodynamics written by Mrinal Kaushik and published by Springer. This book was released on 2018-12-15 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is intended as a text for undergraduate and graduate courses in aerodynamics, typically offered to students of aerospace and mechanical engineering programs. It covers all aspects of aerodynamics. The book begins with a description of the standard atmosphere and basic concepts, then moves on to cover the equations and mathematical models used to describe and characterize flow fields, as well as their thermodynamic aspects and applications. Specific emphasis is placed on the relation between concepts and their use in aircraft design. Additional topics of interest to the reader are presented in the Appendix, which draws on the teachings provided in the text. The book is written in an easy to understand manner, with pedagogical aids such as chapter overviews, summaries, and descriptive and objective questions to help students evaluate their progress. Atmospheric and gas tables are provided to facilitate problem solving. Lastly, a detailed bibliography is included at the end of each chapter to provide students with further resources. The book can also be used as a text for professional development courses in aerodynamics.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis AIAA Journal by : American Institute of Aeronautics and Astronautics
Download or read book AIAA Journal written by American Institute of Aeronautics and Astronautics and published by . This book was released on 2008 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Trailing Vortices written by and published by . This book was released on 1969 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:
