Download or read book Stability of Symmetric Vortices Over Slender Conical Bodies at High Angles of Attack written by Jinsheng Cai and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stability of Symmetric and Asymmetric Vortex Pairs Over Slender Conical Wings and Bodies written by Jinsheng Cai and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stability of Symmetric and Asymmetric Vortex Pairs Over Slender Conical Wing body Combinations written by Jinsheng Cai and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vorticity and Vortex Dynamics written by Jie-Zhi Wu and published by Springer Science & Business Media. This book was released on 2007-04-20 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a comprehensive and intensive monograph for scientists, engineers and applied mathematicians, as well as graduate students in fluid dynamics. It starts with a brief review of fundamentals of fluid dynamics, with an innovative emphasis on the intrinsic orthogonal decomposition of fluid dynamic process, by which one naturally identifies the content and scope of vorticity and vortex dynamics. This is followed by a detailed presentation of vorticity dynamics as the basis of later development. In vortex dynamics part the book deals with the formation, motion, interaction, stability, and breakdown of various vortices. Typical vortex structures are analyzed in laminar, transitional, and turbulent flows, including stratified and rotational fluids. Physical understanding of vertical flow phenomena and mechanisms is the first priority throughout the book. To make the book self-contained, some mathematical background is briefly presented in the main text, but major prerequisites are systematically given in appendices. Material usually not seen in books on vortex dynamics is included, such as geophysical vortex dynamics, aerodynamic vortical flow diagnostics and management.

Download or read book Frontiers of Computational Fluid Dynamics 2006 written by David A. Caughey and published by World Scientific. This book was released on 2005 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series of volumes to which this book belongs honors contributors who have made a major impact in computational fluid dynamics. This fourth volume in the series is dedicated to David Caughey on the occasion of his 60th birthday. The first volume was published in 1994 and was dedicated to Prof Antony Jameson. The second, dedicated to Earl Murman, was published in 1998. The third volume was dedicated to Robert MacCormack in 2002. Written by leading researchers from academia, government laboratories, and industry, the contributions in this volume present descriptions of the latest developments in techniques for numerical analysis of fluid flow problems, as well as applications to important problems in industry.

Download or read book 41st AIAA Aerospace Sciences Meeting Exhibit written by and published by . This book was released on 2003 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book AIAA Aerospace Sciences Meeting and Exhibit 42nd written by and published by . This book was released on 2004 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Comprehensive Study of Vortex Asymmetry on Slender Bodies at High Angles of Incidence written by Roopesh Sampath Kumar and published by . This book was released on 2021 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vortex asymmetry develops on slender bodies at high angles of incidence, leading to large side-forcesand yaw moments even in symmetrical flight conditions. This unexpected side force can be large for the control surfaces to produce a restoring moment, thereby affecting the vehicle's trajectory, maneuverability, and performance. Previous studies suggest that the presence of random micro-surface imperfections near the forebody tip, incurred due to the conventional machining process and its coupling with incoming freestream turbulence are the cause for vortex asymmetry. Vortex asymmetry and its control studies have been the subject of numerous experimental and numerical investigations beginning with simplified canonical configurations such as cones and cone-cylinders followed by slender bodies with fins resembling a typical projectile configuration. While previous studies on vortex asymmetry have provided a substantial knowledge base, several fundamental questions about the flow topology and characteristics of the vortices remain unanswered. The key knowledge gaps in the form of a few questions are: what is the effect of aftbody on the initiation and development of vortex asymmetry? What is the role of imperfections on the aftbody, and how do they enhance or suppress vortex asymmetry? What is the role of forebody to aftbody transition junction on vortex initiation and development? How does the forebody vortex-fin interaction alter the control surface effectiveness? To answer some of these questions as research objectives and improve the understanding of flow physics associated with slender bodies at high angles of incidence, a comprehensive experimental and numerical investigation was carried out and the results are presented here. The test configuration involves a long slender body with two interchangeable forebodies (a cone and a tangent ogive). To study the vortex-fin interactions, Army Navy Basic Finner (conecylinder with fins) and ogive-cylinder with fins were designed and tested. Experiments include force measurements using a six-component strain gauge balance, oil flow visualization, velocity and vorticity field measurements using particle image velocimetry. Results show that a pair of counterrotating, nearly-symmetric vortices develop over a polished cone but those become asymmetric over the cylinder. Several secondary shear-layer vortices form at the cone-cylinder junction and over the aftbody due to sharp turn angle (a change on pressure boundary), surface imperfections, and various surface joints. These secondary shear-layer vortices then merge with the primary forebody vortex pair, leading to the flow asymmetry. The flow characteristics and side-forces vary significantly when the conical forebody is rotated about its axis of symmetry and set to different azimuthal positions. The results strongly suggest that a change in the geometry at the cone-cylinder junction and surface imperfections present on the cylindrical aftbody plays a critical role in determining the overall flowasymmetry and the side force magnitude. The effect of forebody change has a significant impact on the flow field development. The peak vorticity, circulation, and trajectory of primary vortices for ogive-cylinder configuration indicate a notable change in both magnitude and location when compared to cone-cylinder configuration. The results show that the formation of secondary shearlayer vortices can be minimized by eliminating the sudden change in geometry and smoothing the surface imperfections. The absence of secondary shear-layer vortices resulted in relatively low levels of side forces for the ogive-cylinder configuration as compared to the cone-cylinder. In the case of vortex-fin interaction investigations, results show that the basic aerodynamic characteristics remain invariant with roll orientation at low angles of incidence. At high angles of incidence, fin orientation plays a significant role in dictating the body's aerodynamic forces. At low angles of incidence, the forebody vortices are symmetric and remain close to the body, and interact with the control surfaces. The forebody vortex interaction seems to be influenced by the body roll orientation. The pressure distributions over the fin surfaces, and in turn, the fins' control effectiveness is significantly affected by the interaction of forebody vortices. At high angles of incidence, the vortices become highly asymmetric, where one vortex is closer to the fins and the other vortex lifted away from the fins. Under such an instance, the resulting pressure distribution is uneven and lead to the generation of side forces and adverse yaw moments. To summarize, the present study has significantly improved the fundamental understanding of vortex flows on slender bodies at high angles of incidence. In particular, it has answered the role of secondary vortices on the development of overall vortex asymmetry and its interaction with control surfaces. The outcome of this study will help guide the design of next-generation projectiles expected to perform maneuvers at high angles of incidence. The high-fidelity experimental database generated over a range of test conditions will be very useful to validate physics based simulation tools being developed at Army Research Laboratory. The present study was focused at low-speeds and incompressible flows and therefore it is suggested that future studies must investigate the effect of compressibility on vortex asymmetry. Also, time-resolved measurements are recommended to understand the role of vortex dynamics on the slender body.

Download or read book 43rd AIAA Aerospace Sciences Meeting Exhibit written by and published by . This book was released on 2005 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Angle of Attack Aerodynamics written by Josef Rom and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aerodynamics of aircraft at high angles of attack is a subject which is being pursued diligently, because the modern agile fighter aircraft and many of the current generation of missiles must perform well at very high incidence, near and beyond stall. However, a comprehensive presentation of the methods and results applicable to the studies of the complex aerodynamics at high angle of attack has not been covered in monographs or textbooks. This book is not the usual textbook in that it goes beyond just presenting the basic theoretical and experimental know-how, since it contains reference material to practical calculation methods and technical and experimental results which can be useful to the practicing aerospace engineers and scientists. It can certainly be used as a text and reference book for graduate courses on subjects related to high angles of attack aerodynamics and for topics related to three-dimensional separation in viscous flow courses. In addition, the book is addressed to the aerodynamicist interested in a comprehensive reference to methods of analysis and computations of high angle of attack flow phenomena and is written for the aerospace scientist and engineer who is familiar with the basic concepts of viscous and inviscid flows and with computational methods used in fluid dynamics.

Download or read book Handbook of Supersonic Aerodynamics written by D. Adamson and published by . This book was released on 1961 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evolution of Forebody Vortices Over Slender Bodies at High Angles of Attack written by Moran Bercovici and published by . This book was released on 2006 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Supersonic Aerodynamics written by Johns Hopkins University. Applied Physics Laboratory and published by . This book was released on 1961 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aerospace America written by and published by . This book was released on 2001 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1973 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Flight Stability and Automatic Control written by Robert C. Nelson and published by WCB/McGraw-Hill. This book was released on 1998 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of Flight Stability and Automatic Control presents an organized introduction to the useful and relevant topics necessary for a flight stability and controls course. Not only is this text presented at the appropriate mathematical level, it also features standard terminology and nomenclature, along with expanded coverage of classical control theory, autopilot designs, and modern control theory. Through the use of extensive examples, problems, and historical notes, author Robert Nelson develops a concise and vital text for aircraft flight stability and control or flight dynamics courses.