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Author : D. Arzoglou
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.:/5 (11 download)
Download or read book Bluff-body Drag Reduction as a Result of Base Flow Injection written by D. Arzoglou and published by . This book was released on 2003 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ty A. Walsh
Publisher :
ISBN 13 :
Total Pages : 306 pages
Book Rating : 4.:/5 (318 download)
Download or read book Base Drag Reduction on a Bluff Body Using Zero and Non-zero Net Mass Flux Excitations written by Ty A. Walsh and published by . This book was released on 2008 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Involves setting up up a particle image velocimetry laboratory for Cal Poly, and investigating the effect of both zero and non-zero net mass flow injection at the trailing edge of a bluff body model with a 45-degree exit plane trajectory.
Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (18 download)
Download or read book Aerodynamic Drag Reduction for a Simple Bluff Body Using Base Bleed written by and published by . This book was released on 2003 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Raymond Sedney
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (227 download)
Download or read book A Flow Model for the Effect of A Slanted Base on Drag written by Raymond Sedney and published by . This book was released on 1981 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments by Morel have shown that slanting the base of a bluff body causes large variations in the drag, as the slant angle changes. For a particular, critical slant angle the drag changes discontinuously. This phenomenon was correlated with a drastic change in the type of base flow. A mechanism to explain this change, and therefore, the discontinuity in drag, is proposed. The basis of the mechanism is breakdown of the side edge vortices. An estimate of the swirl angle in these vortices is obtained using a swept-back mixing zone solution. This swirl angle and the other elements of the theory provide an estimate for the critical slant angle that is entirely consistent with the observed value. (Author).
Author : James E. Knight
Publisher :
ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.:/5 (563 download)
Download or read book An Experimental Study of Base Drag Reduction of a Bluff Body written by James E. Knight and published by . This book was released on 2004 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study to explore the base-drag reduction with passive control means, to determine the effects of boundary-layer displacement thickness and shape factor at the trailing edge, and to understand vortex dynamics and its suction effects using the phase-averaged pressure.
Author : Vibhav Durgesh
Publisher :
ISBN 13 : 9780549743125
Total Pages : 123 pages
Book Rating : 4.7/5 (431 download)
Download or read book Experimental Study of Near Wake Dynamics Associated with Bluff Body Base Drag Reduction written by Vibhav Durgesh and published by . This book was released on 2008 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation studies in detail the changes occurring in near wake dynamics associated with base drag reduction on bluff bodies achieved via boundary layer modification. A wedge model and a flat plate model are used to study bluff bodies over a range of Reynolds number of 0.8 x 10 6 -0.3 x 10 6 . The boundary layer on both these models is modified using fore-body surface roughness, by applying sand grains with a mean diameter of 2.2 mm to their fore-body surfaces. Particle Image Velocimetry (PIV) measurements, as well as simultaneous PIV and time-resolved base pressure measurements, are performed on these models in order to determine the near wake changes associated with base drag reduction. For the wedge model, the PIV measurements capture a downstream region of x/h = 0-1.5, whereas, for the flat plate model, the PIV measurements are performed at three different distances downstream, x/h = 0-7, 7-14 and 14-21. The PIV results are analyzed using Proper Orthogonal Decomposition (POD) in order to identify the changes in coherent structures associated with base drag reduction. It is observed from the POD results that, when there is a reduction in base drag, the vortex shedding in the near wake becomes more organized, its strength decreases, and the vortex convects faster. This result differs from those obtained in earlier studies, where base drag reduction is achieved by interrupting vortex shedding. In order to reconstruct near wake dynamics simultaneous PIV and time-resolved pressure measurements are used. Using Linear Stochastic Estimation (LSE)-POD technique, the cycle-to-cycle variation in vortex shedding is accurately captured. It is observed from the reconstruction that for the smooth test cases, the cycle-to-cycle variations in the vortex shedding are significantly higher, as compared to the rough test cases.
Author : Tom Shtendel
Publisher :
ISBN 13 :
Total Pages : 127 pages
Book Rating : 4.:/5 (875 download)
Download or read book Fundamentals of Bluff Body Drag Reduction by Active Flow Control written by Tom Shtendel and published by . This book was released on 2012 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Apparatus And Method For Reducing Drag Of A Bluff Body In Ground Effect Using Counter-Rotating Vortex Pairs written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An aerodynamic base drag reduction apparatus and method for bluff bodies, such as tractor-trailer trucks, utilizing a pair of lift surfaces extending to lift surface tips and located alongside the bluff body such as on opposing left and right side surfaces. In a flowstream substantially parallel to the longitudinal centerline of the bluff body, the pair of lift surfaces generate a pair of counter-rotating trailing vortices which confluence together in the wake of the bluff body in a direction orthogonal to the flowstream. The confluence draws or otherwise turns the flowstream, such as the flowstream passing over a top surface of the bluff body, in and around behind a trailing end of the bluff body to raise the pressure on a base surface at the trailing end and thereby reduce the aerodynamic base drag.
Author : Jacob T. Whiteman
Publisher :
ISBN 13 :
Total Pages : 81 pages
Book Rating : 4.:/5 (951 download)
Download or read book Active Flow Control Schemes for Bluff Body Drag Reduction written by Jacob T. Whiteman and published by . This book was released on 2016 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discoveries are then used to study similar controls on the three-dimensional bluff body based on those of the two-dimensional model. For the 3-D simulations the Large Eddy Simulation model is used for the calculation of flow field variables within Fluent, however an introductory RANS analysis is performed as well. Control schemes involving suction jets are investigated. Aspects of the flow pattern such as shedding and streamlines are studied in depth in an effort to determine the most efficient application of the suction controls. These schemes seek to reduce the aerodynamic drag without constraints on the basic design of the model itself. An average of 10\% drag reduction is recorded.
Author :
Publisher :
ISBN 13 :
Total Pages : 692 pages
Book Rating : 4.:/5 (3 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hanns-Joachim Schmidt
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (113 download)
Download or read book Drag Reduction of a Bluff Body Model in Water and Air written by Hanns-Joachim Schmidt and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : F. G. Howard
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (228 download)
Download or read book Axisymmetric Bluff-Body Drag Reduction Through Geometrical Modifications written by F. G. Howard and published by . This book was released on 1984 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of shoulder radiusing and grooving (longitudinally or circumferentially) the afterbodies of bluff bodies to reduce the base drag at low speeds is discussed. Shoulder radii as large as 2.75 body diameters are examined. Reynolds number based on body diameter varied from 20,000 to 200,000. Results indicate that increasing the shoulder radius to 2.75 body diameters can reduce the drag levels to those of a streamline body having 67 percent greater fineness ratio. For the relatively sharp shoulder case, body drag reductions as large as 50% are obtained using circumferential or longitudinal grooves. (Author).
Author : Paul K. Chang
Publisher : Elsevier
ISBN 13 : 1483181286
Total Pages : 800 pages
Book Rating : 4.4/5 (831 download)
Download or read book Separation of Flow written by Paul K. Chang and published by Elsevier. This book was released on 2014-06-28 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interdisciplinary and Advanced Topics in Science and Engineering, Volume 3: Separation of Flow presents the problem of the separation of fluid flow. This book provides information covering the fields of basic physical processes, analyses, and experiments concerning flow separation. Organized into 12 chapters, this volume begins with an overview of the flow separation on the body surface as discusses in various classical examples. This text then examines the analytical and experimental results of the laminar boundary layer of steady, two-dimensional flows in the subsonic speed range. Other chapters consider the study of flow separation on the two-dimensional body, flow separation on three-dimensional body shape and particularly on bodies of revolution. This book discusses as well the analytical solutions of the unsteady flow separation. The final chapter deals with the purpose of separation flow control to raise efficiency or to enhance the performance of vehicles and fluid machineries involving various engineering applications. This book is a valuable resource for engineers.
Author : Tim C. Lieuwen
Publisher : Cambridge University Press
ISBN 13 : 1139576836
Total Pages : 427 pages
Book Rating : 4.1/5 (395 download)
Download or read book Unsteady Combustor Physics written by Tim C. Lieuwen and published by Cambridge University Press. This book was released on 2012-08-27 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developing clean, sustainable energy systems is a pre-eminent issue of our time. Most projections indicate that combustion-based energy conversion systems will continue to be the predominant approach for the majority of our energy usage. Unsteady combustor issues present the key challenge associated with the development of clean, high-efficiency combustion systems such as those used for power generation, heating or propulsion applications. This comprehensive study is unique, treating the subject in a systematic manner. Although this book focuses on unsteady combusting flows, it places particular emphasis on the system dynamics that occur at the intersection of the combustion, fluid mechanics and acoustic disciplines. Individuals with a background in fluid mechanics and combustion will find this book to be an incomparable study that synthesises these fields into a coherent understanding of the intrinsically unsteady processes in combustors.
Author :
Publisher :
ISBN 13 :
Total Pages : 588 pages
Book Rating : 4.X/5 (3 download)
Download or read book Proceedings written by and published by . This book was released on 1984 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Tapan Kumar Sengupta
Publisher : World Scientific
ISBN 13 : 9814635162
Total Pages : 551 pages
Book Rating : 4.8/5 (146 download)
Download or read book Advances in Computation, Modeling and Control of Transitional and Turbulent Flows written by Tapan Kumar Sengupta and published by World Scientific. This book was released on 2015-12-01 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The role of high performance computing in current research on transitional and turbulent flows is undoubtedly very important. This review volume provides a good platform for leading experts and researchers in various fields of fluid mechanics dealing with transitional and turbulent flows to synergistically exchange ideas and present the state of the art in the fields. Contributed by eminent researchers, the book chapters feature keynote lectures, panel discussions and the best invited contributed papers."--
Author : Gino Sovran
Publisher : Springer Science & Business Media
ISBN 13 : 1468484346
Total Pages : 381 pages
Book Rating : 4.4/5 (684 download)
Download or read book Aerodynamic Drag Mechanisms of Bluff Bodies and Road Vehicles written by Gino Sovran and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: These Proceedings contain the papers and oral discussions presented at the Symposium on AERODYNAMIC DRAG MECHANISMS of Bluff Bodies and Road Vehides held at the General Motors Research Laboratories in Warren, Michigan, on September 27 and 28, 1976. This international, invitational Symposium was the twentieth in an annual series, each one having been in a different technical discipline. The Symposia provide a forum for areas of science and technology that are of timely interest to the Research Laboratories as weIl as the technical community at large, and in which personnel of the Laboratories are actively involved. The Symposia furnish an opportunity for the exchange of ideas and current knowledge between participating research specialists from educational, industrial arid governmental institutions and serve to stimulate future research activity. The present world-wide energy situation makes it highly desirable to reduce the force required to move road vehicles through the atmosphere. A significant amount of the total energy consumed for transportation is expended in overcoming the aerodynamic resistance to motion of these vehicles. Reductions in this aerodynamic drag can therefore have a large impact on ground transportation energy requirements. Although aerodynamic development work on road vehides has been performed for many years, it has not been widely reported or accompanied by much basic research.
