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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 : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309058791
Total Pages : 1100 pages
Book Rating : 4.3/5 (9 download)
Download or read book Twenty-First Symposium on Naval Hydrodynamics written by National Research Council and published by National Academies Press. This book was released on 1997-09-11 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 : 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 : Gargeshwari Suryanarayana
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783838311036
Total Pages : 180 pages
Book Rating : 4.3/5 (11 download)
Download or read book Aerodynamic Drag Reduction of Bluff Bodies written by Gargeshwari Suryanarayana and published by LAP Lambert Academic Publishing. This book was released on 2010-06 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerodynamics of bluff bodies has gained the attention of aerodynamicists all over the world in recent times, primarily because of importance given to drag reduction by the automobile industry. Since pressure drag accounts for bulk of the drag of bluff bodies, any technique to manipulate and control the overall pressure field around such bodies to achieve base pressure rise causes reduction of drag. Interestingly, not many works are found on 3- dimensional bluff bodies such as spheres. Currently, interest in spherical airships is growing, triggered by the tourism industry. However, the high drag and management of highly unsteady wake of spheres are some of the aerodynamic issues that need to be addressed. This book offers the concept of passive natural ventilation as a potential solution. Natural ventilation occurs when the stagnation zone and the base are interconnected through an internal duct, which causes a jet flow through the center. Based on several years of experimental research, it is shown that natural ventilation of a sphere leads to substantial drag reduction and reduced wake unsteadiness at high Reynolds numbers.
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 : 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 : Wolf-Heinrich Hucho
Publisher : Elsevier
ISBN 13 : 1483102076
Total Pages : 577 pages
Book Rating : 4.4/5 (831 download)
Download or read book Aerodynamics of Road Vehicles written by Wolf-Heinrich Hucho and published by Elsevier. This book was released on 2013-10-22 with total page 577 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerodynamics of Road Vehicles details the aerodynamics of passenger cars, commercial vehicles, sports cars, and race cars; their external flow field; as well as their internal flow field. The book, after giving an introduction to automobile aerodynamics and some fundamentals of fluid mechanics, covers topics such as the performance and aerodynamics of different kinds of vehicles, as well as test techniques for their aerodynamics. The book also covers other concepts related to automobiles such as cooling systems and ventilations for vehicles. The text is recommended for mechanical engineers and phycisists in the automobile industry who would like to understand more about aerodynamics of motor vehicles and its importance on the field of road safety and automobile production.
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.
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 : Rowan Brackston
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)
Download or read book Feedback Control of Three-dimensional Bluff Body Wakes for Efficient Drag Reduction written by Rowan Brackston and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Diego Rodriguez Arcas
Publisher :
ISBN 13 :
Total Pages : 326 pages
Book Rating : 4.:/5 (548 download)
Download or read book Mixing Enhancement of Jets and Drag Reduction in Manipulated Bluff Body Wakes written by Diego Rodriguez Arcas and published by . This book was released on 2003 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 1562 pages
Book Rating : 4.3/5 (91 download)
Download or read book NBS Special Publication written by and published by . This book was released on 1973 with total page 1562 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jinjun Wang
Publisher : Cambridge University Press
ISBN 13 : 1107161568
Total Pages : 293 pages
Book Rating : 4.1/5 (71 download)
Download or read book Flow Control Techniques and Applications written by Jinjun Wang and published by Cambridge University Press. This book was released on 2019 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master the theory, applications and control mechanisms of flow control techniques.
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:
Author : François Lesage
Publisher :
ISBN 13 :
Total Pages : 180 pages
Book Rating : 4.:/5 (66 download)
Download or read book A Method for Drag Reduction on Bluff Bodies written by François Lesage and published by . This book was released on 1983 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
