Author : Anonim
Publisher : AIAA
Page : 542 pages
File Size : 47,9 Mb
Release : 1990
Category : Boundary layer
ISBN : 1600863787
Viscous Drag Reduction in Boundary Layers
Anonim
Viscous Drag Reduction In Boundary Layers
Viscous Drag Reduction In Boundary Layers Book in PDF, ePub and Kindle version is available to download in english. Read online anytime anywhere directly from your device. Click on the download button below to get a free pdf file of Viscous Drag Reduction In Boundary Layers book. This book definitely worth reading, it is an incredibly well-written.
Viscous Drag Reduction in Boundary Layers
Dennis M. Bushnell,Jerry N. Hefner
Author : Dennis M. Bushnell,Jerry N. Hefner
Publisher : Unknown
Page : 517 pages
File Size : 49,9 Mb
Release : 1990
Category : Boundary layer
ISBN : 1600865976
Viscous Drag Reduction in Boundary Layers by Dennis M. Bushnell,Jerry N. Hefner Pdf
Viscous Drag Reduction
C. Sinclair Wells
Author : C. Sinclair Wells
Publisher : Springer
Page : 497 pages
File Size : 47,7 Mb
Release : 2013-12-20
Category : Technology & Engineering
ISBN : 9781489955791
Viscous Drag Reduction by C. Sinclair Wells Pdf
Drag Reduction
American Institute of Chemical Engineers
Author : American Institute of Chemical Engineers
Publisher : Unknown
Page : 116 pages
File Size : 42,5 Mb
Release : 1971
Category : Drag (Aerodynamics)
ISBN : UOM:39076006507888
Drag Reduction by American Institute of Chemical Engineers Pdf
Recent Turbulent Drag Reduction Research at Langley Research Center
Anonim
Author : Anonim
Publisher : Unknown
Page : 18 pages
File Size : 51,9 Mb
Release : 1978
Category : Electronic
ISBN : NASA:31769000542566
Recent Turbulent Drag Reduction Research at Langley Research Center by Anonim Pdf
Boundary Layer Flow over Elastic Surfaces
Viktor V Babenko,Ho-Hwan Chun,Inwon Lee
Author : Viktor V Babenko,Ho-Hwan Chun,Inwon Lee
Publisher : Butterworth-Heinemann
Page : 632 pages
File Size : 49,7 Mb
Release : 2012-09-29
Category : Science
ISBN : 9780123948212
Boundary Layer Flow over Elastic Surfaces by Viktor V Babenko,Ho-Hwan Chun,Inwon Lee Pdf
While other methods of drag reduction are well-known in marine R&D and ship design environments worldwide, compliant coating drag reduction remains less well-known and poorly understood. This important book presents cutting-edge techniques and findings from research sources not generally accessible by Western researchers and engineers, aiding the application and further development of this potentially important technology. Beginning with an introduction to drag reduction that places the authors’ work on elastic surfaces and combined techniques in context, the book moves on to provide a comprehensive study of drag reduction through elastic coating with both flow and material properties considered. Coverage includes: Experimental findings around coherent vortical structures (CVS) in turbulent boundary layers and methods of controlling them Static and dynamic mechanical characteristics of elastic composite coatings, as well as new techniques and devices developed for their measurement Combined methods of flow control and drag reduction, including the effect of injection of polymer solutions, elastic coatings and generated longitudinal vortical structures on hydrodynamic resistance Intended as a reference for senior engineers and researchers concerned with the drag reduction and the dynamics of turbulent boundary layer flows, Boundary Layer Flow over Elastic Surfaces provides a unique source of information on compliant surface drag reduction and the experimental techniques around it that have shown measurable and repeatable improvements over recent years. This compilation of research findings and new techniques developed for measurement will aid R&D engineers, naval architects and senior designers in their quest to achieve drag reductions that will deliver significant efficiency savings. Unique source of information on compliant surface drag reduction—an important area of technology with practical application to ships—from otherwise inaccessible research studies Updates the knowledge-base on boundary layer flow and surface friction reduction, critical topics in the global quest for increased ship efficiency and fuel economy Reveals new techniques and devices developed for measurement and provides a comprehensive study of drag reduction through elastic coating with both flow and material properties covered
Laminar Drag Reduction
Keizo Watanabe
Author : Keizo Watanabe
Publisher : Bentham Science Publishers
Page : 107 pages
File Size : 40,5 Mb
Release : 2015-06-05
Category : Technology & Engineering
ISBN : 9781681080840
Laminar Drag Reduction by Keizo Watanabe Pdf
The phenomenon of resistance to motion through a fluid is believed to be a function of fluid-wall interaction. This theory is based on the assumption that under certain conditions a real fluid does not usually slip on the wall in contact with it and displays laminar flow. This set of conditions is known as a ‘no slip boundary condition’. But if a fluid is passed alongside a wall, the drag reduction in the laminar flow region can be calculated. In Laminar Drag Reduction, the frictional drag of an internal or an external fluid flow along a certain kind of hydrophobic wall is investigated. An analytic approach towards the mechanism of drag reduction is employed using Navier-Stokes existence and smoothness equations. The experimental results presented in this book show that frictional drag of a fluid alongside this hydrophobic wall decreases in comparison with fluid flow along a conventional wall or surface. This form of laminar drag reduction represents a relatively new area of research, where the laminar flow can be controlled by microscopic surface modifications, allowing fluid flows to slip over a wall. Laminar Drag Reduction brings information about some interesting phenomena related to fluid slippage on a highly water-repellent surface. Readers, physics graduates and senior researchers alike, can benefit from the information presented in this book to tackle more challenging questions in fluid mechanics research.
Viscous Drag Measurement and Its Application to Base Drag Reduction
Robert K. Decker
Author : Robert K. Decker
Publisher : Unknown
Page : 102 pages
File Size : 40,5 Mb
Release : 2002-05
Category : Diffraction patterns
ISBN : 1423510046
Viscous Drag Measurement and Its Application to Base Drag Reduction by Robert K. Decker Pdf
In this study two important topics have been investigated. First, a new automation procedure has been developed to detect fringe patterns in oil- film interferograms. The procedure combines a windowed Fourier transform and a cross correlation technique to determine regions where fringes are likely to reside. The cross correlation of a single cycle cosine function and the original intensity produce a filtered result that isolates the information being sought. The automation procedure is able to capture approximately 75% of the fringes in an image but additional refining of the technique could increase this percentage. Second, the effect of viscous fore-body drag on base drag has been investigated on a 2-D ramp model. Measurements made during the study include oil-film interferometry and hot-wire anemometry for viscous fore-body drag, and pressure measurements on the fore-body and base for fore-body and base drag. The results of this investigation show that an increase in viscous fore-body drag has very little effect on base drag, which contrasts previous studies where increases in viscous fore-body drag tended to decrease base drag. This means that a simple jet pumping mechanism is not the sole effect responsible for base drag reduction in this type of geometry. Hot-wire measurements in the wake of the model show that the flow in the base region is devoid of a dominant shedding frequency. It may be possible that the boundary layer somehow affects the vortex shedding mechanism but further investigations would be necessary to demonstrate that this is true.
Drag Reduction by Shock and Boundary Layer Control
Egon Stanewsky,J. Delery,John Fulker,Paolo de Matteis
Author : Egon Stanewsky,J. Delery,John Fulker,Paolo de Matteis
Publisher : Springer Science & Business Media
Page : 461 pages
File Size : 54,5 Mb
Release : 2013-11-11
Category : Technology & Engineering
ISBN : 9783540458562
Drag Reduction by Shock and Boundary Layer Control by Egon Stanewsky,J. Delery,John Fulker,Paolo de Matteis Pdf
The survival of the Aeronautical Industries of Europe in the highly competitive World Aviation Market is strongly dependent on such factors as time-to-market of a new or derivative aircraft and on its manufacturing costs but also on the achievement of a competitive technological advantage by which an increased market share can be gained. Recognizing this, cooperative research is continuously encouraged and co-financed by the European Union in order to strengthen the scientific and technological base of the Aeronautical Industries thus providing - among others - the technological edge needed for survival. Corresponding targets of research within Area 3, Technologies for Transport Means, and here in particular Area 3A, Aeronautics Technologies, of the Industrial and Materials Technologies Program ( Brite -EuRam III, 1994 -1998) have been identified to be aircraft efficiency, cost effectiveness and environmental impact. Concerning aircraft efficiency - relevant to the present research - a reduction in aircraft drag of 10%, a reduction in aircraft fuel consumption of 30%, and a reduction in airframe, engine and system weight of 20% are envisaged. Meeting these objectives has, of course, also a strong positive impact on the environment.
NASA Research on Viscous Drag Reduction
Anonim
Author : Anonim
Publisher : Unknown
Page : 32 pages
File Size : 44,9 Mb
Release : 1982
Category : Electronic
ISBN : NASA:31769000557846
NASA Research on Viscous Drag Reduction by Anonim Pdf
Analytical and Design Techniques for Drag Reduction Studies on Wavy Surfaces
Ramakrishna Balasubramanian
Author : Ramakrishna Balasubramanian
Publisher : Unknown
Page : 28 pages
File Size : 51,5 Mb
Release : 1980
Category : Drag (Aerodynamics)
ISBN : STANFORD:36105024668100
Analytical and Design Techniques for Drag Reduction Studies on Wavy Surfaces by Ramakrishna Balasubramanian Pdf
On the Theory of Compliant Wall Drag Reduction in Turbulent Boundary Layers
Robert L. Ash
Author : Robert L. Ash
Publisher : Unknown
Page : 52 pages
File Size : 52,9 Mb
Release : 1974
Category : Drag (Aerodynamics)
ISBN : UIUC:30112106678623
On the Theory of Compliant Wall Drag Reduction in Turbulent Boundary Layers by Robert L. Ash Pdf
Boundary Layer Effects
Anthony W. Fiore
Author : Anthony W. Fiore
Publisher : Unknown
Page : 962 pages
File Size : 54,6 Mb
Release : 1978
Category : Turbulent boundary layer
ISBN : UOM:39015095313683
Boundary Layer Effects by Anthony W. Fiore Pdf
In 1975 the U.S. Air Force and the Federal Republic of Germany signed a Data Exchange Agreement numbered AF-75-G-7440 entitled 'Viscous and Interacting Flow Fields.' The purpose was to exchange data in the area of boundary layer research. It includes both experimental and theoretical boundary layer research at speeds from subsonic to hypersonic Mach numbers in the presence of laminar, transitional, and turbulent boundary layers. The main effort in recent years has been on turbulent boundary layers, both attached and separated in the presence of such parameters as pressure gradients, wall temperature, surface roughness, etc. In the United States the research was conducted in various Department of Defense, NASA, aircraft corporations, and various university laboratories. In the Federal Republic of Germany it was carried out within the various DFVLR, industrial, and university research centers.
Structure of Turbulence and Drag Reduction
Albert Gyr
Author : Albert Gyr
Publisher : Springer Science & Business Media
Page : 617 pages
File Size : 47,8 Mb
Release : 2012-12-06
Category : Science
ISBN : 9783642509711
Structure of Turbulence and Drag Reduction by Albert Gyr Pdf
In 1976 a similar titled IUTAM Symposium (Structure of Turbulence and Drag Reduction) was held in Washington . However, the progress made during the last thirteen years as weil as the much promising current research desired a second one this year. In Washington drag reduction by additives and by direct manipulation of the walls (compliant walls and heated surfaces) were discussed. In the meantime it became evident that drag reduction also occurs when turbulence is influenced by geometrical means, e.g. by influencing the pressure distribution by the shape of the body (airfoils) or by the introduction of streamwise perturbances on a body (riblets). In the recent years turbulence research has seen increasing attention being focused on the investigation of coherent structures, mainly in Newtonian fluids. We all know that these structures are a significant feature of turbulent flows, playing an important role in the energy balance in such flows. However their place in turbulence theories as weil as the factors influencing their development are still poorly understood. Consequently, the investigation of phenomena in which the properties of coherent structures are alte red provides a promising means of improving our understanding of turbulent flows in general.
Drag Reduction of Turbulent Flows by Additives
A. Gyr,H.-W. Bewersdorff
Author : A. Gyr,H.-W. Bewersdorff
Publisher : Springer Science & Business Media
Page : 243 pages
File Size : 49,8 Mb
Release : 2013-03-09
Category : Technology & Engineering
ISBN : 9789401712958
Drag Reduction of Turbulent Flows by Additives by A. Gyr,H.-W. Bewersdorff Pdf
Drag Reduction of Turbulent Flows by Additives is the first treatment of the subject in book form. The treatment is extremely broad, ranging from physicochemical to hydromechanical aspects. The book shows how fibres, polymer molecules or surfactants at very dilute concentrations can reduce the drag of turbulent flow, leading to energy savings. The dilute solutions are considered in terms of the physical chemistry and rheology, and the properties of turbulent flows are presented in sufficient detail to explain the various interaction mechanisms. Audience: Those active in fundamental research on turbulence and those seeking to apply the effects described. Fluid mechanical engineers, rheologists, those interested in energy saving methods, or in any other application in which the flow rate in turbulent flow should be increased.
