Drag Reduction Technologies
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Aerodynamic Drag Reduction Technologies
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Author : Peter Thiede
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29
Aerodynamic Drag Reduction Technologies written by Peter Thiede and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Technology & Engineering categories.
------------------------------------------------------------ This volume contains the Proceedings of the CEAS/DragNet European Drag Reduction Conference held on 19-21 June 2000 in Potsdam, Germany. This conference, succeeding the European Fora on Laminar Flow Technology 1992 and 1996, was initiated by the European Drag Reduction Network (DragNet) and organised by DGLR under the auspice of CEAS. The conference addressed the recent advances in all areas of drag reduction research, development, validation and demonstration including laminar flow technology, adaptive wing concepts, turbulent and induced drag reduction, separation control and supersonic flow aspects. This volume which comprises more than 40 conference papers is of particular interest to engineers, scientists and students working in the aeronautics industry, research establishments or academia.
Drag Reduction Technologies
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Author : V.-T. Truong
language : en
Publisher:
Release Date : 2001
Drag Reduction Technologies written by V.-T. Truong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Coatings categories.
Diluted polymer solutions, surfactants, microbubbles and compliant coating as drag reducers have been reviewed in this report. The advantages and disadvantages of each method have been discussed. For the polymer solutions, it is possible to achieve up to 80 % drag reduction with only a few parts per million of polymer. Ionic and non-ionic surfactants can also offer similar drag reduction as polymer solutions but at a high concentration of few percent. Microbubbles are perhaps the cheapest and non-polluted drag reducer. However, the control of the bubble size and the angle of ejection can impose technical challenges. This method can be combined with other drag reduction (DR) technologies such as polymers to enhance its effectiveness. Compliant coating can be designed to behave in a similar fashion to the skin of a dolphin.The development of the compliant coating is theoretically complicated, although the optimized coating can offer a DR up to 50%. Despite the extensive research in the area of DR over the past four decades, for each DR technology there is no universally accepted model that explains the DR mechansim. Application fo DR technology with microbubbles to the ship hull indicated a 10 -15 % reduction in drag. The full scale testing of a submarine by the US NAvy has shoen that polymer ejection has the potential to reduce the self-noise, darg and radiated noise generated by the propellor.
Turbulent Drag Reduction By Surfactant Additives
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Author : Feng-Chen Li
language : en
Publisher: John Wiley & Sons
Release Date : 2012-01-10
Turbulent Drag Reduction By Surfactant Additives written by Feng-Chen Li and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-01-10 with Science categories.
Turbulent drag reduction by additives has long been a hot research topic. This phenomenon is inherently associated with multifold expertise. Solutions of drag-reducing additives are usually viscoelastic fluids having complicated rheological properties. Exploring the characteristics of drag-reduced turbulent flows calls for uniquely designed experimental and numerical simulation techniques and elaborate theoretical considerations. Pertinently understanding the turbulent drag reduction mechanism necessities mastering the fundamentals of turbulence and establishing a proper relationship between turbulence and the rheological properties induced by additives. Promoting the applications of the drag reduction phenomenon requires the knowledge from different fields such as chemical engineering, mechanical engineering, municipal engineering, and so on. This book gives a thorough elucidation of the turbulence characteristics and rheological behaviors, theories, special techniques and application issues for drag-reducing flows by surfactant additives based on the state-of-the-art of scientific research results through the latest experimental studies, numerical simulations and theoretical analyses. Covers turbulent drag reduction, heat transfer reduction, complex rheology and the real-world applications of drag reduction Introduces advanced testing techniques, such as PIV, LDA, and their applications in current experiments, illustrated with multiple diagrams and equations Real-world examples of the topic’s increasingly important industrial applications enable readers to implement cost- and energy-saving measures Explains the tools before presenting the research results, to give readers coverage of the subject from both theoretical and experimental viewpoints Consolidates interdisciplinary information on turbulent drag reduction by additives Turbulent Drag Reduction by Surfactant Additives is geared for researchers, graduate students, and engineers in the fields of Fluid Mechanics, Mechanical Engineering, Turbulence, Chemical Engineering, Municipal Engineering. Researchers and practitioners involved in the fields of Flow Control, Chemistry, Computational Fluid Dynamics, Experimental Fluid Dynamics, and Rheology will also find this book to be a much-needed reference on the topic.
Aircraft Drag Reduction Technology
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Author : A. S. W. Thomas
language : en
Publisher:
Release Date : 1984
Aircraft Drag Reduction Technology written by A. S. W. Thomas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
This paper reviews the current techniques of aircraft viscous drag reduction and some of the more recent developments that have taken place in this technology. The various sources and relative contributions of aircraft drag are described including skin friction drag, pressure drag, interference drag and lift induced drag. In the discussion, emphasis is given to the physical processes that lead to these drag contributions, followed by a discussion of methods of reducing the impact of these drag sources. Finally some brief discussion is presented to show how innovative and optimized aircraft configurations can lead to drag benefits.
Aerodynamic Drag Reduction Technologies Testing Of Heavy Duty Vocational Vehicles And A Dry Van Trailer
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Author :
language : en
Publisher:
Release Date : 2016
Aerodynamic Drag Reduction Technologies Testing Of Heavy Duty Vocational Vehicles And A Dry Van Trailer written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
This study focused on two accepted methods for quantifying the benefit of aerodynamic improvement technologies on vocational vehicles: the coastdown technique, and on-road constant speed fuel economy measurements. Both techniques have their advantages. Coastdown tests are conducted over a wide range in speed and allow the rolling resistance and aerodynamic components of road load force to be separated. This in turn allows for the change in road load and fuel economy to be estimated at any speed, as well as over transient cycles. The on-road fuel economy measurements only supply one lumped result, applicable at the specific test speed, but are a direct measurement of fuel usage and are therefore used in this study as a check on the observed coastdown results. Resulting coefficients were then used to populate a vehicle model and simulate expected annual fuel savings over real-world vocational drive cycles.
Mitigation Of Hydrodynamic Resistance Methods To Reduce Hydrodynamic Drag
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Author : Marc Perlin
language : en
Publisher: World Scientific
Release Date : 2014-11-18
Mitigation Of Hydrodynamic Resistance Methods To Reduce Hydrodynamic Drag written by Marc Perlin and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-11-18 with Technology & Engineering categories.
This text presents the state of the art in friction drag/resistance reduction technologies for BODIES and crafts operating in liquids at and beneath the free surface. It is useful for professionals with backgrounds in advanced fluid dynamics as well as by academics teaching introductory graduate courses in this area. Active control of resistance will include a discussion of friction reduction, for example through the injection of gas that can form air layers and polymers that initially reside adjacent to the hull, including the use of partial and super cavities. The book discusses passive resistance control achieved through changes in the overall hull shape and appendages, including the application of lifting bodies, bulbous bows, and stern flaps. It also addresses passive reduction of skin friction through the application of hull coatings and other elements of hull husbandry.
Drag Reduction In Fluid Flows
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Author : Robert H. J. Sellin
language : en
Publisher:
Release Date : 1989
Drag Reduction In Fluid Flows written by Robert H. J. Sellin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Boundary layer control categories.
Drag Reduction By Shock And Boundary Layer Control
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Author : Egon Stanewsky
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-11
Drag Reduction By Shock And Boundary Layer Control written by Egon Stanewsky and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-11 with Technology & Engineering categories.
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.
Experimental Studies On The Physics And Technology Of Polymer Drag Reduction
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Author :
language : en
Publisher:
Release Date : 2004
Experimental Studies On The Physics And Technology Of Polymer Drag Reduction written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Experimental studies of polymer drag-reduction were carried out in the laboratory of Thomas J. Hanratty. Companion studies were carried out in the polymer laboratory of Anthony J. McHugh so that the performance of drag-reducing polymer solutions can be related to their rheological and rheo-optical properties in simple non-turbulent flows. The work was influenced by the notion that aggregation of polymer molecules could be an important role. A remarkable finding is that molecular weight and molecular weight distribution need not change as the drag-reducing ability of the polymer solution degraded. Rheo-optical studies in a Couette device showed that effective polymer solutions develop turbidity over a range of shear rates characteristic of those used in the flow loop. This study shows that the drag reduction can be enhanced by using mixing and delivery procedures which enhance the formation aggregates.
Viscous Drag Reduction In Boundary Layers
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Author :
language : en
Publisher: AIAA
Release Date : 1990
Viscous Drag Reduction In Boundary Layers written by and has been published by AIAA this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Boundary layer categories.