Aircraft Drag Reduction Technology
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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
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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.
Aircraft Drag Reduction An Overview
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Author : Mohsen Jahanmiri
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2013-01
Aircraft Drag Reduction An Overview written by Mohsen Jahanmiri and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-01 with categories.
Aircraft drag reduction is a great challenge but there is certainly room for improvements. The drag breakdown of a civil transport aircraft shows that the skin friction drag and the lift-induced drag constitute the two main sources of drag, approximately one half and one third of the total drag for a typical long range aircraft at cruise conditions. This is why specific research on this topics have been initiated and it seems that Hybrid Laminar Flow technology and innovative wing tip devices offer the greatest potential. The aim of this review manuscript is to highlight the state of the art in aeronautical drag reduction, and also describe several emerging drag-reduction approaches that are either active or reactive/interactive.
Personal Aircraft Drag Reduction
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Author : Bruce H. Carmichael
language : en
Publisher:
Release Date : 2000
Personal Aircraft Drag Reduction written by Bruce H. Carmichael and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Drag (Aerodynamics) 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.
Proceedings Of The Nasa Industry University General Aviation Drag Reduction Workshop
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Author : Jan Roskam
language : en
Publisher:
Release Date : 1984
Proceedings Of The Nasa Industry University General Aviation Drag Reduction Workshop written by Jan Roskam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Drag (Aerodynamics) categories.
Drag Reduction An Industrial Challenge
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Author : J. P. Robert
language : en
Publisher:
Release Date : 1992
Drag Reduction An Industrial Challenge written by J. P. Robert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Over the last few decades and particularly since the 70s, all civil aircraft manufacturers have made great efforts to reduce aircraft drag. The long term aim of this operation is to reduce the specific consumption of aircraft, the potential reduction of over 10 % would represent savings of several million dollars for the airlines (fig. 1). The successive fuel crises (fig. 2) have increased the need for developing new technologies to be applied on the new aircraft; retrofits, however, also have their uses. Estimating the drag of a transport aircraft through calculation or wind tunnel tests must come as close as possible to the value obtained in flight. Forecast errors to the order of 1 % following wind tunnel/flight transposition lead to technical and financial penalties and entail vast efforts to bring the values obtained during flight down to acceptable levels guaranteed by the aircraft manufacturers to their customer airlines. The technologies or concepts that could significantly reduce aircraft drag often have a different reduction potential. This reduction must be clearly shown to appear in the high speed tests using large-scale models (1/10 scale).
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.
Aircraft Drag Reduction Through Extended Formation Flight
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Author : Simeon Andrew Ning
language : en
Publisher: Stanford University
Release Date : 2011
Aircraft Drag Reduction Through Extended Formation Flight written by Simeon Andrew Ning and has been published by Stanford University this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Formation flight has the potential to significantly reduce the fuel consumption of long range flights, even with existing aircraft. This research explores a safer approach to formation flying of transport aircraft, which we term extended formation flight. Extended formations take advantage of the persistence of cruise wakes and extend the streamwise separation between the aircraft by at least five wingspans. Classical aerodynamic theory suggests that the total induced drag of the formation should not change as the streamwise separation is increased, but the large separation distances of extended formation flight violate the simple assumptions of these theorems. At large distances, considerations such as wake rollup, atmospheric effects on circulation decay, and vortex motion become important to consider. We first examine the wake rollup process in the context of extended formations and develop an appropriate physics-based model. Using this model, this dissertation addresses three aspects of formation flight: longitudinally extended formations, compressibility effects, and formations of heterogeneous aircraft. Uncertainty analysis is used to investigate the induced drag savings of extended formations in the presence of variation in atmospheric properties, limitations of positioning accuracy, and uncertainty in model parameters. Next, the methodology is integrated with an Euler solver to assess the impact of compressibility while flying in formation. Finally, we examine the important considerations for optimally arranging formations of non-identical aircraft.
Nasa Research On Viscous Drag Reduction
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Author :
language : en
Publisher:
Release Date : 1982
Nasa Research On Viscous 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 1982 with categories.