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Author : Bruce H. Carmichael
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.0/5 ( download)
Download or read book Personal Aircraft Drag Reduction written by Bruce H. Carmichael and published by . This book was released on 2000 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mohsen Jahanmiri
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659336423
Total Pages : 72 pages
Book Rating : 4.3/5 (364 download)
Download or read book Aircraft Drag Reduction: An Overview written by Mohsen Jahanmiri and published by LAP Lambert Academic Publishing. This book was released on 2013-01 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Peter Thiede
Publisher : Springer Science & Business Media
ISBN 13 : 3540453598
Total Pages : 382 pages
Book Rating : 4.5/5 (44 download)
Download or read book Aerodynamic Drag Reduction Technologies written by Peter Thiede and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: ------------------------------------------------------------ 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.
Author : Simeon Andrew Ning
Publisher : Stanford University
ISBN 13 :
Total Pages : 146 pages
Book Rating : 4.F/5 ( download)
Download or read book Aircraft Drag Reduction Through Extended Formation Flight written by Simeon Andrew Ning and published by Stanford University. This book was released on 2011 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Jan Roskam
Publisher :
ISBN 13 :
Total Pages : 468 pages
Book Rating : 4.:/5 (31 download)
Download or read book Proceedings of the NASA·Industry·University General Aviation Drag Reduction Workshop written by Jan Roskam and published by . This book was released on 1984 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jerry N. Hefner
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Concepts for Aircraft Drag Reduction written by Jerry N. Hefner and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Design and Analysis Approach for Drag Reduction on Aircraft with Adaptive Lifting Surfaces written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Adaptive lifting surfaces, which can be tailored for different flight conditions, have been shown to be beneficial for drag reduction when compared with conventional non-adaptive surfaces. Applying multiple trailing-edge flaps along the wing span allows for the redistribution of lift to suit different flight conditions. The current approach uses the trailing-edge flap distribution to reduce both induced- and profile- components of drag with a trim constraint. Induced drag is reduced by optimally redistributing the lift between the lifting surfaces and along the span of each surface. Profile drag is reduced through the use of natural laminar flow airfoils, which maintain distinct low-drag-ranges (drag buckets) surrounding design lift values. The low-drag-ranges can be extended to include off-design values through small flap deflections, similar to cruise flaps. Trim is constrained for a given static margin by considering longitudinal pitching moment contributions from changes in airfoil section due to individual flap deflections, and from the redistribution of fore-and-aft lift due to combination of flap deflections. The approach uses the concept of basic and additional lift to linearlize the problem, which allows for standard constrained-minimization theory to be employed for determining optimal flap-angle solutions. The resulting expressions for optimal flap-angle solutions are presented as simple matrix equations. This work presents a design and analysis approach which is used to produce flap-angle solutions that independently reduce induced, profile, and total drag. Total drag is defined to be the sum of the induced- and profile-components of drag. The general drag reduction approach is adapted for each specific situation to develop specific drag reduction schemes that are applied to single- and multiple-surface configurations. Successful results show that, for the application of the induced drag reduction schemes on a tailless aircraft, near-elliptical lift dist.
Author : Xinguo Zhang
Publisher : Springer
ISBN 13 : 981133305X
Total Pages : 3068 pages
Book Rating : 4.8/5 (113 download)
Download or read book The Proceedings of the 2018 Asia-Pacific International Symposium on Aerospace Technology (APISAT 2018) written by Xinguo Zhang and published by Springer. This book was released on 2019-06-08 with total page 3068 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a compilation of peer-reviewed papers from the 2018 Asia-Pacific International Symposium on Aerospace Technology (APISAT 2018). The symposium is a common endeavour between the four national aerospace societies in China, Australia, Korea and Japan, namely, the Chinese Society of Aeronautics and Astronautics (CSAA), Royal Aeronautical Society Australian Division (RAeS Australian Division), the Korean Society for Aeronautical and Space Sciences (KSAS) and the Japan Society for Aeronautical and Space Sciences (JSASS). APISAT is an annual event initiated in 2009 to provide an opportunity for researchers and engineers from Asia-Pacific countries to discuss current and future advanced topics in aeronautical and space engineering.
Author : John Kester Onyebuchi Momoh
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (112 download)
Download or read book An Experimental and Theoretical Investigation of Novel Aircraft Drag Reduction written by John Kester Onyebuchi Momoh and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Donald E. Gault
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (31 download)
Download or read book An Experimental Investigation of Boundary-layer Control for Drag Reduction of a Swept-wing Section at Low Speed and High Reynolds Numbers written by Donald E. Gault and published by . This book was released on 1960 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aircraft Drag Prediction and Reduction written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. National Advisory Committee for Aeronautics
Publisher :
ISBN 13 :
Total Pages : 256 pages
Book Rating : 4.:/5 (89 download)
Download or read book NACA-Industry Conference on Personal-Aircraft Research written by United States. National Advisory Committee for Aeronautics and published by . This book was released on 1946 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. W.. Slooff
Publisher :
ISBN 13 : 9789283515241
Total Pages : 4 pages
Book Rating : 4.5/5 (152 download)
Download or read book Aircraft Drag Prediction and Reduction written by J. W.. Slooff and published by . This book was released on 1986 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : C. Sinclair Wells
Publisher : Springer
ISBN 13 : 1489955798
Total Pages : 497 pages
Book Rating : 4.4/5 (899 download)
Download or read book Viscous Drag Reduction written by C. Sinclair Wells and published by Springer. This book was released on 2013-12-20 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. S. W. Thomas
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (228 download)
Download or read book Aircraft Drag Reduction Technology written by A. S. W. Thomas and published by . This book was released on 1984 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book An Investigation of the Feasibility of Active Boundary Layer Thickening for Aircraft Drag Reduction written by and published by . This book was released on 198? with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (946 download)
Download or read book Drag Reduction from Formation Flight. Flying Aircraft in Bird-Like Formations Could Significantly Increase Range written by and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Air Vehicles Directorate is currently studying a novel form of formation flight. For centuries, flocks of migratory birds have flown in large formations. One reason for this is the drag reduction that is obtained by flying in close proximity to wakes generated by other birds. Photographic studies of Canadian Geese indicate the average spacing between adjacent birds is very close to the optimum predicted by simple aerodynamic theory. Small heart monitors implanted in White Pelicans show reduced heart rates while flying in formation compared to individual flight. Recent advances in automatic control theory combined with the ability to accurately determine the location of aircraft may now make this practical for aircraft. Aircraft wings generate strong tip vortices (like horizontal tornadoes) that generate large downward velocities ('downwash') between the wing tips and upward velocities ('upwash') outboard of the tips. For some aircraft, the velocities at the edge of these vortices can exceed 100 miles per hour. By properly positioning the wing of another aircraft within this upwash, the effective velocity vector of the aircraft is rotated downward. This rotates the lift vector forward and the drag vector upward, giving the impression of flying downhill. The net effect is a decrease in drag as measured with respect to the flight path. The phenomenon is not 'drafting', which bicycle and automobile racers use to reduce wind resistance. The upper limit on the theoretical benefit in range increases with the square root of the number of aircraft in the formation. For example, the range of nine aircraft in formation would by three times the range of a single aircraft. Introducing only a single constraint, that the formation cruises at the same altitude that single aircraft currently use, reduces the benefit for a nine aircraft formation to an 80% increase. Other considerations like engine performance and atmospheric turbulence reduce the value even further.
