Áircraft Drag Reduction Through Laminar Flow Control
Author: D.L. Balageas
Publisher:
Published: 1990
Total Pages:
ISBN-13:
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Author: D.L. Balageas
Publisher:
Published: 1990
Total Pages:
ISBN-13:
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Publisher: AIAA
Published: 1990
Total Pages: 542
ISBN-13: 9781600863783
DOWNLOAD EBOOKAuthor: R.W. Barnwell
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 415
ISBN-13: 1461228727
DOWNLOAD EBOOKResearch on laminar flow and its transition to turbulent flow has been an important part of fluid dynamics research during the last sixty years. Since transition impacts, in some way, every aspect of aircraft performance, this emphasis is not only understandable but should continue well into the future. The delay of transition through the use of a favorable pressure gradient by proper body shaping (natural laminar flow) or the use of a small amount of suction (laminar flow control) was recognized even in the early 1930s and rapidly became the foundation of much of the laminar flow research in the U.S. and abroad. As one would expect, there have been many approaches, both theoretical and experimental, employed to achieve the substantial progress made to date. Boundary layer stability theories have been formu lated and calibrated by a good deal of wind tunnel and flight experiments. New laminar now airfoils and wings have been designed and many have been employed in aircraft designs. While the early research was, of necessity, concerned with the design of subsonic aircraft interest has steadily moved to higher speeds including those appropriate to planetary entry. Clearly, there have been substantial advances in our understanding of transition physics and in the development and application of transition prediction methodolo gies to the design of aircraft.
Author: Albert L. Braslow
Publisher:
Published: 1999
Total Pages: 94
ISBN-13:
DOWNLOAD EBOOKAuthor: Peter Thiede
Publisher: Springer Science & Business Media
Published: 2013-06-29
Total Pages: 382
ISBN-13: 3540453598
DOWNLOAD EBOOK------------------------------------------------------------ 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: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
Published: 2018-10-26
Total Pages: 54
ISBN-13: 9781729302408
DOWNLOAD EBOOKReduction of drag has been a major goal of the aircraft industry as no other single quantity influences the operating costs of transport aircraft more than aerodynamic drag. It has been estimated that even modest reduction of frictional drag could reduce fuel costs by anywhere from 2 to 5 percent. Current research on boundary layer drag reduction deals with various approaches to reduce turbulent skin friction drag as a means of improving aircraft performance. One of the techniques belonging to this category is laminar flow control in which extensive regions of laminar flow are maintained over aircraft surfaces by delaying transition to turbulence through the ingestion of boundary layer air. While problems of laminar flow control have been studied in some detail, the prospect of improving the propulsion system of an aircraft by the use of ingested boundary layer air has received very little attention. An initial study for the purpose of reducing propulsion system requirements by utilizing the kinetic energy of boundary layer air was performed in the mid-1970's at LeRC. This study which was based on ingesting the boundary layer air at a single location, did not yield any significant overall propulsion benefits; therefore, the concept was not pursued further. However, since then it has been proposed that if the boundary layer air were ingested at various locations on the aircraft surface instead of just at one site, an improvement in the propulsion system might be realized. The present report provides a review of laminar flow control by suction and focuses on the problems of reducing skin friction drag by maintaining extensive regions of laminar flow over the aircraft surfaces. In addition, it includes an evaluation of an aircraft propulsion system that is augmented by ingested boundary layer air. Keith, Theo G., Jr. and Dewitt, Kenneth J. Unspecified Center
Author: Bruce H. Carmichael
Publisher:
Published: 2000
Total Pages: 230
ISBN-13:
DOWNLOAD EBOOKAuthor: Peter Thiede
Publisher: Springer Science & Business Media
Published: 2001-05-22
Total Pages: 416
ISBN-13: 9783540419112
DOWNLOAD EBOOKThis volume contains the proceedings of the CEAS/DragNet European Drag Reduction Conference 2000. 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 is of particular interest to engineers, scientists and students working in the aeronautics industry, research establishments or academia.
Author: Philip P. Antonatos
Publisher:
Published: 1964
Total Pages: 44
ISBN-13:
DOWNLOAD EBOOKAuthor: Ning Qin
Publisher: Springer Nature
Published: 2019-10-17
Total Pages: 341
ISBN-13: 3030296881
DOWNLOAD EBOOKThis book presents the results of a European-Chinese collaborative research project, Manipulation of Reynolds Stress for Separation Control and Drag Reduction (MARS), including an analysis and discussion of the effects of a number of active flow control devices on the discrete dynamic components of the turbulent shear layers and Reynolds stress. From an application point of view, it provides a positive and necessary step to control individual structures that are larger in scale and lower in frequency compared to the richness of the temporal and spatial scales in turbulent separated flows.