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Investigation Of Drag Reduction By Boundarylayer Suction On A 50 Degree Swept Tapered Wing At M Free Stream Equals 25 To 4
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Book Synopsis Investigation of Drag Reduction by Boundarylayer Suction on a 50-degree Swept Tapered Wing at M (free-stream) Equals 2.5 to 4 by : S. R. Pate
Download or read book Investigation of Drag Reduction by Boundarylayer Suction on a 50-degree Swept Tapered Wing at M (free-stream) Equals 2.5 to 4 written by S. R. Pate and published by . This book was released on 1964 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests were conducted in the 40-in. supersonic Tunnel A of the von Karman Gas Dynamics Facility to determine the effectiveness of boundarylayer suction for laminar flow control on a tapered, three-dimensional, 50-deg swept supersonic wing. Test Mach numbers were 2.5, 3, 3.5, and 4 with a Reynolds number range (based on boundary-layer rake location) from 4.3 to 19.5 million for angles of attack of zero and =3 deg. Wake drag, suction drag, and total drag coefficients and the corresponding suction coefficients are presented, along with fully turbulent wake drag coefficients for the no-suction case.
Book Synopsis INVESTIGATION OF DRAG REDUCTION BY BOUNDARY-LAYER SUCTION ON A 36-DEG SWEPT WING AT M by :
Download or read book INVESTIGATION OF DRAG REDUCTION BY BOUNDARY-LAYER SUCTION ON A 36-DEG SWEPT WING AT M written by and published by . This book was released on 1963 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Drag Reduction by Boundary Layer Suction on a 72.5-deg Swept Wind at M 2 and 2.25 by : S. R. Pate
Download or read book Investigation of Drag Reduction by Boundary Layer Suction on a 72.5-deg Swept Wind at M 2 and 2.25 written by S. R. Pate and published by . This book was released on 1963 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests were conducted in the 40-Inch Supersonic Tunnel (A) of the von Karman Gas Dynamics Facility to determine the effectiveness of boundary layer suction for laminar flow control on a two-dimensional, 72.5-deg swept wing having a subsonic leading edge. Test Mach numbers were 2 and 2.25 with a Reynolds number range based on wing chord from 3 to 14 million for angles of attack of 0.15, 0.45, and 0.75 deg. With suction, full chord laminar flow was maintained at M 2, alpha 0.15, 0.45, and 0.75 deg up to a length Reynolds number of approximately 9 million. At M 2.25 and alpha 0.15 deg, full chord lam inar flow was maintained up to a Reynolds number of 6.5 x 10 to the 6th power and for alpha 0.45 and 0.75 deg, up to a Reynolds number of 3 x 10 to the 6th power. Selected data are presented.
Book Synopsis Investigation of Drag Reduction by Boundarylayer Suction on a Body of Revolution at Mach Numbers 2.5, 3, and 3.5 by :
Download or read book Investigation of Drag Reduction by Boundarylayer Suction on a Body of Revolution at Mach Numbers 2.5, 3, and 3.5 written by and published by . This book was released on 1965 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests were conducted in the 40-in. supersonic tunnel of the von Karman Gas Dynamics Facility to determine the effectiveness of boundary-layer suction for laminar flow control on a 9.2-in.diam body of revolution at Mach 2. 5, 3, and 3.5 with a Reynolds number range (based on boundarylayer rake location) from 9.9 to 51.7 million for angles of attack from 0 to =2 deg. The condition of the boundary layer was very sensitive to changes in angle of attack. Increasing the Reynolds number also decreased the maximum angle of attack. Wake, suction, and total drag coefficients and the corresponding suction coefficients are presented, along with some fully turbulent wake drag coefficients for the no suction case.
Book Synopsis Theoretical Investigation of Drag Reduction in Maintaining the Laminar Boundary Layer by Suction by : A. Ulrich
Download or read book Theoretical Investigation of Drag Reduction in Maintaining the Laminar Boundary Layer by Suction written by A. Ulrich and published by . This book was released on 1947 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maintenance of a laminar boundary layer by suction was suggested recently to decrease the friction drag of an immersed body, in particular an airfoil section [1]. The present treatise makes a theoretical contribution to this question in which, for several cases of suction and blowing, the stability of the laminar velocity profile is investigated. Estimates of the minimum suction quantities for maintaining the laminar boundary layer and estimates of drag reduction are thereby obtained.
Author :National Aeronautics and Space Administration Publisher :CreateSpace ISBN 13 :9781493794324 Total Pages :86 pages Book Rating :4.7/5 (943 download)
Book Synopsis A History of Suction-Type Laminar-Flow Control with Emphasis on Flight Research by : National Aeronautics and Space Administration
Download or read book A History of Suction-Type Laminar-Flow Control with Emphasis on Flight Research written by National Aeronautics and Space Administration and published by CreateSpace. This book was released on 2013-11 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laminar-flow control is an area of aeronautical research that has a long history at NASA's Langley Research Center, Dryden Flight Research Center, their predecessor organizations, and elsewhere. In this monograph, Albert L. Braslow, who spent much of his career at Langley working with this research, presents a history of that portion of laminar-flow technology known as active laminar-flow control, which employs suction of a small quantity of air through airplane surfaces. This important technique offers the potential for significant reduction in drag and, thereby, for large increases in range or reductions in fuel usage for aircraft. For transport aircraft, the reductions in fuel consumed as a result of laminar-flow control may equal 30 percent of present consumption. Given such potential, it is obvious that active laminar-flow control with suction is an important technology. In this study, the author covers the early history of the subject and brings the story all the way to the mid-1990s with an emphasis on flight research, much of which occurred at Dryden.
Book Synopsis Drag Reduction by Suction of the Boundary Layer Separated Behind Shock Wave Formation at High Mach Numbers by : B. Regenscheit
Download or read book Drag Reduction by Suction of the Boundary Layer Separated Behind Shock Wave Formation at High Mach Numbers written by B. Regenscheit and published by . This book was released on 1947 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: With an approach of the velocity of flight of a ship to the velocity of sound, there occurs a considerable increase of the drag. The reason for this must be found in the boundary layer separation caused by formation of shock waves. It will be endeavored to reduce the drag increase by suction of the boundary layer. Experimental results showed that drag increase may be considerably reduced by this method. It was, also, observed that, by suction, the position of shock waves can be altered to a considerable extent.
Book Synopsis Boundary Layer and Flow Control by : Gustav Victor Lachmann
Download or read book Boundary Layer and Flow Control written by Gustav Victor Lachmann and published by Pergamon. This book was released on 1961 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerodynamic Drag Reduction Technologies by : Peter Thiede
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.
Book Synopsis Natural Laminar Flow and Laminar Flow Control by : R.W. Barnwell
Download or read book Natural Laminar Flow and Laminar Flow Control written by R.W. Barnwell and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research 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.
Book Synopsis Viscous Drag Reduction by : C. Sinclair Wells
Download or read book Viscous Drag Reduction written by C. Sinclair Wells and published by . This book was released on 2014-09-01 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aircraft Excrescence Drag by : Alec David Young
Download or read book Aircraft Excrescence Drag written by Alec David Young and published by . This book was released on 1981 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Drag Reduction for External and Internal Boundary Layers Using Riblets and Polymers by : Laurel W. Reidy
Download or read book Drag Reduction for External and Internal Boundary Layers Using Riblets and Polymers written by Laurel W. Reidy and published by . This book was released on 1988 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two hydrodynamic experiments were conducted to measure drag reduction using riblets in turbulent boundary layers. The first was an external boundary layer experiment using a flat plate in a water tunnel, and the second was an internal boundary layer experiment using a 6-inch diameter pipe. Both experiments used adhesive-backed, vinyl, riblet film, manufactured by the 3M Co., with height and spacing of the symmetric v-grooves equal to 0.003 in. For the flat plate test, free stream velocities ranged from 6.5 ft/sec to 20 ft/sec, and Re sub theta ranged from 1260-7040. The results are in good agreement with aerodynamic data, and show a maximum drag reduction of 8.1% + or - 2.5% at s(+) = 13.1. Much larger percentages of friction reduction (approx. 3x as much) were measured with riblets in the pipe. When a drag-reducing polymer solution was used in conjunction with the riblets in the pipe flow, the total drag reduction was approximately equal to the sum of the drag reductions of the two techniques used separately, with some dependence on Reynolds number. Before these pipe flow results can be extended to general situations, further experiments are needed to investigate the boundary layer transition from smooth to riblet surface.
Book Synopsis Beyond Tube-and-Wing by : Bruce Larrimer
Download or read book Beyond Tube-and-Wing written by Bruce Larrimer and published by . This book was released on 2020-06-15 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Viscous Drag Reduction by : C. Sinclair Wells
Download or read book Viscous Drag Reduction written by C. Sinclair Wells and published by . This book was released on 1969 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Viscous Drag Reduction: Proceedings of the Symposium... Held at the Ltv Research Center, Dallas, Texas, September 24 and 25, 1968 by : dallas Symposium on viscous drag reduction (1968.w)
Download or read book Viscous Drag Reduction: Proceedings of the Symposium... Held at the Ltv Research Center, Dallas, Texas, September 24 and 25, 1968 written by dallas Symposium on viscous drag reduction (1968.w) and published by . This book was released on 1969 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Drag Reduction Due to Boundary-Layer Control by Combined Blowing and Suction by :
Download or read book Drag Reduction Due to Boundary-Layer Control by Combined Blowing and Suction written by and published by . This book was released on 1984 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A boundary system of combined blowing and suction is investigated. Blowing is applied in the front part of the body where the pressure gradient is favourable, whereas suction is applied in the rear part of the body where adverse pressure gradients exist. In order to avoid the 'sink drag' the volume rate of suction should be equal or smaller than the blowing volume rate. Theoretical investigations of laminar flows include optimization of the blowing velocity distribution as well as second-order boundary layer effects such as pressure drag and displacement effects on friction drag. Experimental results (mean velocities and shear stresses) of turbulent boundary layers with very strong blowing velocities near the stagnation point of a circular cylinder are used as a basis of a simple prediction method. Experiments on a circular cylinder show considerable drag reductions due to the combined blowing and suction boundary layer control systems.
