Download or read book Issues Relating to Laminar Flow Control on the Leading edge of Swept Wings written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Boundary Layer and Flow Control written by G. V. Lachmann and published by Elsevier. This book was released on 2014-05-12 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boundary Layer and Flow Control: Its Principles and Application, Volume 2 focuses on the layer of fluid in the immediate area of a bounding surface where the effects of viscosity are substantial. This book is organized into two main topics—boundary layer control for low drag, and shock-induced separation and its prevention by design and boundary layer control. It specifically discusses the nature of transition, effect of two-dimensional and isolated roughness on laminar flow, and progress in the design of low drag aerofoils. The onset of separation effects for aerofoils and wings, shock-induced separation for laminar boundary layers, and shock-induced separation for laminar boundary layers are also deliberated. This volume is recommended to physicists and specialists interested in boundary layer and flow control.
Download or read book Computations of Laminar Flow Control on Swept Wings as a Companion to Flight Test Research written by Richard G. Rhodes and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The high cost of energy has resulted in a renewed interest in the study of reducing skin-friction drag in aeronautical applications. Laminar Flow Control (LFC) refers to any technique which alters the basic-state flow-field to delay transition from laminar to turbulent flow. Achieving fully laminar flow over a civilian transport wing will significantly reduce drag and fuel costs while increasing range and performance. Boundary-layer suction has proven to be an effective means of achieving laminar flow over an aircraft wing as demonstrated with the Northrop X-21 program; however, even with the savings in fuel, the high manufacturing and maintenance costs have discouraged the use of this technology. Recent work using threedimensional (3-D) spanwise-periodic distributed roughness elements (DREs) has shown great promise as a means of controlling the crossflow instability responsible for transition over a swept wing without the need for a complex suction system. The Texas A.
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 Separation Ahead of Controls on Swept Wings written by Kaufman Louis G. (II) and published by . This book was released on 1975 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock-induced flow-separation ahead of trailing edge controls on swept wings is investigated with emphasis on the effects of boundary layer transition on the location and shape of the separation line. Experimental results were obtained by using forward facing steps mounted on swept-leading-edge flat-plate wing models in the ARL Mach 6 Tunnel for model running length Reynolds numbers varying from 0.9 to 33 million. The data support qualitatively a proposed, strip-type method for estimating, the extent and shape of the three dimensional region of separated flow ahead of controls on swept wings. (Author).
Download or read book Feasibility and Benefits of Laminar Flow Control on Supersonic Cruise Airplanes written by and published by . This book was released on 1989 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Sweep Angle on the Boundary layer Stability Characteristics of an Untapered Wing at Low Speeds written by Frederick W. Boltz and published by . This book was released on 1960 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flow Control Over Sharp edged Wings written by Jose Rullan and published by . This book was released on 2007 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wings swept by 30 to 40 degrees with sharp leading edges are today very common on flghter aircraft. There is very little work devoted to the understanding of the aerodynamics of such wings. The problem is that such wings may be able to sustain attached flow, even if their tip vortices are broken down, or stall like two-dimensional wings. The aerodynamics of such wings were studied and investigated experimentally. Pressure distributions and velocity fields were obtained in a wind tunnel and a water tunnel. The effectiveness of leading-edge control of the flow over such wings was explored. Oscillating mini-flaps and pulsed jets along the leading edge were employed. The results indicate that two-D-like vortices are periodically generated and shed. It was also discovered that an underline feature of the flow, a streamwise vortex is periodically activated, penetrating the separated flow, eventually emerging downstream of the trailing edge of the wing. The results indicate that significant increases in tilt can be achieved in the average, by managing the development of streamwise and spanwise vortices. The technique is effective in the range of angles of attack of 10 to 20 degrees, for which the uncontrolled flow is stalled.
Download or read book Summary of Laminar Flow Control Techniques for Aircraft written by Philip P. Antonatos and published by . This book was released on 1964 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Laminar Flow Control Systems Concepts for Subsonic Commercial Transport Aircraft written by and published by . This book was released on 1983 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Laminar Flow Control System Concepts for Subsonic Commercial Transport Aircraft written by and published by . This book was released on 1979 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Some Fluid Mechanical Problems Related to Subsonic and Supersonic Aircraft written by United States. National Aeronautics and Space Administration. Ad Hoc Committee on Subsonic and Supersonic Aeronautics and published by . This book was released on 1968 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1992 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A History of Suction type Laminar flow Control with Empahsis i e Emphasis on Flight Research written by Albert L. Braslow and published by . This book was released on 1999 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronautical Technologies for the Twenty First Century written by National Research Council and published by National Academies Press. This book was released on 1992-02-01 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: Prepared at the request of NASA, Aeronautical Technologies for the Twenty-First Century presents steps to help prevent the erosion of U.S. dominance in the global aeronautics market. The book recommends the immediate expansion of research on advanced aircraft that travel at subsonic speeds and research on designs that will meet expected future demands for supersonic and short-haul aircraft, including helicopters, commuter aircraft, "tiltrotor," and other advanced vehicle designs. These recommendations are intended to address the needs of improved aircraft performance, greater capacity to handle passengers and cargo, lower cost and increased convenience of air travel, greater aircraft and air traffic management system safety, and reduced environmental impacts.
