Author: R. R. LanderyouPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 26
Book Description
Further tests of a laminar flow swept wing with boundary layer control by suction
Author: R. R. LanderyouPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 26
Book Description
Flight Tests of a Laminar Flow Swept Wing with Boundary Layer Control by Suction
Author: R. R. LanderyouPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 21
Book Description
Natural Laminar Flow and Laminar Flow Control
Author: R.W. BarnwellPublisher: Springer Science & Business Media
ISBN: 1461228727
Category : Science
Languages : en
Pages : 415
Book Description
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.
Computations of Laminar Flow Control on Swept Wings as a Companion to Flight Test Research
Author: Richard G. RhodesPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
A History of Suction-type Laminar-flow Control with Empahsis [i.e. Emphasis] on Flight Research
![A History of Suction-type Laminar-flow Control with Empahsis [i.e. Emphasis] on Flight Research PDF](https://books.google.com/books/content/images/frontcover/bMd6SBzgH9kC?fife=w80-h100)
Author: Albert L. BraslowPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 90
Book Description
The NASA Langley Laminar-Flow-Control (Lfc) Experiment on a Swept, Supercritical Airfoil
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781723447419
Category :
Languages : en
Pages : 126
Book Description
A large-chord, swept, supercritical, laminar-flow-control (LFC) airfoil was designed and constructed and is currently undergoing tests in the Langley 8 ft Transonic Pressure Tunnel. The experiment was directed toward evaluating the compatibility of LFC and supercritical airfoils, validating prediction techniques, and generating a data base for future transport airfoil design as part of NASA's ongoing research program to significantly reduce drag and increase aircraft efficiency. Unique features of the airfoil included a high design Mach number with shock free flow and boundary layer control by suction. Special requirements for the experiment included modifications to the wind tunnel to achieve the necessary flow quality and contouring of the test section walls to simulate free air flow about a swept model at transonic speeds. Design of the airfoil with a slotted suction surface, the suction system, and modifications to the tunnel to meet test requirements are discussed. Harris, Charles D. and Harvey, William D. and Brooks, Cuyler W., Jr. Langley Research Center BOUNDARY LAYER CONTROL; LAMINAR BOUNDARY LAYER; LAMINAR FLOW; SUPERCRITICAL AIRFOILS; SWEPT WINGS; AIRCRAFT DESIGN; DRAG REDUCTION; FREE FLOW; GENERAL OVERVIEWS; PREDICTION ANALYSIS TECHNIQUES; SUCTION; TRANSONIC SPEED; WIND TUNNEL TESTS; WIND TUNNEL WALLS; WING SLOTS...
A History of Suction-Type Laminar-Flow Control with Emphasis on Flight Research
Author: National Aeronautics and Space AdministrationPublisher: CreateSpace
ISBN: 9781493794324
Category : History
Languages : en
Pages : 86
Book Description
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.
Author: Frederick W. Boltz
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