Control Of Unsteady Separated Flow Associated With The Dynamic Stall Of Airfoils

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Control of Unsteady Separated Flow Associated with the Dynamic Stall of Airfoils

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Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722129781
Total Pages : 42 pages
Book Rating : 4.1/5 (297 download)

Book Synopsis Control of Unsteady Separated Flow Associated with the Dynamic Stall of Airfoils by : National Aeronautics and Space Administration (NASA)

Download or read book Control of Unsteady Separated Flow Associated with the Dynamic Stall of Airfoils written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-30 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: An effort to understand and control the unsteady separated flow associated with the dynamic stall of airfoils was funded for three years through the NASA cooperative agreement program. As part of this effort a substantial data base was compiled detailing the effects various parameters have on the development of the dynamic stall flow field. Parameters studied include Mach number, pitch rate, and pitch history, as well as Reynolds number (through two different model chord lengths) and the condition of the boundary layer at the leading edge of the airfoil (through application of surface roughness). It was found for free stream Mach numbers as low as 0.4 that a region of supersonic flow forms on the leading edge of the suction surface of the airfoil at moderate angles of attack. The shocks which form in this supersonic region induce boundary-layer separation and advance the dynamic stall process. Under such conditions a supercritical airfoil profile is called for to produce a flow field having a weaker leading-edge pressure gradient and no leading-edge shocks. An airfoil having an adaptive-geometry, or dynamically deformable leading edge (DDLE), is under development as a unique active flow-control device. The DDLE, formed of carbon-fiber composite and fiberglass, can be flexed between a NACA 0012 profile and a supercritical profile in a controllable fashion while the airfoil is executing an angle-of-attack pitch-up maneuver. The dynamic stall data were recorded using point diffraction interferometry (PDI), a noninvasive measurement technique. A new high-speed cinematography system was developed for recording interferometric images. The system is capable of phase-locking with the pitching airfoil motion for real-time documentation of the development of the dynamic stall flow field. Computer-aided image analysis algorithms were developed for fast and accurate reduction of the images, improving interpretation of the results. Wilder, M. C. Unspecified Center NCC2-637...

Control of Unsteady Separated Flow Associated with the Dynamic Pitching of Airfoils

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Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722323097
Total Pages : 88 pages
Book Rating : 4.3/5 (23 download)

Book Synopsis Control of Unsteady Separated Flow Associated with the Dynamic Pitching of Airfoils by : National Aeronautics and Space Administration (NASA)

Download or read book Control of Unsteady Separated Flow Associated with the Dynamic Pitching of Airfoils written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although studies have been done to understand the dependence of parameters for the occurrence of deep stall, studies to control the flow for sustaining lift for a longer time has been little. To sustain the lift for a longer time, an understanding of the development of the flow over the airfoil is essential. Studies at high speed are required to study how the flow behavior is dictated by the effects of compressibility. When the airfoil is pitched up in ramp motion or during the upstroke of an oscillatory cycle, the flow development on the upper surface of the airfoil and the formation of the vortex dictates the increase in lift behavior. Vortex shedding past the training edge decreases the lift. It is not clear what is the mechanism associated with the unsteady separation and vortex formation in present unsteady environment. To develop any flow control device, to suppress the vortex formation or delay separation, it is important that this mechanism be properly understood. The research activities directed toward understanding these questions are presented and the results are summarized. Ahmed, Sajeer Unspecified Center...

Scientific and Technical Aerospace Reports

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Publisher :
ISBN 13 :
Total Pages : 548 pages
Book Rating : 4.X/5 (4 download)

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Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Scientific and Technical Aerospace Reports

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Author :
Publisher :
ISBN 13 :
Total Pages : 456 pages
Book Rating : 4.E/5 ( download)

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Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Aeronautical Engineering: A Cumulative Index to a Continuing Bibliography (supplement 325)

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Author :
Publisher :
ISBN 13 :
Total Pages : 470 pages
Book Rating : 4.:/5 (317 download)

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Download or read book Aeronautical Engineering: A Cumulative Index to a Continuing Bibliography (supplement 325) written by and published by . This book was released on 1995 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Active Flow Control II

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Author : Rudibert King
Publisher : Springer Science & Business Media
ISBN 13 : 364211735X
Total Pages : 417 pages
Book Rating : 4.6/5 (421 download)

Book Synopsis Active Flow Control II by : Rudibert King

Download or read book Active Flow Control II written by Rudibert King and published by Springer Science & Business Media. This book was released on 2010-04-06 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interest in the field of active flow control (AFC) is steadily increasing. In - cent years the number of conferences and special sessions devoted to AFC org- ized by various institutions around the world continuously rises. New advanced courses for AFC are offered by the American Institute of Aeronautics and Ast- nautics (AIAA), the European Research Community on Flow, Turbulence and Combustion (ERCOFTAC), the International Centre for Mechanical Sciences (CISM), the von Karman Institute for Fluid Dynamics (VKI), to name just a few. New books on AFC are published by prominent colleagues of our field and even a new periodical, the ‘International Journal of Flow Control’, appeared. Despite these many activities in AFC it was felt that a follow-up of the highly successful ‘ACTIVE FLOW CONTROL’ Conference held in Berlin in 2006 was appropriate. As in 2006, ‘ACTIVE FLOW CONTROL II’ consisted only of invited lectures. To sti- late multidisciplinary discussions between experimental, theoretical and numerical fluid dynamics, aerodynamics, turbomachinary, mathematics, control engineering, metrology and computer science parallel sessions were excluded. Unfortunately, not all of the presented papers made it into this volume. As the preparation and printing of a book takes time and as this volume should be available at the conf- ence, the Local Organizing Committee had to set up a very ambitious time sch- ule which could not be met by all contributors.

35th Aerospace Sciences Meeting & Exhibit

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ISBN 13 :
Total Pages : 636 pages
Book Rating : 4.0/5 ( download)

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Download or read book 35th Aerospace Sciences Meeting & Exhibit written by and published by . This book was released on 1997 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Aeronautical Engineering

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ISBN 13 :
Total Pages : 538 pages
Book Rating : 4.3/5 (91 download)

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Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Experimental Heat Transfer, Fluid Mechanics and Thermodynamics 1993

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Author : M.D. Kelleher
Publisher : Elsevier
ISBN 13 : 044459860X
Total Pages : 1002 pages
Book Rating : 4.4/5 (445 download)

Book Synopsis Experimental Heat Transfer, Fluid Mechanics and Thermodynamics 1993 by : M.D. Kelleher

Download or read book Experimental Heat Transfer, Fluid Mechanics and Thermodynamics 1993 written by M.D. Kelleher and published by Elsevier. This book was released on 2012-12-02 with total page 1002 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers contained in this volume reflect the ingenuity and originality of experimental work in the areas of fluid mechanics, heat transfer and thermodynamics. The contributors are drawn from 27 countries which indicates how well the worldwide scientific community is networked. The papers cover a broad spectrum from the experimental investigation of complex fundamental physical phenomena to the study of practical devices and applications. A uniform outline and method of presentation has been used for each paper.

Principles of Helicopter Aerodynamics

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Author : J. Gordon Leishman
Publisher : Cambridge University Press
ISBN 13 : 9780521523967
Total Pages : 544 pages
Book Rating : 4.5/5 (239 download)

Book Synopsis Principles of Helicopter Aerodynamics by : J. Gordon Leishman

Download or read book Principles of Helicopter Aerodynamics written by J. Gordon Leishman and published by Cambridge University Press. This book was released on 2002-12-23 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Helicopters are highly capable and useful rotating-wing aircraft with roles that encompass a variety of civilian and military applications. Their usefulness lies in their unique ability to take off and land vertically, to hover stationary relative to the ground, and to fly forward, backward, or sideways. These unique flying qualities, however, come at a high cost including complex aerodynamic problems, significant vibrations, high levels of noise, and relatively large power requirements compared to fixed-wing aircraft. This book, written by an internationally recognized expert, provides a thorough, modern treatment of the aerodynamic principles of helicopters and other rotating-wing vertical lift aircraft. Every chapter is extensively illustrated and concludes with a bibliography and homework problems. Advanced undergraduate and graduate students, practising engineers, and researchers will welcome this thorough and up-to-date text on rotating-wing aerodynamics.

Low-Speed Wind Tunnel Testing

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Author : Jewel B. Barlow
Publisher : John Wiley & Sons
ISBN 13 : 0471557749
Total Pages : 738 pages
Book Rating : 4.4/5 (715 download)

Book Synopsis Low-Speed Wind Tunnel Testing by : Jewel B. Barlow

Download or read book Low-Speed Wind Tunnel Testing written by Jewel B. Barlow and published by John Wiley & Sons. This book was released on 1999-02-22 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt: A brand-new edition of the classic guide on low-speed wind tunnel testing While great advances in theoretical and computational methods have been made in recent years, low-speed wind tunnel testing remains essential for obtaining the full range of data needed to guide detailed design decisions for many practical engineering problems. This long-awaited Third Edition of William H. Rae, Jr.'s landmark reference brings together essential information on all aspects of low-speed wind tunnel design, analysis, testing, and instrumentation in one easy-to-use resource. Written by authors who are among the most respected wind tunnel engineers in the world, this edition has been updated to address current topics and applications, and includes coverage of digital electronics, new instrumentation, video and photographic methods, pressure-sensitive paint, and liquid crystal-based measurement methods. The book is organized for quick access to topics of interest, and examines basic test techniques and objectives of modeling and testing aircraft designs in low-speed wind tunnels, as well as applications to fluid motion analysis, automobiles, marine vessels, buildings, bridges, and other structures subject to wind loading. Supplemented with real-world examples throughout, Low-Speed Wind Tunnel Testing, Third Edition is an indispensable resource for aerospace engineering students and professionals, engineers and researchers in the automotive industries, wind tunnel designers, architects, and others who need to get the most from low-speed wind tunnel technology and experiments in their work.

Flow Control Techniques and Applications

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Author : Jinjun Wang
Publisher : Cambridge University Press
ISBN 13 : 1107161568
Total Pages : 293 pages
Book Rating : 4.1/5 (71 download)

Book Synopsis Flow Control Techniques and Applications by : Jinjun Wang

Download or read book Flow Control Techniques and Applications written by Jinjun Wang and published by Cambridge University Press. This book was released on 2019 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master the theory, applications and control mechanisms of flow control techniques.

Advances of Science and Technology

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Author : Fasikaw Atanaw Zimale
Publisher : Springer
ISBN 13 : 3030153576
Total Pages : 625 pages
Book Rating : 4.0/5 (31 download)

Book Synopsis Advances of Science and Technology by : Fasikaw Atanaw Zimale

Download or read book Advances of Science and Technology written by Fasikaw Atanaw Zimale and published by Springer. This book was released on 2019-03-07 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed post-conference proceedings of the 6th International Conference on Advancement of Science and Technology, ICAST 2018, which took place in Bahir Dar, Ethiopia, in October 2018. The 47 revised full papers were carefully reviewed and selected from 71 submissions. The papers present economic and technologic developments in modern societies in five tracks: agro-processing industries for sustainable development, water resources development for the shared vision in blue Nile basin, IT and computer technology innovation, recent advances in electrical and computer engineering, progresses in product design and system optimization.

Atlas of Visualization

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Author : Yasuki Nakayama
Publisher : CRC Press
ISBN 13 : 9780849326578
Total Pages : 294 pages
Book Rating : 4.3/5 (265 download)

Book Synopsis Atlas of Visualization by : Yasuki Nakayama

Download or read book Atlas of Visualization written by Yasuki Nakayama and published by CRC Press. This book was released on 1997-03-24 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Visualization is a novel interdisciplinary science for making any phenomenon clear by visualizing the invisible using computer techniques. The Atlas of Visualization presents the latest advances in visualization techniques, image processing, computer graphics, and visualization of measured and compound results. Focusing on both experimental and computer-aided visualization, this encyclopedic resource discusses all aspects of this new and evolving science. This volume includes cutting-edge information on turbulent flow, vortex, water spray, PIV, jet flames, thermal plume and numerical simulation, and heat and mass transfer. Encompasses all aspects of visualization! The Atlas of Visualization is concerned with all aspects of visualization, not just with engineering and physics applications, but with applications in disciplines such as the biomedical sciences, oceanography, agriculture, meteorology, and sports science. The aim of this book is to provide a medium for announcing the latest advances in visualization. Full color presentation! Books on visualization could not discuss complex phenomena without the use of color photographs. For this reason, the Atlas of Visualization is issued in full color. This allows the complex phenomena to be presented clearly, and combined phenomena are illustrated with quantitative results and detailed structure. Global perspective! The chapters and gravures in the Atlas are contributed by the world's top researchers, and provides both researchers and technicians with extremely useful information from the foremost innovators in the field of visualization. Computer scientists, mechanical engineers, physicists, applied and biological scientists, meteorologists, and sports scientists, as well as students of these disciplines, will find the Atlas of Visualization an essential source of all the latest knowledge in the field of visualization.

Applied Mechanics Reviews

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ISBN 13 :
Total Pages : 934 pages
Book Rating : 4.:/5 (31 download)

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Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1987 with total page 934 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Aeronautical Engineering: A Cumulative Index to a Continuing Bibliography (supplement 287)

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ISBN 13 :
Total Pages : 706 pages
Book Rating : 4.:/5 (317 download)

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A Collection of Technical Papers

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ISBN 13 :
Total Pages : 556 pages
Book Rating : 4.0/5 ( download)

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Download or read book A Collection of Technical Papers written by and published by . This book was released on 1986 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: