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Flow Environment Study Near The Empennage Of A 15 Percent Scale Helicopter Model
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Book Synopsis Flow Environment Study Near the Empennage of a 15-Percent Scale Helicopter Model by : Susan Althoff Gorton
Download or read book Flow Environment Study Near the Empennage of a 15-Percent Scale Helicopter Model written by Susan Althoff Gorton and published by . This book was released on 2000 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of advanced rotorcraft configurations has highlighted a need for high-quality experimental data to support the development of flexible and accurate analytical design tools. To provide this type of data, a test program was conducted in the Langley 14- by 22-Foot Subsonic Tunnel to measure the flow near the empennage of a 15-percent scale powered helicopter model with an operating tail fan. Three-component velocity profiles were measured with laser velocimetry (LV) one chord forward of the horizontal tail for four advance ratios to evaluate the effect of the rotor wake impingement on the horizontal tail angle of attack. These velocity data indicate the horizontal tail can experience unsteady angle of attack variations of over 30 degress due to the rotor wake influence. The horizontal tail is most affected by the rotor wake above advance ratios of 0.10. Velocity measurements of the flow on the inlet side of the tail fan were made for a low-speed flight condition using conventional LV techniques. The velocity data show an accelerated flow near the tail fan duct, and vorticity calculations track the passage of main rotor wake vortices through the measurement plane.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720526216 Total Pages :30 pages Book Rating :4.5/5 (262 download)
Book Synopsis Flow Environment Study Near the Empennage of a 15-Percent Scale Helicopter Model by : National Aeronautics and Space Administration (NASA)
Download or read book Flow Environment Study Near the Empennage of a 15-Percent Scale Helicopter Model written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-31 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of advanced rotorcraft configurations has highlighted a need for high-quality experimental data to support the development of flexible and accurate analytical design tools. To provide this type of data, a test program was conducted in the Langley 14- by 22-Foot Subsonic Tunnel to measure the flow near the empennage of a 15-percent scale powered helicopter model with an operating tail fan. Three-component velocity profiles were measured with laser velocimetry (LV) one chord forward of the horizontal tail for four advance ratios to evaluate the effect of the rotor wake impingement on the horizontal tail angle of attack. These velocity data indicate the horizontal tail can experience unsteady angle of attack variations of over 30 degrees due to the rotor wake influence. The horizontal tail is most affected by the rotor wake above advance ratios of 0.10. Velocity measurements of the flow on the inlet side of the tail fan were made for a low-speed flight condition using conventional LV techniques. The velocity data show an accelerated flow near the tail fan duct, and vorticity calculations track the passage of main rotor wake vortices through the measurement plane.Gorton, Susan Althoff and Berry, John D. and Hodges, W. Todd and Reis, Deane G.Langley Research CenterHELICOPTERS; DESIGN ANALYSIS; HORIZONTAL TAIL SURFACES; ROTARY WING AIRCRAFT; SCALE MODELS; ANGLE OF ATTACK; VORTICITY; WAKES; VELOCITY MEASUREMENT; VELOCITY DISTRIBUTION
Book Synopsis NASA Langley Scientific and Technical Information Output 2000 by :
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Book Synopsis Scientific and Technical Aerospace Reports by :
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Book Synopsis The History of the XV-15 Tilt Rotor Research Aircraft by : Martin D. Maisel
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Book Synopsis Rotary-Wing Aerodynamics by : W. Z. Stepniewski
Download or read book Rotary-Wing Aerodynamics written by W. Z. Stepniewski and published by Courier Corporation. This book was released on 2013-04-22 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: DIVClear, concise text covers aerodynamic phenomena of the rotor and offers guidelines for helicopter performance evaluation. Originally prepared for NASA. Prefaces. New Indexes. 10 black-and-white photos. 537 figures. /div
Book Synopsis Aging of U.S. Air Force Aircraft by : National Research Council
Download or read book Aging of U.S. Air Force Aircraft written by National Research Council and published by National Academies Press. This book was released on 1997-09-30 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many of the aircraft that form the backbone of the U.S. Air Force operational fleet are 25 years old or older. A few of these will be replaced with new aircraft, but many are expected to remain in service an additional 25 years or more. This book provides a strategy to address the technical needs and priorities associated with the Air Force's aging airframe structures. It includes a detailed summary of the structural status of the aging force, identification of key technical issues, recommendations for near-term engineering and management actions, and prioritized near-term and long-term research recommendations.
Author :National Research Council (U.S.). Committee on Aeronautical Technologies Publisher : ISBN 13 : Total Pages :21 pages Book Rating :4.:/5 (269 download)
Book Synopsis Aeronautical Technologies for the Twenty-first Century by : National Research Council (U.S.). Committee on Aeronautical Technologies
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Book Synopsis International Aerospace Abstracts by :
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Book Synopsis Flight Stability and Automatic Control by : Robert C. Nelson
Download or read book Flight Stability and Automatic Control written by Robert C. Nelson and published by . This book was released on 1998 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edition of this this flight stability and controls guide features an unintimidating math level, full coverage of terminology, and expanded discussions of classical to modern control theory and autopilot designs. Extensive examples, problems, and historical notes, make this concise book a vital addition to the engineer's library.
Book Synopsis Government Reports Announcements & Index by :
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Book Synopsis Aeronautical Engineering: A Cumulative Index to a Continuing Bibliography by :
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Book Synopsis NASA Scientific and Technical Publications by :
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Book Synopsis Status of Spin Research for Recent Airplane Designs by : A. I. Neihouse
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Book Synopsis Riveted Lap Joints in Aircraft Fuselage by : Andrzej Skorupa
Download or read book Riveted Lap Joints in Aircraft Fuselage written by Andrzej Skorupa and published by Springer Science & Business Media. This book was released on 2012-06-23 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue of the pressurized fuselages of transport aircraft is a significant problem all builders and users of aircraft have to cope with for reasons associated with assuring a sufficient lifetime and safety, and formulating adequate inspection procedures. These aspects are all addressed in various formal protocols for creating and maintaining airworthiness, including damage tolerance considerations. In most transport aircraft, fatigue occurs in lap joints, sometimes leading to circumstances that threaten safety in critical ways. The problem of fatigue of lap joints has been considerably enlarged by the goal of extending aircraft lifetimes. Fatigue of riveted lap joints between aluminium alloy sheets, typical of the pressurized aircraft fuselage, is the major topic of the present book. The richly illustrated and well-structured chapters treat subjects such as: structural design solutions and loading conditions for fuselage skin joints; relevance of laboratory test results for simple lap joint specimens to riveted joints in a real structure; effect of various production and design related variables on the riveted joint fatigue behaviour; analytical and experimental results on load transmission in mechanically fastened lap joints; theoretical and experimental analysis of secondary bending and its implications for riveted joint fatigue performance; nucleation and shape development of fatigue cracks in riveted longitudinal lap joints; overview of experimental investigations into the multi-site damage for full scale fuselage panels and riveted lap joint specimens; fatigue crack growth and fatigue life prediction methodology for riveted lap joints; residual strength predictions for riveted lap joints in a fuselage structure. The major issues of each chapter are recapitulated in the last section.
