Advanced Turbofan Duct Liner Concepts
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Advanced Turbofan Duct Liner Concepts
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Author :
language : en
Publisher:
Release Date : 1999
Advanced Turbofan Duct Liner Concepts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Advanced Turbofan Duct Liner Concepts
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-06-27
Advanced Turbofan Duct Liner Concepts written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-27 with categories.
The Advanced Subsonic Technology Noise Reduction Program goal is to reduce aircraft noise by 10 EPNdB by the year 2000 relative, to 1992 technology. The improvement goal for nacelle attenuation is 25% relative to 1992 technology by 1997 and 50% by 2000. The Advanced Turbofan Duct Liner Concepts Task work by Boeing presented in this document was in support of these goals. The basis for the technical approach was a Boeing study conducted in 1993-94 under NASA/FAA contract NAS1-19349, Task 6, investigating broadband acoustic liner concepts. As a result of this work, it was recommended that linear double layer, linear and perforate triple layer, parallel element, and bulk absorber liners be further investigated to improve nacelle attenuations. NASA LaRC also suggested that "adaptive" liner concepts that would allow "in-situ" acoustic impedance control also be considered. As a result, bias flow and high-temperature liner concepts were also added to the investigation. The major conclusion from the above studies is that improvements in nacelle liner average acoustic impedance characteristics alone will not result in 25% increased nacelle noise reduction relative to 1992 technology. Nacelle design advancements currently being developed by Boeing are expected to add 20-40% more acoustic lining to hardwall regions in current inlets, which is predicted to result in and additional 40-80% attenuation improvement. Similar advancements are expected to allow 10-30% more acoustic lining in current fan ducts with 10-30% more attenuation expected. In addition, Boeing is currently developing a scarf inlet concept which is expected to give an additional 40-80% attenuation improvement for equivalent lining areas. Bielak, Gerald W. and Premo, John W. and Hersh, Alan S. Langley Research Center NAS1-20090; RTOP 538-03-12-02
Advanced Nacelle Acoustic Lining Concepts Development
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Author :
language : en
Publisher:
Release Date : 2002
Advanced Nacelle Acoustic Lining Concepts Development written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Fundamentals Of Aeroacoustics With Applications To Aeropropulsion Systems
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Author : Xiaofeng Sun
language : en
Publisher: Elsevier
Release Date : 2020-10-14
Fundamentals Of Aeroacoustics With Applications To Aeropropulsion Systems written by Xiaofeng Sun and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-10-14 with Technology & Engineering categories.
Fundamentals of Aeroacoustics with Applications to Aeropropulsion Systems from the Shanghai Jiao Tong University Press Aerospace series, is the go-to reference on the topic, providing a modern take on the fundamental theory and applications relating to prediction and control of all major noise sources in aeropropulsion systems. This important reference compiles the latest knowledge and research advances, considering both the physics of aerodynamic noise generation in aero-engines and related numerical prediction techniques. Additionally, it introduces new vortex sound interaction models, a transfer element method, and a combustion instability model developed by the authors. Focusing on propulsion systems from inlet to exit, including combustion noise, this new resource will aid graduate students, researchers, and R&D engineers in solving the aircraft noise problems that currently challenge the industry. - Updates the knowledge-base on the sound source generated by aeropropulsion systems, from inlet to exit, including combustion noise - Covers new aerodynamic noise control technology aimed at the low-noise design of next generation aero-engines, including topics such as aerodynamic noise and aero-engine noise control - Includes new, cutting-edge models and methods developed by an author team led by the editor-in-chief of the Chinese Journal of Aeronautics and Astronautics - Considers both the physics of aerodynamic noise generation in aero-engines and related numerical prediction techniques
Advanced Aircraft Flight Performance
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Author : Antonio Filippone
language : en
Publisher: Cambridge University Press
Release Date : 2012-12-17
Advanced Aircraft Flight Performance written by Antonio Filippone and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-17 with Technology & Engineering categories.
This book discusses aircraft flight performance, focusing on commercial aircraft but also considering examples of high-performance military aircraft. The framework is a multidisciplinary engineering analysis, fully supported by flight simulation, with software validation at several levels. The book covers topics such as geometrical configurations, configuration aerodynamics and determination of aerodynamic derivatives, weight engineering, propulsion systems (gas turbine engines and propellers), aircraft trim, flight envelopes, mission analysis, trajectory optimisation, aircraft noise, noise trajectories and analysis of environmental performance. A unique feature of this book is the discussion and analysis of the environmental performance of the aircraft, focusing on topics such as aircraft noise and carbon dioxide emissions.
Nasa Langley Scientific And Technical Information Output 1999
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Author :
language : en
Publisher:
Release Date : 2000
Nasa Langley Scientific And Technical Information Output 1999 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Astronautics categories.
Duct Wall Impedance Control As An Advanced Concept For Acoustic Impression
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Author :
language : en
Publisher:
Release Date : 1975
Duct Wall Impedance Control As An Advanced Concept For Acoustic Impression written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with categories.
Monthly Catalog Of United States Government Publications
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Author :
language : en
Publisher:
Release Date : 1999-07
Monthly Catalog Of United States Government Publications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-07 with Government publications categories.
Green Aviation
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Author : Ramesh Agarwal
language : en
Publisher: John Wiley & Sons
Release Date : 2016-10-17
Green Aviation written by Ramesh Agarwal and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-10-17 with Technology & Engineering categories.
Green Aviation is the first authoritative overview of both engineering and operational measures to mitigate the environmental impact of aviation. It addresses the current status of measures to reduce the environmental impact of air travel. The chapters cover such items as: Engineering and technology-related subjects (aerodynamics, engines, fuels, structures, etc.), Operations (air traffic management and infrastructure) Policy and regulatory aspects regarding atmospheric and noise pollution. With contributions from leading experts, this volume is intended to be a valuable addition, and useful resource, for aerospace manufacturers and suppliers, governmental and industrial aerospace research establishments, airline and aviation industries, university engineering and science departments, and industry analysts, consultants, and researchers.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1992
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Aeronautics categories.