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The Reduction Of Mixing Noise And Shock Associated Noise Using Chevrons And Other Mixing Enhancement Devices
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Book Synopsis The Reduction of Mixing Noise and Shock Associated Noise Using Chevrons and Other Mixing Enhancement Devices by : Olaf Haller Rask
Download or read book The Reduction of Mixing Noise and Shock Associated Noise Using Chevrons and Other Mixing Enhancement Devices written by Olaf Haller Rask and published by . This book was released on 2009 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: This experimental research project varied nozzle discharge geometries in an effort to reduce jet noise. Chevrons and other mixing enhancement devices introduced streamwise vortices into the initial shear layer of the jet. Single Flow Noise Reduction: Air was injected into the center of streamwise vortices. They were energized and increased mixing across the shear layer, which reduced low frequency noise. The vortices broke down with lower circumferential velocities, which reduced high frequency noise. More robust streamwise vortices created additional mixing. This reduced low frequency noise but created additional high frequency noise. The size of the streamwise vortices was reduced. This did not effect low frequency noise, but reduced high frequency noise. Coaxial Flow Noise Reduction: The noise reduction when using fan and core chevrons together was shown to be additive. Reductions attributed to core chevrons plus reductions attributed to fan chevrons were roughly equal to reductions when both chevron nozzles were installed. Low frequency noise was predominantly generated in the mixed region, which can be modified by either nozzle. The effect was compounded when both chevron nozzles were installed. High frequency noise was predominantly generated in the shear layers. Under the current test conditions, the shear layers were close enough that acoustic measurements could only resolve one noise source. Either chevron nozzle modified noise in the shear layer(s), the effect was compounded when both were installed. Underexpanded Flow Noise Reduction: Baseline and chevron nozzles were used on an underexpanded core stream. Chevrons increased shock associated noise for lower fan flow velocities but reduced shock associated noise for the highest fan flow velocity. Shock associated noise is created as turbulence interacts with shock cells. Both the values of turbulence and the magnitude of pressure fluctuations are important. For the lower fan flow velocities, chevrons increased turbulence but did not effect the pressure fluctuations. This increased shock noise. For the highest fan flow velocity, chevrons did not change turbulence levels but significantly reduced pressure fluctuations. This reduced shock associated noise.
Book Synopsis Intelligent Manufacturing and Energy Sustainability by : P. H. V. Sesha Talpa Sai
Download or read book Intelligent Manufacturing and Energy Sustainability written by P. H. V. Sesha Talpa Sai and published by Springer Nature. This book was released on 2023-12-29 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book includes best selected, high-quality research papers presented at the International Conference on Intelligent Manufacturing and Energy Sustainability (ICIMES 2023) held at the Department of Mechanical Engineering, Malla Reddy College of Engineering & Technology (MRCET), Hyderabad, India, during June 23–24, 2023. It covers topics in the areas of automation, manufacturing technology, and energy sustainability and also includes original works in the intelligent systems, manufacturing, mechanical, electrical, aeronautical, materials, automobile, bioenergy, and energy sustainability.
Book Synopsis Flow and Noise Control: Review and Assessment of Future Directions by : Russell H. Thomas
Download or read book Flow and Noise Control: Review and Assessment of Future Directions written by Russell H. Thomas and published by . This book was released on 2002 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Compressibility, Turbulence and High Speed Flow by : Thomas B. Gatski
Download or read book Compressibility, Turbulence and High Speed Flow written by Thomas B. Gatski and published by Academic Press. This book was released on 2013-03-05 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compressibility, Turbulence and High Speed Flow introduces the reader to the field of compressible turbulence and compressible turbulent flows across a broad speed range, through a unique complimentary treatment of both the theoretical foundations and the measurement and analysis tools currently used. The book provides the reader with the necessary background and current trends in the theoretical and experimental aspects of compressible turbulent flows and compressible turbulence. Detailed derivations of the pertinent equations describing the motion of such turbulent flows is provided and an extensive discussion of the various approaches used in predicting both free shear and wall bounded flows is presented. Experimental measurement techniques common to the compressible flow regime are introduced with particular emphasis on the unique challenges presented by high speed flows. Both experimental and numerical simulation work is supplied throughout to provide the reader with an overall perspective of current trends. - An introduction to current techniques in compressible turbulent flow analysis - An approach that enables engineers to identify and solve complex compressible flow challenges - Prediction methodologies, including the Reynolds-averaged Navier Stokes (RANS) method, scale filtered methods and direct numerical simulation (DNS) - Current strategies focusing on compressible flow control
Book Synopsis 41st AIAA Aerospace Sciences Meeting & Exhibit by :
Download or read book 41st AIAA Aerospace Sciences Meeting & Exhibit written by and published by . This book was released on 2003 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis AIAA Aerospace Sciences Meeting and Exhibit, 42nd by :
Download or read book AIAA Aerospace Sciences Meeting and Exhibit, 42nd written by and published by . This book was released on 2004 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis AIAA Journal by : American Institute of Aeronautics and Astronautics
Download or read book AIAA Journal written by American Institute of Aeronautics and Astronautics and published by . This book was released on 2007 with total page 1184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the ... ASME/JSME Joint Fluids Engineering Conference by :
Download or read book Proceedings of the ... ASME/JSME Joint Fluids Engineering Conference written by and published by . This book was released on 2003 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1978 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aerospace America written by and published by . This book was released on 2004 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit July 11-14, 2004, Fort Lauderdale, FL.: 04-3306 - 04-3349 by :
Download or read book 40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit July 11-14, 2004, Fort Lauderdale, FL.: 04-3306 - 04-3349 written by and published by . This book was released on 2004 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aviation Noise Impact Management by : Laurent Leylekian
Download or read book Aviation Noise Impact Management written by Laurent Leylekian and published by Springer. This book was released on 2022-03-15 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book provides a view into the state-of-the-art research on aviation noise and related annoyance. The book will primarily focus on the achievements of the ANIMA project (Aviation Noise Impact Management through Novel Approaches), but not exclusively. The content has a broader theme in order to encompass. regulation issues, the ICAO (International Civil Aviation Organization) balanced approach, progresses made on technologies and reduction of noise at source, impact of possible future civil supersonic aircraft, land-use planning issues, as well as the core topics of the ANIMA project, i.e. impact on human beings, annoyance, quality of life, health and findings of the project in this respect. This book differs from traditional research programmes on aviation noise as the authors endeavour, not to lower noise at source, but to reduce the annoyance. This book examines these non-acoustic factors in an effort to help those most affected by aviation noise – communities living close to airports, and also help airport managers, policy-makers, local authorities and researchers to deal with this issue holistically. The book concludes with some recommendations for EU, national and local policy-makers, airport and aviation authorities, and more broadly a scientifically literate audience. These recommendations may help to identify gaps for progress in terms of research but also genuine implementation actions for political and regulatory authorities.
Book Synopsis Applied Gas Dynamics by : Ethirajan Rathakrishnan
Download or read book Applied Gas Dynamics written by Ethirajan Rathakrishnan and published by John Wiley & Sons. This book was released on 2010-10-04 with total page 663 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Applied Gas Dynamics, Professor Ethirajan Rathakrishnan introduces the high-tech science of gas dynamics, from a definition of the subject to the three essential processes of this science, namely, the isentropic process, shock and expansion process, and Fanno and Rayleigh flows. The material is presented in such a manner that beginners can follow the subject comfortably. Rathakrishnan also covers the theoretical and application aspects of high-speed flows in which enthalpy change becomes significant. Covers both theory and applications Explains involved aspects of flow processes in detail Provides a large number of worked through examples in all chapters Reinforces learning with concise summaries at the end of every chapter Contains a liberal number of exercise problems with answers Discusses ram jet and jet theory -- unique topics of use to all working in the field Classroom tested at introductory and advanced levels Solutions manual and lecture slides available for instructors Applied Gas Dynamics is aimed at graduate students and advanced undergraduates in Aerospace Engineering and Mechanical Engineering who are taking courses such as Gas Dynamics, Compressible Flows, High-Speed Aerodynamics, Applied Gas Dynamics, Experimental Aerodynamics and High-Enthalpy Flows. Practicing engineers and researchers working with high speed flows will also find this book helpful. Lecture materials for instructors available at http://www.wiley.com/go/gasdyn
Download or read book Extrusion written by Harold F. Giles Jr and published by William Andrew. This book was released on 2013-09-21 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of Extrusion is designed to aid operators, engineers, and managers in extrusion processing in quickly answering practical day-to-day questions. The first part of the book provides the fundamental principles, for operators and engineers, of polymeric materials extrusion processing in single and twin screw extruders. The next section covers advanced topics including troubleshooting, auxiliary equipment, and coextrusion for operators, engineers, and managers. The final part provides applications case studies in key areas for engineers such as compounding, blown film, extrusion blow molding, coating, foam, and reprocessing. This practical guide to extrusion brings together both equipment and materials processing aspects. It covers basic and advanced topics, for reference and training, in thermoplastics processing in the extruder. Detailed reference data are provided on such important operating conditions as temperatures, start-up procedures, shear rates, pressure drops, and safety. - A practical guide to the selection, design and optimization of extrusion processes and equipment - Designed to improve production efficiency and product quality - Focuses on practical fault analysis and troubleshooting techniques
Book Synopsis Processing of Heavy Crude Oils by : Ramasamy Marappa Gounder
Download or read book Processing of Heavy Crude Oils written by Ramasamy Marappa Gounder and published by . This book was released on 2019-12-18 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 43rd AIAA Aerospace Sciences Meeting & Exhibit by :
Download or read book 43rd AIAA Aerospace Sciences Meeting & Exhibit written by and published by . This book was released on 2005 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lunar Sourcebook written by Grant Heiken and published by CUP Archive. This book was released on 1991-04-26 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only work to date to collect data gathered during the American and Soviet missions in an accessible and complete reference of current scientific and technical information about the Moon.
