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Author: Gordon C. Oates
Publisher: AIAA
ISBN: 9781600860065
Category : Aerothermodynamics
Languages : en
Pages : 476
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Book Description
Author: Gordon C. Oates
Publisher: AIAA
ISBN: 9781600860065
Category : Aerothermodynamics
Languages : en
Pages : 476
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Book Description
Author: R. I. Sujith
Publisher: Springer Nature
ISBN: 3030811352
Category : Science
Languages : en
Pages : 484
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Book Description
This book systematically presents the consolidated findings of the phenomenon of self-organization observed during the onset of thermoacoustic instability using approaches from dynamical systems and complex systems theory. Over the last decade, several complex dynamical states beyond limit cycle oscillations such as quasiperiodicity, frequency-locking, period-n, chaos, strange non-chaos, and intermittency have been discovered in thermoacoustic systems operated in laminar and turbulent flow regimes. During the onset of thermoacoustic instability in turbulent systems, an ordered acoustic field and large coherent vortices emerge from the background of turbulent combustion. This emergence of order from disorder in both temporal and spatiotemporal dynamics is explored in the contexts of synchronization, pattern formation, collective interaction, multifractality, and complex networks. For the past six decades, the spontaneous emergence of large amplitude, self-sustained, tonal oscillations in confined combustion systems, characterized as thermoacoustic instability, has remained one of the most challenging areas of research. The presence of such instabilities continues to hinder the development and deployment of high-performance combustion systems used in power generation and propulsion applications. Even with the advent of sophisticated measurement techniques to aid experimental investigations and vast improvements in computational power necessary to capture flow physics in high fidelity simulations, conventional reductionist approaches have not succeeded in explaining the plethora of dynamical behaviors and the associated complexities that arise in practical combustion systems. As a result, models and theories based on such approaches are limited in their application to mitigate or evade thermoacoustic instabilities, which continue to be among the biggest concerns for engine manufacturers today. This book helps to overcome these limitations by providing appropriate methodologies to deal with nonlinear thermoacoustic oscillations, and by developing control strategies that can mitigate and forewarn thermoacoustic instabilities. The book is also beneficial to scientists and engineers studying the occurrence of several other instabilities, such as flow-induced vibrations, compressor surge, aeroacoustics and aeroelastic instabilities in diverse fluid-mechanical environments, to graduate students who intend to apply dynamical systems and complex systems approach to their areas of research, and to physicists who look for experimental applications of their theoretical findings on nonlinear and complex systems.
Author: F. Culick
Publisher: Springer Science & Business Media
ISBN: 9400916205
Category : Technology & Engineering
Languages : en
Pages : 560
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Book Description
This book contains selected papers prepared for the NATO Advanced Study Institute on "Unsteady Combustion", which was held in Praia da Granja, Portugal, 6-17 September 1993. Approximately 100 delegates from 14 countries attended. The Institute was the most recent in a series beginning with "Instrumentation for Combustion and Flow in Engines", held in Vimeiro, Portugal 1987 and followed by "Combusting Flow Diagnostics" conducted in Montechoro, Portugal in 1990. Together, these three Institutes have covered a wide range of experimental and theoretical topics arising in the research and development of combustion systems with particular emphasis on gas-turbine combustors and internal combustion engines. The emphasis has evolved roughly from instrumentation and experimental techniques to the mixture of experiment, theory and computational work covered in the present volume. As the title of this book implies, the chief aim of this Institute was to provide a broad sampling of problems arising with time-dependent behaviour in combustors. In fact, of course, that intention encompasses practically all possibilities, for "steady" combustion hardly exists if one looks sufficiently closely at the processes in a combustion chamber. The point really is that, apart from the excellent paper by Bahr (Chapter 10) discussing the technology of combustors for aircraft gas turbines, little attention is directed to matters of steady performance. The volume is divided into three parts devoted to the subjects of combustion-induced oscillations; combustion in internal combustion engines; and experimental techniques and modelling.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 500
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Book Description
Author: American Society of Mechanical Engineers. Winter Annual Meeting
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 106
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Book Description
Author: Anna Schwarz
Publisher: Springer Science & Business Media
ISBN: 3642020380
Category : Technology & Engineering
Languages : en
Pages : 304
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Book Description
November, 2008 Anna Schwarz, Johannes Janicka In the last thirty years noise emission has developed into a topic of increasing importance to society and economy. In ?elds such as air, road and rail traf?c, the control of noise emissions and development of associated noise-reduction techno- gies is a central requirement for social acceptance and economical competitiveness. The noise emission of combustion systems is a major part of the task of noise - duction. The following aspects motivate research: • Modern combustion chambers in technical combustion systems with low pol- tion exhausts are 5 - 8 dB louder compared to their predecessors. In the ope- tional state the noise pressure levels achieved can even be 10-15 dB louder. • High capacity torches in the chemical industry are usually placed at ground level because of the reasons of noise emissions instead of being placed at a height suitable for safety and security. • For airplanes the combustion emissions become a more and more important topic. The combustion instability and noise issues are one major obstacle for the introduction of green technologies as lean fuel combustion and premixed burners in aero-engines. The direct and indirect contribution of combustion noise to the overall core noise is still under discussion. However, it is clear that the core noise besides the fan tone will become an important noise source in future aero-engine designs. To further reduce the jet noise, geared ultra high bypass ratio fans are driven by only a few highly loaded turbine stages.
Author: David T. Harrje
Publisher:
ISBN:
Category : Liquid propellant rockets
Languages : en
Pages : 668
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Book Description
The solution of problems of combustion instability for more effective communication between the various workers in this field is considered. The extent of combustion instability problems in liquid propellant rocket engines and recommendations for their solution are discussed. The most significant developments, both theoretical and experimental, are presented, with emphasis on fundamental principles and relationships between alternative approaches.
Author: Gianfranco Angelino
Publisher: Springer Science & Business Media
ISBN: 9780387974170
Category : Gardening
Languages : en
Pages : 414
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Book Description
This volume, published in honor of Professor Corrado Casci, celebrates the life of a very distinguished international figure devoted to sCientific study, research, teaching, and leadership. The numerous contributions of Corrado CasCi are widely admired by scientists and engineers around the globe. He has been an impressive model and outstanding colleague to many researchers. Unfortunately, only a few of them could be invited to contribute to this honorific volume. Everyone of the invited contributors responded with enthusiasm. v Corrado Casci Contents Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IX Curriculum Vitae . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Xl Publications of Corrado Casci . . . . . . . . . . . . . . . . . . . . . . . . . . . xix . . . . . . . . . I. Combustion 1. Mechanics of Turbulent Flow in Combustors for Premixed Gases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 A. K. OPPENHEIM 2. A Pore-Structure-Independent Combustion Model for Porous Media with Application to Graphite Oxidation 19 M. B. RICHARDS AND S. S. PENNER 3. Stabilization of Hydrogen-Air Flames in Supersonic Flow. . 37 G. WINTERFELD 4. Thermodynamics of Refractory Material Formation by Combustion Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . 49 I. GLASSMAN, K. BREZINSKY, AND K. A. DAVIS 5. Catalytic Combustion Processes . . . . . . . . . . . . . . . . . . . . . . 63 A. P. GLASKOVA 6. Stability of Ignition Transients of Reactive Solid Mixtures 83 V. E. ZARKO 7. Combustion Modeling and Stability of Double-Base Solid Rocket Propellants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 L. DE LUCA AND L. GALFETTI 8. Combustion Instabilities and Rayleigh's Criterion 135 F. E. C. CULICK II. Liquid Sprays 9. On the Anisotropy of Drop and Particle Velocity Fluctuations in Two-Phase Round Gas Jets . . . . . . . . . . . . . 155 A. TOMBOULIDES, M. l ANDREWS, AND F. V. BRACCO vii viii Contents 10.
Author: Tim C. Lieuwen
Publisher: Cambridge University Press
ISBN: 1108841317
Category : Science
Languages : en
Pages : 533
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Book Description
Explore a unified treatment of the dynamics of combustor systems, including acoustics, fluid mechanics, and combustion in a single rigorous text. This updated new edition features an expansion of data and experimental material, updates the coverage of flow stability, and enhanced treatment of flame dynamics. Addresses system dynamics of clean energy and propulsion systems used in low emissions systems. Synthesizing the fields of fluid mechanics and combustion into a coherent understanding of the intrinsically unsteady processes in combustors. This is a perfect reference for engineers and researchers in fluid mechanics, combustion, and clean energy.
