A Study of a Class of Thermoacoustic Oscillations PDF Download
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Author: Edward Michael Kerwin
Publisher:
ISBN:
Category :
Languages : en
Pages : 264
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Author: Edward Michael Kerwin
Publisher:
ISBN:
Category :
Languages : en
Pages : 264
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Author: Douglas Martin Nark
Publisher:
ISBN:
Category :
Languages : en
Pages : 222
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Author: André Sven Paul Niederberger
Publisher: Cuvillier Verlag
ISBN: 3865379052
Category :
Languages : en
Pages : 219
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Author: Umut Zalluhoglu
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages :
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Thermoacoustic instability arises from the interaction between unsteady heat release and pressure perturbations in an acoustic enclosure. The pressure oscillations grow and lead to excessive stress reversals in the structure, raising fatigue concerns and mechanical failures. This common phenomenon in the realistic combustors and rocket engines has been broadly studied over a simplistic laboratory abstraction called the Rijke tube. This simple set-up offers a convenient platform to elucidate the fundamental physics of thermoacoustic instabilities. As evident from the most recent literature, there are numerous aspects of this phenomenon even in the Rijke tube setting that are not fully understood and explored. The current work addresses some of them by forming a bridge between thermoacoustics research and time delay systems stability theory. Under certain conditions, this phenomenon can be modeled as a linear time-invariant dynamics which is affected by multiple time delays. Moreover it falls into the â€neutral†time delay systems sub-class, stability analysis of which is notoriously challenging. In order to assess its stability, a recent mathematical paradigm called the Cluster Treatment of Characteristic Roots (CTCR) is used throughout this work. This combination forms the key contributions of this doctoral study, which are summarized as: (i) Analytical prediction of thermoacoustic instability in Rijke tube in the parametric space of the system. (ii) Introduction of a time-delayed integral controller. This approach leads to novel frontiers for feedback stabilization of thermoacoustic oscillations via a holistic analysis. (iii) Parametric assessment of passive control of thermoacoustic instability using Helmholtz resonator. Specifically geometric characteristics are investigated to stabilize an unstable operation. (iv) Introduction of active-passive stabilization methods, combining a Helmholtz resonator and a feedback loop over a Rijke tube. A new capability is developed to predict control-induced instabilities over this setting. All of these analytically-discovered features are verified with experiments performed in the Advanced Laboratory for Automation, Robotics and Manufacturing. This unique approach is expected to improve the initial design efforts of real-world combustors.
Author: R. I. Sujith
Publisher: Springer Nature
ISBN: 3030811352
Category : Science
Languages : en
Pages : 484
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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: George H. Markstein
Publisher: Elsevier
ISBN: 1483221628
Category : Science
Languages : en
Pages : 339
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Nonsteady Flame Propagation provides information pertinent to flame propagation in gaseous media. This book focuses on linearized treatments and the comparison of their results with experimental observations. Organized into nine chapters, this book begins with an overview of the challenge of nonlinear problems and examines the essentially nonlinear character of the flame phenomena, which has been artificially suppressed in analyses by the use of linearized perturbation treatments. This text then summarizes the development regarding rocket-shaped burners. Other chapters consider the advantages as well as the limitations of linearized analyses. This book discusses as well a general treatment of the discontinuous-flame-front model and summarizes the results of studies of burner that use secondary air. The final chapter deals with re-examining the possibilities of using pulsating combustion in propulsion or in other applications. This book is a valuable resource for chemical engineers, chemists, scientists, and research workers.
Author: Nobumasa Sugimoto
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Tetsushi Biwa
Publisher: World Scientific
ISBN: 1944659781
Category : Technology & Engineering
Languages : en
Pages : 327
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Book Description
Oscillations of gas and/or liquid columns in a flow channel can lead to various phenomena such as Stirling cycle heat engines, pulse tube refrigerators, as well as thermally induced gas oscillations like Sondhauss tube and Rijke tube. Although those phenomena may look different from each other, they can be universally described by the concepts of work flow and heat flow. Work flow stands for the acoustic power used in acoustics. Heat flow is the energy flow associated with the hydrodynamic transport of entropy. These energy flows help us to understand the thermoacoustic phenomena and construct acoustical heat engines.The book aims to provide a comprehensive overview of how the oscillations of gas and/or liquid columns make possible the mutual energy conversions between work flow and heat flow through thermal interactions between fluids and channel walls. The thermodynamic aspects of energy flows are highlighted by introducing Lagrangian point of view to explain the thermodynamic cycles that the fluid parcels undergo. The relevant experimental results are provided to verify the theoretical analysis based on basic equations of fluid dynamics.
Author: Gregory W. Swift
Publisher: Springer
ISBN: 3319669338
Category : Science
Languages : en
Pages : 340
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Book Description
This updated new edition provides an introduction to the field of thermoacoustics. All of the key aspects of the topic are introduced, with the goal of helping the reader to acquire both an intuitive understanding and the ability to design hardware, build it, and assess its performance. Weaving together intuition, mathematics, and experimental results, this text equips readers with the tools to bridge the fields of thermodynamics and acoustics. At the same time, it remains firmly grounded in experimental results, basing its discussions on the distillation of a body of experiments spanning several decades and countries. The book begins with detailed treatment of the fundamental physical laws that underlie thermoacoustics. It then goes on to discuss key concepts, including simple oscillations, waves, power, and efficiency. The remaining portions of the book delve into more advanced topics and address practical concerns in applications chapters on hardware and measurements. With its careful progression and end-of-chapter exercises, this book will appeal to graduate students in physics and engineering as well as researchers and practitioners in either acoustics or thermodynamics looking to explore the possibilities of thermoacoustics. This revised and expanded second edition has been updated with an eye to modern technology, including computer animations and DeltaEC examples.
Author: Stefan Benedikt Jaensch
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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