Two And Three Dimensional Measurements In Turbulent Nonpremixed Flames

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Two- and Three-Dimensional Measurements in Turbulent Nonpremixed Flames

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (946 download)

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Book Synopsis Two- and Three-Dimensional Measurements in Turbulent Nonpremixed Flames by :

Download or read book Two- and Three-Dimensional Measurements in Turbulent Nonpremixed Flames written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of an ongoing research program aimed at developing techniques capable of quantitative imaging of mixture fraction and scalar dissipation in turbulent flames, three-scalar measurements were made in a turbulent nonpremixed flame. The use of nitrogen Raman scattering to detect a passive conserved scalar made it possible to increase confidence in the two-scalar technique based on simultaneous imaging of Rayleigh scattering and fuel Raman scattering. These experiments showed that proper parameterization of mixture fraction-dependent terms appearing in the expression for mixture fraction can improve accuracy for lean values of mixture fraction as well as those near stoichiometric. Additionally, a new experimental technique was investigated which allows the extraction of velocity information from laser-based scalar imaging in turbulent flows. Preliminary results from simultaneous particle-imaging velocimetry (PIV) and optical flow velocimetry showed that this technique has potential for unseeded velocity measurements compatible with the mixture fraction imaging. The optical flow approach was based on extracting velocity vectors from the intensity variations naturally present in inhomogeneous turbulent flow images of a mixing-dependent scalar quantity.

Two- and Three-Dimensional Measurements in Flames

Author : Marshall B. Long
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Two- and Three-Dimensional Measurements in Flames by : Marshall B. Long

Download or read book Two- and Three-Dimensional Measurements in Flames written by Marshall B. Long and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three-scalar measurements were made in a turbulent nonpremixed flame (Re=15000) to increase confidence in the two-scalar technique based on simultaneous imaging of Rayleigh scattering and fuel Raman scattering. Nitrogen Raman scattering was employed as an passive conserved scalar and mixture fraction was calculated by two independent approaches. These experiments showed that proper parameterization of mixture fraction-dependent terms appearing in the expression for mixture fraction can reduce deficiencies for lean values of mixture fraction and near stoichiometric. Additionally, the spatial resolution of the optical setup was characterized and determined to be sufficient for resolving scalar dissipation.

Two- and Three-dimensional Measurements in Flames

Author : Marshall B. Long
Publisher :
ISBN 13 :
Total Pages : 55 pages
Book Rating : 4.:/5 (45 download)

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Book Synopsis Two- and Three-dimensional Measurements in Flames by : Marshall B. Long

Download or read book Two- and Three-dimensional Measurements in Flames written by Marshall B. Long and published by . This book was released on 1998 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three-scalar measurements were made in a turbulent nonpremixed flame (Re=15000) to increase confidence in the two-scalar technique based on simultaneous imaging of Rayleigh scattering and fuel Raman scattering. Nitrogen Raman scattering was employed as an passive conserved scalar and mixture fraction was calculated by two independent approaches. These experiments showed that proper parameterization of mixture fraction-dependent terms appearing in the expression for mixture fraction can reduce deficiencies for lean values of mixture fraction and near stoichiometric. Additionally, the spatial resolution of the optical setup was characterized and determined to be sufficient for resolving scalar dissipation.

Nonlinear Spectroscopy of Multicomponent Droplets and Two- and Three-Dimensional Measurements in Flames

Author :
Publisher :
ISBN 13 :
Total Pages : 23 pages
Book Rating : 4.:/5 (946 download)

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Book Synopsis Nonlinear Spectroscopy of Multicomponent Droplets and Two- and Three-Dimensional Measurements in Flames by :

Download or read book Nonlinear Spectroscopy of Multicomponent Droplets and Two- and Three-Dimensional Measurements in Flames written by and published by . This book was released on 1997 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Significant progress has been made in the following two research areas: (1) Nonlinear spectroscopy of micrometer-sized multicomponent droplets; and (2) Two- and three-dimensional scalar and velocity mapping. Optical diagnostics that have the potential of providing information on chemical species and temperature of multicomponent liquid droplets have been developed. A brief summary of the research accomplishments in the following three areas: (1) droplet temperature determination with thermochromic dyes; (2) enhancement of stimulated Raman scattering from droplets for identifying chemical species; and (3) modification of droplet lasing characteristics by injection seeding and Q-switching. Progress has been made in developing and applying a technique for obtaining mixture fraction and scalar dissipation in a variety of turbulent nonpremixed flames. The data from these experiments are of use for modeling these complex systems. In premixed flames, simultaneous velocity/scalar images were obtained, along with full three-dimensional gradient and OH information.

Turbulent Combustion

Author : Norbert Peters
Publisher : Cambridge University Press
ISBN 13 : 1139428063
Total Pages : 322 pages
Book Rating : 4.1/5 (394 download)

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Book Synopsis Turbulent Combustion by : Norbert Peters

Download or read book Turbulent Combustion written by Norbert Peters and published by Cambridge University Press. This book was released on 2000-08-15 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: The combustion of fossil fuels remains a key technology for the foreseeable future. It is therefore important that we understand the mechanisms of combustion and, in particular, the role of turbulence within this process. Combustion always takes place within a turbulent flow field for two reasons: turbulence increases the mixing process and enhances combustion, but at the same time combustion releases heat which generates flow instability through buoyancy, thus enhancing the transition to turbulence. The four chapters of this book present a thorough introduction to the field of turbulent combustion. After an overview of modeling approaches, the three remaining chapters consider the three distinct cases of premixed, non-premixed, and partially premixed combustion, respectively. This book will be of value to researchers and students of engineering and applied mathematics by demonstrating the current theories of turbulent combustion within a unified presentation of the field.

Turbulent Premixed Flames

Author : Nedunchezhian Swaminathan
Publisher : Cambridge University Press
ISBN 13 : 1139498584
Total Pages : 447 pages
Book Rating : 4.1/5 (394 download)

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Book Synopsis Turbulent Premixed Flames by : Nedunchezhian Swaminathan

Download or read book Turbulent Premixed Flames written by Nedunchezhian Swaminathan and published by Cambridge University Press. This book was released on 2011-04-25 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: A work on turbulent premixed combustion is important because of increased concern about the environmental impact of combustion and the search for new combustion concepts and technologies. An improved understanding of lean fuel turbulent premixed flames must play a central role in the fundamental science of these new concepts. Lean premixed flames have the potential to offer ultra-low emission levels, but they are notoriously susceptible to combustion oscillations. Thus, sophisticated control measures are inevitably required. The editors' intent is to set out the modeling aspects in the field of turbulent premixed combustion. Good progress has been made on this topic, and this cohesive volume contains contributions from international experts on various subtopics of the lean premixed flame problem.

Fundamentals of Turbulent and Multiphase Combustion

Author : Kenneth Kuan-yun Kuo
Publisher : John Wiley & Sons
ISBN 13 : 0470226226
Total Pages : 914 pages
Book Rating : 4.4/5 (72 download)

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Book Synopsis Fundamentals of Turbulent and Multiphase Combustion by : Kenneth Kuan-yun Kuo

Download or read book Fundamentals of Turbulent and Multiphase Combustion written by Kenneth Kuan-yun Kuo and published by John Wiley & Sons. This book was released on 2012-04-24 with total page 914 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed coverage of advanced combustion topics from the author of Principles of combustion, Second Edition Turbulence, turbulent combustion, and multiphase reacting flows have become major research topics in recent decades due to their application across diverse fields, including energy, environment, propulsion, transportation, industrial safety, and nanotechnology. Most of the knowledge accumulated from this research has never been published in book form—until now. Fundamentals of Turbulent and Multiphase Combustion presents up-to-date, integrated coverage of the fundamentals of turbulence, combustion, and multiphase phenomena along with useful experimental techniques, including non-intrusive, laser-based measurement techniques, providing a firm background in both contemporary and classical approaches. Beginning with two full chapters on laminar premixed and non-premixed flames, this book takes a multiphase approach, beginning with more common topics and moving on to higher-level applications. In addition, Fundamentals of Turbulent and Multiphase Combustion: Addresses seven basic topical areas in combustion and multiphase flows, including laminar premixed and non-premixed flames, theory of turbulence, turbulent premixed and non-premixed flames, and multiphase flows Covers spray atomization and combustion, solid-propellant combustion, homogeneous propellants, nitramines, reacting boundary-layer flows, single energetic particle combustion, and granular bed combustion Provides experimental setups and results whenever appropriate Supported with a large number of examples and problems as well as a solutions manual, Fundamentals of Turbulent and Multiphase Combustion is an important resource for professional engineers and researchers as well as graduate students in mechanical, chemical, and aerospace engineering.

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.:/5 (31 download)

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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 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Application of Crossed-plane Imaging for Three-dimensional Analysis of Premixed Turbulent Flames

Author : Darin Alan Knaus
Publisher :
ISBN 13 :
Total Pages : 414 pages
Book Rating : 4.E/5 ( download)

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Book Synopsis Application of Crossed-plane Imaging for Three-dimensional Analysis of Premixed Turbulent Flames by : Darin Alan Knaus

Download or read book Application of Crossed-plane Imaging for Three-dimensional Analysis of Premixed Turbulent Flames written by Darin Alan Knaus and published by . This book was released on 2003 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Springer Handbook of Experimental Fluid Mechanics

Author : Cameron Tropea
Publisher : Springer Science & Business Media
ISBN 13 : 3540251413
Total Pages : 1570 pages
Book Rating : 4.5/5 (42 download)

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Book Synopsis Springer Handbook of Experimental Fluid Mechanics by : Cameron Tropea

Download or read book Springer Handbook of Experimental Fluid Mechanics written by Cameron Tropea and published by Springer Science & Business Media. This book was released on 2007-10-09 with total page 1570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying DVD-ROM contains ... "all chapters of the Springer Handbook."--Page 3 of cover.

Modeling and Simulation of Turbulent Combustion

Author : Santanu De
Publisher : Springer
ISBN 13 : 9811074100
Total Pages : 663 pages
Book Rating : 4.8/5 (11 download)

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Book Synopsis Modeling and Simulation of Turbulent Combustion by : Santanu De

Download or read book Modeling and Simulation of Turbulent Combustion written by Santanu De and published by Springer. This book was released on 2017-12-12 with total page 663 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive review of state-of-the-art models for turbulent combustion, with special emphasis on the theory, development and applications of combustion models in practical combustion systems. It simplifies the complex multi-scale and nonlinear interaction between chemistry and turbulence to allow a broader audience to understand the modeling and numerical simulations of turbulent combustion, which remains at the forefront of research due to its industrial relevance. Further, the book provides a holistic view by covering a diverse range of basic and advanced topics—from the fundamentals of turbulence–chemistry interactions, role of high-performance computing in combustion simulations, and optimization and reduction techniques for chemical kinetics, to state-of-the-art modeling strategies for turbulent premixed and nonpremixed combustion and their applications in engineering contexts.

Combustion Measurements

Author : Norman Chigier
Publisher : CRC Press
ISBN 13 : 9781560320289
Total Pages : 556 pages
Book Rating : 4.3/5 (22 download)

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Book Synopsis Combustion Measurements by : Norman Chigier

Download or read book Combustion Measurements written by Norman Chigier and published by CRC Press. This book was released on 1991-04-01 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book begins with an introduction to the general problems of making measurements in high temperature and a presentation of chemically reacting flow systems. It describes each instrument with the various diagnostic techniques and discusses measurements that have been made in furnaces, flames, and rocket engines. The detailed measurement techniques described in this book cover a wide spectrum of applications in combustion systems, including gas turbine, rocket measurement techniques that were developed in laboratories. Information obtained on detailed temperature, velocity, particle size, and gas concentration distribution is leading to improve understanding of the chemical combustion process and to design imporvements in combustors.

Turbulent Reactive Flows

Author : R. Borghi
Publisher : Springer Science & Business Media
ISBN 13 : 146139631X
Total Pages : 958 pages
Book Rating : 4.4/5 (613 download)

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Book Synopsis Turbulent Reactive Flows by : R. Borghi

Download or read book Turbulent Reactive Flows written by R. Borghi and published by Springer Science & Business Media. This book was released on 2013-03-08 with total page 958 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent reactive flows are of common occurrance in combustion engineering, chemical reactor technology and various types of engines producing power and thrust utilizing chemical and nuclear fuels. Pollutant formation and dispersion in the atmospheric environment and in rivers, lakes and ocean also involve interactions between turbulence, chemical reactivity and heat and mass transfer processes. Considerable advances have occurred over the past twenty years in the understanding, analysis, measurement, prediction and control of turbulent reactive flows. Two main contributors to such advances are improvements in instrumentation and spectacular growth in computation: hardware, sciences and skills and data processing software, each leading to developments in others. Turbulence presents several features that are situation-specific. Both for that reason and a number of others, it is yet difficult to visualize a so-called solution of the turbulence problem or even a generalized approach to the problem. It appears that recognition of patterns and structures in turbulent flow and their study based on considerations of stability, interactions, chaos and fractal character may be opening up an avenue of research that may be leading to a generalized approach to classification and analysis and, possibly, prediction of specific processes in the flowfield. Predictions for engineering use, on the other hand, can be foreseen for sometime to come to depend upon modeling of selected features of turbulence at various levels of sophistication dictated by perceived need and available capability.

Applied Combustion Diagnostics

Author : KoHse-HoingHaus
Publisher : Taylor & Francis US
ISBN 13 : 9781560329381
Total Pages : 748 pages
Book Rating : 4.3/5 (293 download)

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Book Synopsis Applied Combustion Diagnostics by : KoHse-HoingHaus

Download or read book Applied Combustion Diagnostics written by KoHse-HoingHaus and published by Taylor & Francis US. This book was released on 2002-04-26 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt: The editors have assembled a world-class group of contributors who address the questions the combustion diagnostic community faces. They are chemists who identify the species to be measured and the interfering substances that may be present; physicists, who push the limits of laser spectroscopy and laser devices and who conceive suitable measurement schemes; and engineers, who know combustion systems and processes. This book assists in providing guidance for the planning of combustion experiments, in judging research strategies and in conceiving new ideas for combustion research. It provides a snapshot of the available diagnostic methods and thier typical applications from the perspective of leading experts in the field.

Two-Point Scalar Time-Series Measurements in Turbulent Partially Premixed Flames

Author :
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Two-Point Scalar Time-Series Measurements in Turbulent Partially Premixed Flames by :

Download or read book Two-Point Scalar Time-Series Measurements in Turbulent Partially Premixed Flames written by and published by . This book was released on 2006 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: A two-point method has recently been demonstrated based on picosecond time-resolved laser-induced fluorescence (PITLIF). This technique is capable of simultaneously monitoring OH time series at two locations, hence allowing the characterization of spatial structures in turbulent flames in addition to their temporal behavior. Several refinements have been made to improve upon the previous one-point instrument. Using a specially designed collection-lens system, off-axis optical aberrations have been effectively minimized in the probe volume. Furthermore, additional electronics has been installed which permit absolute species concentration measurements. As a preliminary study, two-point OH time-series measurements were taken in three standard turbulent non-premixed flames (H3, DLR_A and DLR_B). Two-point statistics, including space-time correlations, spatial autocorrelation functions and integral length scales were computed to help elucidate the flame structure and turbulence-chemistry interactions.

Instrumentation for Flows with Combustion

Author : A. M. K. P. Taylor
Publisher :
ISBN 13 :
Total Pages : 576 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Instrumentation for Flows with Combustion by : A. M. K. P. Taylor

Download or read book Instrumentation for Flows with Combustion written by A. M. K. P. Taylor and published by . This book was released on 1993 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several instruments, mostly optical, have recently become available, complimenting progress in computational techniques and contributing to the evaluation of models of turbulence and combustion. This book summarizes the state-of-the-art of the more important instruments in seven chapters. Each includes essential theory but concentrates on the instruments' potential by reference to measurement examples.

Instrumentation for Combustion and Flow in Engines

Author : D.F.G. Durão
Publisher : Springer Science & Business Media
ISBN 13 : 9400922418
Total Pages : 398 pages
Book Rating : 4.4/5 (9 download)

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Book Synopsis Instrumentation for Combustion and Flow in Engines by : D.F.G. Durão

Download or read book Instrumentation for Combustion and Flow in Engines written by D.F.G. Durão and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Much has been said and written about the abilities of modern instrumentation to help solve problems of combustion in engines. In the main, however, the design and fabr ication of combustion chambers continues to be based on extrapolation of exper ience gained from use and rig tests, with little input from advanced techniques such as those based on optical diagnotics. At the same time, it has become increasingly difficult to design better combustion chambers without knowledge of the relevant flow processes. Thus, the future must involve improved understanding which, in turn, will require detailed measurements of velocity, temperature and concentration. The need to narrow the gap between current industrial practice and the acquisition and implementation of improved techniques motivated the organization of the Advanced Study Institute upon which this volume is based. This Institute on Instrumentation for Combustion and Flow in Engines was arranged to display the needs of industry and the possibilities made available by modern instrumentation and, at the same time, to make clear the relative advantages of optical and probe techniques. Held at Vimeiro during the period from 13 to 26 September, 1987, the Institute was attended by 120 participants and 16 invited lecturers.