Stretch Induced Quenching In Flame Vortex Interactions

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Stretch-Induced Quenching in Flame-Vortex Interactions

Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781792848421
Total Pages : 30 pages
Book Rating : 4.8/5 (484 download)

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Book Synopsis Stretch-Induced Quenching in Flame-Vortex Interactions by : National Aeronautics and Space Adm Nasa

Download or read book Stretch-Induced Quenching in Flame-Vortex Interactions written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-04 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The flame-vortex interaction problem is a natural configuration in which several issues relevant to turbulent combustion can be addressed: effect of strain-rate and curvature, effect of the Lewis number, effect of heat losses, effect of complex chemistry, and flame-generated turbulence. In such an approach, the interaction of an isolated vortex with a laminar premixed flame is viewed as a unit process of a turbulent premixed flame in which the reaction zone keeps a laminar like structure locally; this is precisely the case of the wrinkled flame or flamelet regime in turbulent combustion. The present work complements previous studies and involves the study of the interaction of a vortex pair and a laminar premixed flame in a planar two-dimensional geometry, together with numerical simulations. This geometry is quite unique since most studies have considered axisymmetric vortex rings. Such a geometry offers several advantages over previous studies. Samaniego, J.-M. ...

A Premixed Laminar Flame Interacting with a Vortex Resulting in Flame Stretch and Quenching

Author : William Lafayette Roberts IV.
Publisher :
ISBN 13 :
Total Pages : 382 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis A Premixed Laminar Flame Interacting with a Vortex Resulting in Flame Stretch and Quenching by : William Lafayette Roberts IV.

Download or read book A Premixed Laminar Flame Interacting with a Vortex Resulting in Flame Stretch and Quenching written by William Lafayette Roberts IV. and published by . This book was released on 1992 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Experimental Quantification of Transient Stretch Effects from Vortices Interacting with Premixed Flames

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (656 download)

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Book Synopsis Experimental Quantification of Transient Stretch Effects from Vortices Interacting with Premixed Flames by :

Download or read book Experimental Quantification of Transient Stretch Effects from Vortices Interacting with Premixed Flames written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The understanding of complex premixed combustion reactions is paramount to the development of new concepts and devices used to increase the overall usefulness and capabilities of current technology. The evolution from laminar spherically propagating flames to turbulent chemistry is a logical and necessary process to study the complex interactions which occur within any modern practical combustion device. Methane-air flames were chosen to observe the mild affects of thermo-diffusive stability. Five primary propane equivalence ratios were utilized for investigation: 0.69, 0.87, 1.08, 1.32, and 1.49. The choice of equivalence ratio was strategically made so that the 0.69/1.49 and 0.87/1.32 mixtures have the same undiluted flame propagation rate, dr/dt. Therefore, in the undiluted case, there are two flame speeds represented by these mixtures. Three vortices were selected to be used in this investigation. The vortex rotational velocities were measured to be 77 cm/s, 266 cm/s and 398 cm/s for the â€œweakâ€, â€œmediumâ€ and â€œstrongâ€ vortices, respectively. Ignition of the flame occurred in two ways: (1) spark-ignition or (2) laser ignition using an Nd:YAG laser at its second harmonic in order to quantify the effect of electrode interference. Accompanying high-speed chemiluminescence imaging measurements, instantaneous pressure measurements were obtained to give a more detailed understanding of the effect of vortex strength on reactant consumption rate over an extended time scale and to explore the use of a simple measurement to describe turbulent mixing. Further local flame-vortex interface analysis was conducted using non-invasive laser diagnostics, such as particle image velocimetry and planer laser induced fluorescence of the OH radical. The dependence of heat release rate on temperature provides an estimation of the strain rate dependence of the reaction rate.

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 692 pages
Book Rating : 4.:/5 (3 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 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Measurements of Flame-vortex Interaction Dynamics and Chemistry

Author : Charles Jeffrey Mueller
Publisher :
ISBN 13 :
Total Pages : 334 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Measurements of Flame-vortex Interaction Dynamics and Chemistry by : Charles Jeffrey Mueller

Download or read book Measurements of Flame-vortex Interaction Dynamics and Chemistry written by Charles Jeffrey Mueller and published by . This book was released on 1996 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Theoretical and Numerical Combustion

Author : Thierry Poinsot
Publisher : R.T. Edwards, Inc.
ISBN 13 : 9781930217102
Total Pages : 544 pages
Book Rating : 4.2/5 (171 download)

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Book Synopsis Theoretical and Numerical Combustion by : Thierry Poinsot

Download or read book Theoretical and Numerical Combustion written by Thierry Poinsot and published by R.T. Edwards, Inc.. This book was released on 2005 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introducing numerical techniques for combustion, this textbook describes both laminar and turbulent flames, addresses the problem of flame-wall interaction, and presents a series of theoretical tools used to study the coupling phenomena between combustion and acoustics. The second edition incorporates recent advances in unsteady simulation methods,

Direct Numerical Simulation for Turbulent Reacting Flows

Author : Thierry Baritaud
Publisher : Editions TECHNIP
ISBN 13 : 9782710806981
Total Pages : 328 pages
Book Rating : 4.8/5 (69 download)

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Book Synopsis Direct Numerical Simulation for Turbulent Reacting Flows by : Thierry Baritaud

Download or read book Direct Numerical Simulation for Turbulent Reacting Flows written by Thierry Baritaud and published by Editions TECHNIP. This book was released on 1996 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: Description of accurate boundary conditions for the simulation of reactive flows. Parallel direct numerical simulation of turbulent reactive flow. Flame-wall interaction and heat flux modelling in turbulent channel flow. A numerical study of laminar flame wall interaction with detailed chemistry: wall temperature effects. Modeling and simulation of turbulent flame kernel evolution. Experimental and theoretical analysis of flame surface density modelling for premixed turbulent combustion. Gradient and counter-gradient transport in turbulent premixed flames. Direct numerical simulation of turbulent flames with complex chemical kinetics. Effects of curvature and unsteadiness in diffusion flames. Implications for turbulent diffusion combustion. Numerical simulations of autoignition in turbulent mixing flows. Stabilization processes of diffusion flames. References.

Unsteady Combustor Physics

Author : Tim C. Lieuwen
Publisher : Cambridge University Press
ISBN 13 : 1139576836
Total Pages : 427 pages
Book Rating : 4.1/5 (395 download)

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Book Synopsis Unsteady Combustor Physics by : Tim C. Lieuwen

Download or read book Unsteady Combustor Physics written by Tim C. Lieuwen and published by Cambridge University Press. This book was released on 2012-08-27 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developing clean, sustainable energy systems is a pre-eminent issue of our time. Most projections indicate that combustion-based energy conversion systems will continue to be the predominant approach for the majority of our energy usage. Unsteady combustor issues present the key challenge associated with the development of clean, high-efficiency combustion systems such as those used for power generation, heating or propulsion applications. This comprehensive study is unique, treating the subject in a systematic manner. Although this book focuses on unsteady combusting flows, it places particular emphasis on the system dynamics that occur at the intersection of the combustion, fluid mechanics and acoustic disciplines. Individuals with a background in fluid mechanics and combustion will find this book to be an incomparable study that synthesises these fields into a coherent understanding of the intrinsically unsteady processes in combustors.

Government Reports Annual Index

Author :
Publisher :
ISBN 13 :
Total Pages : 1096 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Government Reports Annual Index by :

Download or read book Government Reports Annual Index written by and published by . This book was released on 1995 with total page 1096 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

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.

An Experimental Investigation of Two-dimensional Flame-vortex Interactions

Author : Tsun-Wai Gary Yip
Publisher :
ISBN 13 :
Total Pages : 198 pages
Book Rating : 4.:/5 (128 download)

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Book Synopsis An Experimental Investigation of Two-dimensional Flame-vortex Interactions by : Tsun-Wai Gary Yip

Download or read book An Experimental Investigation of Two-dimensional Flame-vortex Interactions written by Tsun-Wai Gary Yip and published by . This book was released on 1984 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Combustion Phenomena

Author : Jozef Jarosinski
Publisher : CRC Press
ISBN 13 : 0849384095
Total Pages : 236 pages
Book Rating : 4.8/5 (493 download)

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Book Synopsis Combustion Phenomena by : Jozef Jarosinski

Download or read book Combustion Phenomena written by Jozef Jarosinski and published by CRC Press. This book was released on 2009-02-12 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extensively using experimental and numerical illustrations, CombustionPhenomena: Selected Mechanisms of Flame Formation, Propagation, and Extinction provides a comprehensive survey of the fundamental processes of flame formation, propagation, and extinction. Taking you through the stages of combustion, leading experts visually display, mathematically explain, and clearly theorize on important physical topics of combustion. After a historical introduction to the field, they discuss combustion chemistry, flammability limits, and spark ignition. They also study counterflow twin-flame configuration, flame in a vortex core, the propagation characteristics of edge flames, instabilities, and tulip flames. In addition, the book describes flame extinction in narrow channels, global quenching of premixed flames by turbulence, counterflow premixed flame extinction limits, the interaction of flames with fluids in rotating vessels, and turbulent flames. The final chapter explores diffusion flames as well as combustion in spark- and compression-ignition engines. It also examines the transition from deflagration to detonation, along with the detonation wave structure. With downloadable resources of images that beautifully illustrate a range of combustion phenomena, this book facilitates a practical understanding of the processes occurring in the conception, spread, and extinguishment of a flame. It will help you on your way to finding solutions to real issues encountered in transportation, power generation, industrial processes, chemical engineering, and fire and explosion hazards.

Optical Diagnostics for Fluids/heat/combustion and Photomechanics for Solids

Author : Soyoung S. Cha
Publisher : SPIE-International Society for Optical Engineering
ISBN 13 :
Total Pages : 426 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Optical Diagnostics for Fluids/heat/combustion and Photomechanics for Solids by : Soyoung S. Cha

Download or read book Optical Diagnostics for Fluids/heat/combustion and Photomechanics for Solids written by Soyoung S. Cha and published by SPIE-International Society for Optical Engineering. This book was released on 1999 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Dynamics of Heterogeneous Combustion and Reacting Systems

Author : A. L. Kuhl
Publisher : AIAA
ISBN 13 : 9781600864063
Total Pages : 474 pages
Book Rating : 4.8/5 (64 download)

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Book Synopsis Dynamics of Heterogeneous Combustion and Reacting Systems by : A. L. Kuhl

Download or read book Dynamics of Heterogeneous Combustion and Reacting Systems written by A. L. Kuhl and published by AIAA. This book was released on 1993 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Flows of Reactive Fluids

Author : Roger Prud'homme
Publisher : Springer Science & Business Media
ISBN 13 : 0817646590
Total Pages : 492 pages
Book Rating : 4.8/5 (176 download)

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Book Synopsis Flows of Reactive Fluids by : Roger Prud'homme

Download or read book Flows of Reactive Fluids written by Roger Prud'homme and published by Springer Science & Business Media. This book was released on 2010-07-15 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: The modeling of reactive flows has progressed mainly with advances in aerospace, which gave birth to a new science called aerothermochemistry, as well as through developments in chemical and process engineering. This work examines basic concepts and methods necessary to study reactive flows and transfer phenomena in areas such as fluid mechanics, thermodynamics, and chemistry. The book presents tools of interest to graduate students, researchers in mathematical physics, and engineers who wish to investigate problems of reactive flows. Portions of the text may be used in courses on the physics of liquids or in seminars on mechanics.

Regimes of Non-Premixed Flame-Vortex Interactions

Author :
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Regimes of Non-Premixed Flame-Vortex Interactions by :

Download or read book Regimes of Non-Premixed Flame-Vortex Interactions written by and published by . This book was released on 2000 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed studies of flame-vortex interactions are extremely valuable to improve our understanding of turbulent combustion regimes. Combined experimental and numerical studies have already been performed in the premixed case during previous investigations. Therefore, we decided to carry out a detailed experimental investigation on the regimes observed during interaction of a vortex ring and a non-premixed, diluted, hydrogen/air, laminar counterflow flame. To obtain the needed information, several optical diagnostic techniques have been used, in particular, planar laser-induced fluorescence (PLIF) of acetone to quantify vortex structure and speed, simultaneous OH PLIF and Rayleigh measurements, and simultaneous OH PLIF and particle-imaging velocimetry (PIV) measurements. A post-processing of the results combined with direct simulations using detailed chemistry and transport models to check the quality of the postprocessing procedures has led to the construction of a spectral interaction diagram. Eight interaction types were found, emphasizing the relative importance of competing physical phenomena such as straining, curvature, wrinkling, roll-up, and extinction. In particular, we observe two different types of extinction, one due to the combined action of curvature and straining, and the other purely due to straining effects. It was also observed that many vortices are too small or dissipate too rapidly to influence the flame. In other cases, the vortex ring can lead to the formation of pockets of oxidizer burning in the fuel part of the domain. These regimes and the limits between them have important implications for the modeling of turbulent non-premixed combustion.

New Research on Hazardous Materials

Author : Phillip B. Warey
Publisher : Nova Publishers
ISBN 13 : 9781600212567
Total Pages : 444 pages
Book Rating : 4.2/5 (125 download)

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Book Synopsis New Research on Hazardous Materials by : Phillip B. Warey

Download or read book New Research on Hazardous Materials written by Phillip B. Warey and published by Nova Publishers. This book was released on 2007 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hazardous waste is a waste with properties that make it dangerous or potentially harmful to human health or the environment. Hazardous waste generally exhibits one or more of these characteristics: ignitability, corrosivity, reactivity or toxicity. The universe of hazardous wastes is large and diverse. Hazardous wastes can be liquids, solids, contained gases, or sludges. They can be the by-products of manufacturing processes or simply discarded commercial products, like cleaning fluids or pesticides. One major type is radioactive waste. This book brings together the latest research in this diverse field.