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Author : Andrea Ciani
Publisher :
ISBN 13 :
Total Pages : 108 pages
Book Rating : 4.:/5 (428 download)
Download or read book Hydrogen and Methane Edge and Diffusion Flames in Opposed Jet Configurations written by Andrea Ciani and published by . This book was released on 2006 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher : DIANE Publishing
ISBN 13 : 1428994971
Total Pages : 84 pages
Book Rating : 4.4/5 (289 download)
Download or read book Analysis of opposed jet hydrogen-air counter flow diffusion flame written by and published by DIANE Publishing. This book was released on with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (227 download)
Download or read book Two-Dimensional Direct Numerical Simulation of Opposed-Jet Hydrogen/Air Flames: Transition From a Diffusion to an Edge Flame written by and published by . This book was released on 2000 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: In an opposed-jet diffusion flame experiment, under certain conditions, after the extinction of the diffusion flame, an edge flame can be obtained. It was reported recently in a numerical and an experimental work and is responsible for an interesting transition between two distinct burning flames (multiple solutions). Motivated by our previous numerical results, obtained with simplified kinetics and some recently reported experimental data, we performed direct numerical simulations of this transition to investigate the underlying physical mechanisms. The appearance of an edge flame after the extinction of the diffusion flame, the hysteresis reported in the experiments, and the existence of multiple vigorously burning flames at identical conditions are all captured by our simulations. Our numerical results show that, in the absence of an inert coflow curtain, when the diffusion flame disk is extinguished, an edge flame forms and propagates in the mixing layer. After the formation of this edge flame, even when the applied strain rate is reduced to the initial subcritical value, the diffusion flame disk does not reappear, because the local fluid velocity still exceeds the propagation speed of the edge flame. This hysteresis has significant implications in the common submodel that utilizes the strain rate as a parameter to determine local reignition in flamelet models; it indicates that a subcritical strain rate is not a sufficient condition for the reignition of a diffusion flame. Further investigation of this phenomenon is clearly needed to refine submodels of local extinction and reignition in the flamelet models for turbulent diffusion flames. The opposed-jet configuration provides a convenient platform to analyze edge flames which are stabilized aerodynamically in a two-dimensional geometry, thus making matching two-dimensional direct numerical simulations effective.
Author : Fred Leslie Jones
Publisher :
ISBN 13 :
Total Pages : 322 pages
Book Rating : 4.:/5 (786 download)
Download or read book A Simulation of the Opposed-jet Methane-nitrogen Oxygen Diffusion Flame Under the Influence of an Electric Field written by Fred Leslie Jones and published by . This book was released on with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kenneth Kuan-yun Kuo
Publisher : John Wiley & Sons
ISBN 13 : 0470226226
Total Pages : 914 pages
Book Rating : 4.4/5 (72 download)
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.
Author : Raymond Friedman
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (781 download)
Download or read book Inhibition of Opposed-jet Methane-air Diffusion Flames. The Effects of Alkali Metal Vapors and Organic Halides written by Raymond Friedman and published by . This book was released on 1962 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flame strengths of opposed-jet laminar methane-air diffusion flames were measured by the technique of Potter et al, with additives in the methane stream. Organic bromides and chlorides were revealed as inhibitors by this technique, with relative effectiveness of the various inhibitors in line with previously reported results for premixed flames. Introduction of potassium vapor in the fuel stream up to molar K/CH4 ratios of 1/16.4 gave no inhibiting effect, although bromine compounds at this level were quite powerful inhibitors. The mechanism of inhibition by alkali metal salts with oxygen-containing anions is discussed; it is proposed that gaseous KOH removes H and OH radicals via KOH + H to HOH + K and KOH + OH to HOH + KO. The mechanism is consistent with all known facts including the present results.
Author : K. C. Hwang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Characteristics of Hydrogen-air Opposed Jet Laminar Diffusion Flames at Extinction Limit written by K. C. Hwang and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : K. C. Hwang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Two-dimensional Simulation of Hydrogen-air Opposed Jet Diffusion Flame written by K. C. Hwang and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Y. H. Ho (mechanical engineer.)
Publisher :
ISBN 13 :
Total Pages : 73 pages
Book Rating : 4.:/5 (261 download)
Download or read book Analysis of Opposed Jet Hydrogen-air Counter Flow Diffusion Flame written by Y. H. Ho (mechanical engineer.) and published by . This book was released on 1989 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert J. Bacigalupi
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (31 download)
Download or read book Blowoff of Propane and Hydrogen Diffusion Flames at High Mach Number, Ramjet Conditions written by Robert J. Bacigalupi and published by . This book was released on 1959 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Studies on the Leading Edge and Local Extinction in Lifted-Jet Diffusion Flames written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Several researchers have examined the concept of flame stability and there has been little agreement regarding the reasons governing this phenomenon. The experiments described within were devised to establish the dominating stabilization mechanism in lifted flames. Specifically, the flame base of lifted methane-jet diffusion flames were examined through the use of various combinations of synchronized laser-based techniques involving particle image velocimetry (PIV), planar laser-induced fluorescence (PLIF), and Rayleigh scattering. Results indicate the presence of a structure termed a flame. Results involving the gradient in the Rayleigh signal across the flame base, in addition to two-shot CH-PLIF interpretations support the leading-edge flame as a primary stabilization mechanism. The extent of premixing upstream of the flame base has been a major source of disagreement in the past. The simultaneous Rayleigh and CH-PLIF images indicate the base of the lifted flame lies in a region that is within the flammability limits of methane burning in air. Furthermore, the average velocity at the stabilization point is 1.18 m/s (as determined from the simultaneous CH-PLIF and PIV investigation); this value is comparable to three times the laminar burning velocity of methane (~ 3S), thereby supporting previous numerical triple flame simulations. Results from the joint two-shot CH-PLIF and PIV technique show that the flame base velocity is independent of the flow conditions when the flame is stationary during the time separation of the CH-PLIF pulses. Specifically, flames with Re flow conditions. Finally, regions of local extinction -- as indicated by openings in the CH profiles -- were examined. Results from four experiments (simultaneous CH-PLIF and PIV, simultaneous CH-PLIF and OH-PLIF, simultaneous CH-PLIF and Rayleigh scattering, and simultaneous two-shot CH-PLIF and PIV) provide complementary information regarding the role of large-scale fuel vortices in initiat.
Author : K. C. Hwang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Parametric Study of Moderately Strained Hydrogen-air Opposed Jet Laminar Diffusion Flames written by K. C. Hwang and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781792689437
Total Pages : 30 pages
Book Rating : 4.6/5 (894 download)
Download or read book Modeling of Hydrogen-Air Diffusion Flame written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-12-28 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Work performed during the first six months of the project duration for NASA Grant (NAG-1-861) is reported. An analytical and computational study of opposed jet diffusion flame for the purpose of understanding the effects of contaminants in the reactants and thermal diffusion of light species on extinction and reignition of diffusion flames is in progress. The methodologies attempted so far are described. Isaac, K. M. NASA-CR-181357, NAS 1.26:181357 NAG1-861...
Author : Fumiaki Takahashi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Stability-limit Predictions of Methane Jet Diffusion Flames written by Fumiaki Takahashi and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (227 download)
Download or read book Opposed Jet Turbulent Diffusion Flames written by and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Hydrogen-Helium mixture was chosen to investigate the structure of a counterflow diffusion flame. Reacting and non reacting conditions were studied at the same Reynolds number. To study the reaction zone structure, high speed tomography based on Mie scattering was employed using a copper vapor laser and a Fastax high speed camera. LDV measurements were also obtained. Different seeding techniques were used to visualize both the turbulent air and fuel jets. The tomographic records were digitized and recorded in a digital computer for statistical treatment. Significant differences in the wrinkle scales between the reacting and non reacting flows were found. A fractal statistical analysis of the tomography records was done to quantify these differences. Seeding of both fuel and air jets provided a mean for the evaluation of the reaction zone thickness. The strain of the reaction zone was obtained from the time resolved tomographic records. Local flame extinction and reignition were observed for different H2/Helium fuel mixtures. Keywords: Turbulent diffusion flames, Rayleigh scattering.
Author :
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.3/5 (91 download)
Download or read book Hydrogen Flare Stack Diffusion Flames written by and published by . This book was released on 1970 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (88 download)
Download or read book Experimental and Modeling Studies of the Micro-structures of Opposed Flow Diffusion Flames: Methane written by and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
