Download or read book Studies of Opposed Jet Diffusion Flames written by Natver Kasanji Patel and published by . This book was released on 1973 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Opposed Jet Turbulent Diffusion Flames written by Lawrence Talbot and published by . This book was released on 1990 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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:

Download or read book Hydrocarbon atomic Oxygen Opposed Jet Diffusion Flame Studies written by Vinay L. Tejani and published by . This book was released on 1972 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On the Extinction of Opposed jet Diffusion Flames a Physical Criterion for Extinction written by R. F. Chaiken and published by . This book was released on 1965 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A physical criterion for the extinction of opposed-jet diffusion flames is presented. This criterion, when used in conjunction with the Spalding Theory of mixing in opposed-gas jets, enables the apparent flame strength to be related to (1) the effective maximum chemical reaction rate in the opposed-jet flame, and (2) the laminar flame speed of an equivalent pre-mixed diffusion flame. The derived relationships differ somewhat from similar relationships given by Spalding's earlier theoretical treatment of the phenomena in the thin-flame approximation, but do yield quantitatively similar results when compared with experimental data reported for opposed-jet diffusion flames involving oxidation of simple hydrocarbons and ammonia. (Author).

Download or read book Burner Stabilities of Jet Diffusion Flames written by James Phillip Seaba and published by . This book was released on 1990 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: The near field lift-off phenomena associated with jet diffusion flames were investigated. Lift-off is defined as the instant when the luminous flame zone detaches from the burner exit, stabilizing itself downstream. The lift-off of the jet diffusion flames were studied using a fuel jet centered in a large coflowing air annulus. Fuels used consisted of methane and propane. The fuels are diluted with nitrogen, argon, and helium. Annulus, diluted fuel, and external nozzle geometry effects are studied for the jet diffusion flame. The jet diffusion flame is sensitive to the annulus velocity, the lift-off velocity decreasing with increasing annular velocity. Lift-off velocity decreases as dilution concentrations of the fuel jet increase. The external geometry effects influence the lift-off velocity, especially at higher annular flow rates. Two theories have explained the lift-off of jet diffusion flames. The locally premixed theory which assumes that the fuel and oxidant are fully premixed prior to combustion. The lift-off of the flame zone occurs due to the convective velocity of the premixed reactants exceeding the local flame speed. The second theory, the laminar flamelet model, states that the diffusion of reactants into the flame zone exceeds the chemical reaction rate, causing the flame to extinguish at the flame base, lifting the flame from the nozzle to a position downstream. The two models were evaluated by the different lift-off velocities produced by annulus and diluent effects. Laser Doppler anemometry (LDA) was used to characterize the flow field at and near the base of the jet diffusion flame. The local straining rate across the flame was approximated by the gradient of the mean radial velocity in the radial direction for the pure and diluted methane conditions. The straining rate was in qualitative agreement with that reported in the literature for counter-flow methane diffusion flames near extinction.

Download or read book Study of Opposed Jet Diffusion Flame written by Pravin V. Ajmera and published by . This book was released on 1965 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of Opposed jet Diffusion Flames Under Impressed Electric Fields written by Bernard J. Rezy and published by . This book was released on with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Opposed Jet Burner Studies of Effects of CO CO2 and N2 Air contaminants on Hydrogen air Diffusion Flames written by Rosemary Guerra and published by . This book was released on 1987 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of the Temperature Field of an Opposed jet Diffusion Flame Subjected to an Electric Field written by Serge Thillard and published by . This book was released on with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Temperature Study of H2 air Opposed Jet Diffusion Flames written by S. Yeralan and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pollutant Formation in Flat Laminar Opposed Jet Diffusion Flames written by Werner Artur Hahn and published by . This book was released on 1979 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Cleaner Combustion written by Derek Dunn-Rankin and published by MDPI. This book was released on 2019-11-20 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides unique views of combustion from many technical and international research perspectives. Combustion science is often considered from its negative environmental impact, where we find, instead, that energy release from fuels of all kinds have promoted human endeavor throughout history. This volume tries to capture some of these positive features by showing a range of work examining unusual fuels and controlling the pollution from them.

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:

Download or read book Microgravity Combustion written by Howard D. Ross and published by Elsevier. This book was released on 2001-09-03 with total page 601 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an introduction to understanding combustion, the burning of a substance that produces heat and often light, in microgravity environments-i.e., environments with very low gravity such as outer space. Readers are presented with a compilation of worldwide findings from fifteen years of research and experimental tests in various low-gravity environments, including drop towers, aircraft, and space.Microgravity Combustion is unique in that no other book reviews low- gravity combustion research in such a comprehensive manner. It provides an excellent introduction for those researching in the fields of combustion, aerospace, and fluid and thermal sciences. * An introduction to the progress made in understanding combustion in a microgravity environment* Experimental, theoretical and computational findings of current combustion research* Tutorial concepts, such as scaling analysis* Worldwide microgravity research findings