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Author : Fumiaki Takahashi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Numerical Experiments on the Local Extinction of Jet Diffusion Flames written by Fumiaki Takahashi and published by . This book was released on 1996 with total page 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 : Thomas H. Cochran
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (31 download)
Download or read book Effects of Gravity on Laminar Gas Jet Diffusion Flames written by Thomas H. Cochran and published by . This book was released on 1970 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental program was conducted to study the burning of laminar gas jet diffusion flames in a zero-gravity environment. The tests were conducted in the Lewis Research Center 2.2-Second Zero-Gravity Facility. The photographic results indicated that a sudden decrease in gravity level from 1 to 0 effected an immediate reduction in the length of the flame. Continued time in zero gravity resulted in the flame expanding away from the burner until extinguishment appeared to occur. Nondimensionalization of the governing flow equation yielded the parameters used to correlate the buoyancy effects.
Author : Anjan Ray
Publisher :
ISBN 13 :
Total Pages : 448 pages
Book Rating : 4.3/5 (129 download)
Download or read book Theoretical and Numerical Investigation of Radiataive Extinction of Diffusion Flames written by Anjan Ray and published by . This book was released on 1996 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anthony Hamins
Publisher :
ISBN 13 :
Total Pages : 552 pages
Book Rating : 4.:/5 (318 download)
Download or read book The Structure and Extinction of Diffusion Flames written by Anthony Hamins and published by . This book was released on 1985 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Fumiaki Takahashi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book A Numerical Investigation of the Stabilizing Mechanism of Methane Jet Diffusion Flames written by Fumiaki Takahashi and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anjan Ray
Publisher :
ISBN 13 : 9780591135442
Total Pages : 204 pages
Book Rating : 4.1/5 (354 download)
Download or read book Theoretical and Numerical Investigation of Radiative Extinction of Diffusion Flames written by Anjan Ray and published by . This book was released on 1996 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. Johari
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Experiments on Impulsively-started Jet Diffusion Flames written by H. Johari and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. F. Chaiken
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (227 download)
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).
Author : Natver Kasanji Patel
Publisher :
ISBN 13 :
Total Pages : 192 pages
Book Rating : 4.:/5 (32 download)
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:
Author :
Publisher :
ISBN 13 :
Total Pages : 402 pages
Book Rating : 4.:/5 (317 download)
Download or read book Effects of Buoyancy on Gas Jet Diffusion Flames written by and published by . This book was released on 1993 with total page 402 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 : Gary Paul Garbinski
Publisher :
ISBN 13 :
Total Pages : 270 pages
Book Rating : 4.:/5 (35 download)
Download or read book A Numerical Study of Ignition and Extinction Phenomena of Counterflow Diffusion Flames written by Gary Paul Garbinski and published by . This book was released on 1994 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ala Rafat Qubbaj
Publisher :
ISBN 13 :
Total Pages : 490 pages
Book Rating : 4.:/5 (464 download)
Download or read book An Experimental and Numerical Study of Gas Jet Diffusion Flames Enveloped by a Cascade of Venturis written by Ala Rafat Qubbaj and published by . This book was released on 1998 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Carolyn R. Kaplan
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Direct Numerical Simulations of Stabilized Lifted Jet Diffusion Flames written by Carolyn R. Kaplan and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download An Experimental and Analytical Examination of Jet Diffusion Flames in Non-quiescent Environments of Fuel and Air [microform] PDF Online Free](https://books.google.com/books/content/images/frontcover/gs_dSgAACAAJ?fife=w200-h370)
Author : Mohammed Golam Kibrya
Publisher : National Library of Canada
ISBN 13 :
Total Pages : 660 pages
Book Rating : 4.:/5 (15 download)
Download or read book An Experimental and Analytical Examination of Jet Diffusion Flames in Non-quiescent Environments of Fuel and Air [microform] written by Mohammed Golam Kibrya and published by National Library of Canada. This book was released on 1987 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James Stephen Kistler
Publisher :
ISBN 13 :
Total Pages : 210 pages
Book Rating : 4.:/5 (329 download)
Download or read book An Experimental Investigation on the Extinction of Counterflow Diffusion Flames in an Oscillating Flow Field written by James Stephen Kistler and published by . This book was released on 1995 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
