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Author : Derek Arthur Scholefield
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (118 download)
Download or read book A Study of the Structure and Stability of Diffusion Flames written by Derek Arthur Scholefield and published by . This book was released on 1950 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : D. A. Scholefield
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (112 download)
Download or read book The Structure and Stability of Diffusion Flames written by D. A. Scholefield and published by . This book was released on 1949 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John Barr
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (298 download)
Download or read book The Structure and Stability of Diffusion Flames written by John Barr and published by . This book was released on 1962 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jagannath Ramchandra Nanduri
Publisher :
ISBN 13 :
Total Pages : 223 pages
Book Rating : 4.:/5 (631 download)
Download or read book A Computational Study of the Structure, Stability, Dynamics, and Response of Low Stretch Diffusion Flame written by Jagannath Ramchandra Nanduri and published by . This book was released on 2006 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Graham Christopher Fleming
Publisher :
ISBN 13 :
Total Pages : 300 pages
Book Rating : 4.:/5 (436 download)
Download or read book Structure and Stability of Buoyant Diffusion Flames written by Graham Christopher Fleming and published by . This book was released on 1982 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sally Ann Cheatham
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (373 download)
Download or read book On the Structure and Stability of Diffusion Flames written by Sally Ann Cheatham and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Diffusion flames are flames in which fuel and oxidant, initially separate, come together to react chemically in a relatively thin combustion zone. Asymptotic methods, supplemented by numerical computation, are used to analyze the structure and dynamical properties of such flames. Attention is first focused on diffusion flames in arbitrary fluid flows for general fuel and oxidant Lewis numbers, in which the combustion is complete or nearly complete. Thus the limit of large Damkohler number and large activation energy is considered. The resulting mathematical formulation consists of a free boundary problem, with the flame as the free boundary. Such a treatment greatly simplifies the governing system of equations, and provides a framework for the analysis of the flame structure as well as its dynamical properties. The stability of a planar flame is next considered, with attention focused on diffusional-thermal effects. A dispersion relation is obtained, which relates the growth parameter and wavenumber of disturbances to the fuel and oxidant Lewis numbers, supply temperatures, and supply concentrations. Analysis of the dispersion relations indicates that instability corresponding to cellularity of the flame may occur for lean flames under near extinction conditions when the Lewis numbers of fuel and oxidant are sufficiently low. The asymptotic model is also used to identify conditions under which flame extinction occurs. In particular, the burning characteristics of a dilute spray diffusion flame have been examined. The presence of fuel droplets in the fuel supply is shown to alter the extinction characteristics of the flame. The onset of oscillations in the spherical diffusion flame surrounding a fuel droplet is also considered. Motivated by recent microgravity candle flame experiments, the constraint of a weak oxidant environment is imposed. A linear stability analysis indicates that oscillations may indeed result when radiative heat losses and the Lewis numbers of fuel and oxidant are sufficiently large. Estimates for the critical conditions are given, along with a prediction of the resulting frequency of oscillation. A weakly non-linear analysis is then used to more fully investigate the transition to an oscillatory burning state.
Author : Kezhong Jia
Publisher :
ISBN 13 :
Total Pages : 268 pages
Book Rating : 4.:/5 (148 download)
Download or read book The Structure and Stability of Enclosed Laminar Jet Diffusion Flames written by Kezhong Jia and published by . This book was released on 1999 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nancy Papanikolaou
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (122 download)
Download or read book An Experimental Investigation of the Flow Structure and Stability Limits of Jet Diffusion Flames in a Co-flowing Oxidizing Stream written by Nancy Papanikolaou and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Graham Christopher Fleming
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (353 download)
Download or read book Structure and Stability of Bouyant Diffusion Flames written by Graham Christopher Fleming and published by . This book was released on 1982 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Suk Ho Chung
Publisher :
ISBN 13 :
Total Pages : 242 pages
Book Rating : 4.:/5 (259 download)
Download or read book Studies on the structure of diffusion flames written by Suk Ho Chung and published by . This book was released on 1983 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John Barr
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.3/5 ( download)
Download or read book Diffusion Flames in the Laboratory written by John Barr and published by . This book was released on 1954 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M.Y. Hussaini
Publisher : Springer Science & Business Media
ISBN 13 : 1461228840
Total Pages : 668 pages
Book Rating : 4.4/5 (612 download)
Download or read book Major Research Topics in Combustion written by M.Y. Hussaini and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Institute for Computer Applications in Science and Engineer ing (ICASE) and NASA Langley Research Center (LaRC) brought together on October 2-4, 1989 experts in the various areas of com bustion with a view to expose them to some combustion problems of technological interest to LaRC and possibly foster interaction with the academic community in these research areas. The top ics chosen for this purpose were flame structure, flame stability, flame holding/extinction, chemical kinetics, turbulence-kinetics in teraction, transition to detonation, and reacting free shear layers. The lead paper set the stage by discussing the status and issues of supersonic combustion relevant to scramjet engine. Then the ex perts were called upon i) to review the current status of knowledge in the aforementioned ;:I. reas, ii) to focus on how this knowledge can be extended and applied to high-speed combustion, and iii) to suggest future directions of research in these areas. Each topic was then dealt with in a position paper followed by formal discussion papers and a general discussion involving the participants. The position papers discussed the state-of-the-art with an emphasis on key issues that needed to be resolved in the near future. The discussion papers crit ically examined these issues and filled in any lacunae therein. The edited versions of the general discussions in the form of questions from the audience and answers from the speakers are included wher ever possible to give the reader the flavor of the lively interactions that took place.
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 : F. Takahashi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Effects of Swirl on the Stability and Turbulent Structure of Jet Diffusion Flames written by F. Takahashi and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jan H. Andersen
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (245 download)
Download or read book An Investigation of the Structure of Turbulent Diffusion Flames written by Jan H. Andersen and published by . This book was released on 1991 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722457822
Total Pages : 26 pages
Book Rating : 4.4/5 (578 download)
Download or read book On the Structure of Gaseous Confined Laminar Diffusion Flames written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-09 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure and characteristics of gaseous confined laminar diffusion flames are investigated by numerically solving the time-dependent two-dimensional axisymmetric conservation equations. The numerical model accounts for the important chemical and physical processes involved, including axial diffusion, viscous effects, radial convection, and finite-rate chemistry. The numerical results clearly show that the flame has a finite thickness and leakage of fuel vapor into the flame zone is possible. The effect of heat release is found to induce some radial flow. Predicted flame shape and dimensions are compared to the classical Burke-Schumann flame. The numerically calculated flame is observed to be about 15 percent taller and 5 percent narrower than that of the Burke-Schumann solution under the same conditions. Mawid, M. A. and Bulzan, D. L. and Aggarwal, S. K. Glenn Research Center RTOP 505-62-21...
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722810016
Total Pages : 30 pages
Book Rating : 4.8/5 (1 download)
Download or read book Structure of Confined Laminar Spray Diffusion Flames written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-11 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure of confined laminar spray diffusion flames is investigated numerically by solving the gas-phase conservation equations for mass species, continuity, momentum, and energy and the liquid-phase equations for droplet position, velocity, size, and temperature. A one-step global reaction scheme along with six equilibrium reactions are employed to model the flame chemistry. Monodisperse as well as polydisperse sprays are considered. The numerical results demonstrate that liquid spray flames substantially differ from gaseous flames in their structure, i.e., temperature, concentration, and velocity fields, shape, and dimensions under the same conditions. Spray flames are predicted to be taller and narrower than their counterpart gaseous ones and their shapes are almost cylindrical. This is in agreement with experimental observations. The numerical computations also show that the use of the equilibrium reactions with the one-step reaction scheme decreases the flame temperature compared to the one-step reaction scheme without the equilibrium reactions and more importantly increases the surface area of the flame zone due to a phenomenon termed 'equilibrium broadening.' The spray flames also possess a finite thickness with minimal overlap of the fuel and oxygen species. A case for which a fuel-mixture consisting of 20 to 80 percent gas-liquid by mass is introduced into the combustor is also investigated and compared with predictions using only gaseous or liquid fuel. Mawid, M. A. and Bulzan, D. L. and Aggarwal, S. K. Glenn Research Center RTOP 505-62-21...
