Structure and Extinction of Spherical Diffusion Flames in Microgravity PDF Download
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Author: Karl J. Santa
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 92
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Book Description
Author: Karl J. Santa
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 92
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Book Description
Author: Kristine Renee Mills
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Assuming that the activation energy is large, we develop an asymptotic theory that treats the flame as a surface, on either side of which the chemical reaction rate is negligibly small. By examining the flame structure, we derive an explicit dependence of the combustion parameters on the flame temperature and reactants' leakage through the flame. A new element of this work is that the Lewis numbers associated with the fuel and oxidant are kept arbitrary, and that additional factors influencing the flame structure are included.
Author: Sally Ann Cheatham
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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: S. D. Tse
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Sean Won S. Yoo
Publisher:
ISBN:
Category :
Languages : en
Pages : 556
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Author:
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 546
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Author: Howard D. Ross
Publisher: Elsevier
ISBN: 0080549977
Category : Technology & Engineering
Languages : en
Pages : 601
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Book Description
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
Author: Melissa Kay Chernovsky
Publisher:
ISBN:
Category :
Languages : en
Pages : 402
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Author:
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 490
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Author: Tianying Xia
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 50
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Book Description
