A Computational Study of One-dimensional, Unsteady Diffusion Flames PDF Download
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Author: Yousik Hong
Publisher:
ISBN:
Category : Combustion engineering
Languages : en
Pages : 262
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Author: Yousik Hong
Publisher:
ISBN:
Category : Combustion engineering
Languages : en
Pages : 262
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Book Description
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781723906619
Category :
Languages : en
Pages : 66
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Book Description
An experimental apparatus for the examination of a planar, virtually strain-rate-free diffusion flame in microgravity has been designed and fabricated. Such a diffusion flame is characterized by relatively large spatial scale and high symmetry (to facilitate probing), and by relatively long fluid-residence time (to facilitate investigation of rates associated with sooting phenomena). Within the squat rectangular apparatus, with impervious, noncatalytic isothermal walls of stainless steel, a thin metallic splitter plate subdivides the contents into half-volumes. One half-volume initially contains fuel vapor diluted with an inert gas, and the other, oxidizer diluted with another inert gas-so that the two domains have equal pressure, density, and temperature. As the separator is removed, by translation in its own plane, through a tightly fitting slit in one side wall, a line ignitor in the opposite side wall initiates a triple-flame propagation across the narrow layer of combustible mixture formed near midheight in the chamber. The planar diffusion flame so emplaced is quickly disrupted in earth gravity. In microgravity, the planar flame persists, and travels ultimately into the half-volume containing the stoichiometrically deficient reactant; the flame eventually becomes extinguished owing to reactant depletion and heat loss to the walls.Fendell, Francis and Rungaldier, HaraldGlenn Research CenterFLAME PROPAGATION; COMBUSTION; DIFFUSION FLAMES; MICROGRAVITY; THIN PLATES; BURNOUT; DEPLETION; STAINLESS STEELS; SYMMETRY; STRAIN RATE; IGNITION
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721035113
Category :
Languages : en
Pages : 64
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Book Description
An experimental apparatus for the examination of a planar, virtually strain-rate-free diffusion flame in microgravity has been designed and fabricated. Such a diffusion flame is characterized by relatively large spatial scale and high symmetry (to facilitate probing), and by relatively long fluid-residence time (to facilitate investigation of rates associated with sooting phenomena). Within the squat rectangular apparatus, with impervious, noncatalytic isothermal walls of stainless steel, a thin metallic splitter plate subdivides the contents into half-volumes. One half-volume initially contains fuel vapor diluted with an inert gas, and the other, oxidizer diluted with another inert gas-so that the two domains have equal pressure, density, and temperature. As the separator is removed, by translation in its own plane, through a tightly fitting slit in one side wall, a line ignitor in the opposite side wall initiates a triple-flame propagation across the narrow layer of combustible mixture formed near midheight in the chamber. The planar diffusion flame so emplaced is quickly disrupted in earth gravity. In microgravity, the planar flame persists, and travels ultimately into the half-volume containing the stoichiometrically deficient reactant; the flame eventually becomes extinguished owing to reactant depletion and heat loss to the walls.Fendell, Francis and Rungaldier, HaraldGlenn Research CenterFLAME PROPAGATION; COMBUSTION; DIFFUSION FLAMES; MICROGRAVITY; THIN PLATES; BURNOUT; DEPLETION; STAINLESS STEELS; SYMMETRY; STRAIN RATE; IGNITION
Author: J Barr (Deckker, B. E. L, Taylor, W. L.)
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Fernando de Souza Costa
Publisher:
ISBN:
Category :
Languages : en
Pages : 358
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Author: V. R. Katta
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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This report presents time-dependent axisymmetric numerical simulations of an unsteady diffusion flame formed between a jet and a coflowing air stream. The computations include the effects of convection, molecular diffusion, thermal conduction, viscosity, gravitational forces, and chemical reactions with energy release. Previous work has shown that viscous effects are important in these flames and, therefore, all of the viscous terms in the compressible Navier-Stokes equations are included. In addition, the resolution is increased so that the large, vortical structures in the coflowing gas are resolved and the boundary conditions are improved so that the velocity field near the jet is more realistic. Computations with and without chemical reactions and heat release, and with and without gravity, are compared. Gravitational effects are insignificant in the nonreacting jet but in the reacting jet gravity produced the relatively low-frequency instabilities typically associated with flame flicker. Kelvin-Helmholtz instabilities develop in the region between the high-velocity and low-velocity fluid when there are no chemical reactions, but heat release dampens these instabilities to produce a mixing region which is almost steady in time.
Author: K.J. Laskey
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: H. G. Im
Publisher:
ISBN:
Category :
Languages : en
Pages :
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