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Wind-aided flame spread over thick solids
Combustion and Flame, 1991Abstract This study theoretically analyzes flame spread over thick solid fuels (noncharring) in concurrent oxidizer flows. Emphasis is placed on making rationally justifiable physical approximations that produce useful results. It is discovered that by making only one additional assumption (steady pyrolysis zone) over that of the previous analysis of
Indrek S. Wichman, Sanjay Agrawal
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Quiescent flame spread over thick fuels in microgravity
Symposium (International) on Combustion, 1996Experimental results for flame spread over thick PMMA in microgravity are reviewed. The results were obtained abouard three different space shuttle missions, STS-54, STS-63, and STS-64. For the three conditions, 50% O 2 in N 2 at 1 atm, 50% O 2 at 2 atm, and 70% O 2 at 1 atm, the flame-spread rate slowly decreases with time, which varied from about
Jeff West +5 more
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Gravitational effects on flames spreading over thick solid surfaces
Acta Astronautica, 1985A theoretical model for the downward spread of a flame in the gas over a semi-infinitely thick fuel bed is presented. Gas-phase chemistry is assumed to proceed at an infinite rate while the fuel bed is taken to pyrolyze at the surface in an Arrhenius fashion. Spread rates and flame shapes are computed for two different ambient oxygen concentrations for
M. Vedha-Nayagam, Robert A. Altenkirch
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Flame spread along thermally thick horizontal rods
Combustion Theory and Modelling, 2002An analysis is carried out of the spread of a flame along a horizontal solid fuel rod, for which a weak aiding natural convection flow is established in the underside of the rod by the action of the axial gradient of the pressure variation that gravity generates in the warm gas surrounding the flame.
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Tests of Thick Flame Combustion Estimates in a Single-Cylinder Engine
Journal of Engineering for Gas Turbines and Power, 1987Estimates of turbulent burning speed, burning zone thickness, and randomness of ignition delay have been incorporated in a model of spark-ignited engine combustion. The estimates have been made on the assumption that turbulence during combustion is homogeneous, isotropic, and has Tennekes’ small-scale structure with integral length scale proportional ...
J. Boisvert, P. G. Hill
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The role of duct thickness on the quenching process of premixed flame propagation
Combustion Theory and Modelling, 2007The propagation of premixed laminar flame in ducts of circular cross-section considering a thermal-diffusive model is investigated numerically. Heat losses by conduction to the channels walls are taken into account using the thermally thin wall regime.
E. Barrios, J. C. Prince, C. Treviño
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A novel method for flame bending of thick-walled pipes
International Journal of Manufacturing Research, 2021Seyed Ehsan Chavoshi +2 more
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Correlating Downward Flame Spread Rates for Thick Fuel Beds
Combustion Science and Technology, 1983Flame spread rates are presented for polymethylmethacrylate fuel beds as a function of gravitational acceleration and ambient pressure and oxygen concentration. The data are correlated by plotting a dimensionless spread rate that is a measure of the heat transferred forward of the flame, required to sustain the flame, compared to the maximum possible ...
R. A. ALTENKIRCH +2 more
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Progress Toward Flame Thickness Measurements from Chemiluminescence of Spherical Flames
AIAA Scitech 2020 Forum, 2020Mattias A. Turner +4 more
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Prediction of Laminar Flame Thickness of Ethanol-Air Pre-Mixture
Transactions of the Korean Society of Mechanical Engineers B, 2004The thickness of laminar flame and preheat zone was computed from equation with burning velocity and the temperature profile, which is obtained by using premix code of Chemkin program for ethanol-air mixture. The computations were carried out under the unburned gas pressure 0.5bar-30bar and temperature of 300k-700K at 1.0.
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