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Instabilities Of Spreading Diffusion Flames In Microgravity And The Design And Construction Of A Hele Shaw Apparatus That Produces Flames In The Near Extinction Limit Regime Under Simulated Low Gravity Conditions
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Book Synopsis Instabilities of Spreading Diffusion Flames in Microgravity and the Design and Construction of a Hele-shaw Apparatus that Produces Flames in the Near Extinction Limit Regime Under Simulated Low Gravity Conditions by : Lisa Marie Oravecz
Download or read book Instabilities of Spreading Diffusion Flames in Microgravity and the Design and Construction of a Hele-shaw Apparatus that Produces Flames in the Near Extinction Limit Regime Under Simulated Low Gravity Conditions written by Lisa Marie Oravecz and published by . This book was released on 2001 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Examination of a Simulated Micro-gravity Device for Evaluating Flame Instability Transitions and Flame Spread Over Thin Cellulosic Fuels by : Stefanus A. Tanaya
Download or read book Examination of a Simulated Micro-gravity Device for Evaluating Flame Instability Transitions and Flame Spread Over Thin Cellulosic Fuels written by Stefanus A. Tanaya and published by . This book was released on 2004 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Population and Sample Burned Area Analyses for Near Limit Flames in a Simulated Low Gravity Environment Over Thin Cellulosic Fuels by : Karin Laksmi Aditjandra
Download or read book Population and Sample Burned Area Analyses for Near Limit Flames in a Simulated Low Gravity Environment Over Thin Cellulosic Fuels written by Karin Laksmi Aditjandra and published by . This book was released on 2005 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 40th AIAA Aerospace Sciences Meeting & Exhibit by :
Download or read book 40th AIAA Aerospace Sciences Meeting & Exhibit written by and published by . This book was released on 2002 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure and Extinction of Spherical Diffusion Flames in Microgravity by : Karl J. Santa
Download or read book Structure and Extinction of Spherical Diffusion Flames in Microgravity written by Karl J. Santa and published by . This book was released on 2006 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies of Microgravity Diffusion Flames by : Robert W. Vance
Download or read book Studies of Microgravity Diffusion Flames written by Robert W. Vance and published by . This book was released on 2001 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design of a New Narrow Channel Apparatus that Simulates Low Gravity Conditions for Producing Near Limit Flames by : Kaci Jo Gala
Download or read book Design of a New Narrow Channel Apparatus that Simulates Low Gravity Conditions for Producing Near Limit Flames written by Kaci Jo Gala and published by . This book was released on 2007 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Opposed Flow Diffusion Flame Extinction Over a Thin Fuel in Microgravity by : Paul Vincent Ferkul
Download or read book An Experimental Study of Opposed Flow Diffusion Flame Extinction Over a Thin Fuel in Microgravity written by Paul Vincent Ferkul and published by . This book was released on 1988 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flame Spread Experiments in a Simulated Microgravity Environment Using a Couette Flow Apparatus by : Karen Woun-Tein Hung
Download or read book Flame Spread Experiments in a Simulated Microgravity Environment Using a Couette Flow Apparatus written by Karen Woun-Tein Hung and published by . This book was released on 2012 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Couette Flow Apparatus (CFA) was developed to study the effect of a linear velocity gradient on a flame spreading in opposed flow. This apparatus also tests the flammability of materials in a simulated microgravity flow environment. It is a channel with a rectangular cross section that produces a linear air velocity profile above a fuel sample to mimic the boundary layer velocity profile encountered by a flame in an actual microgravity fire. Similar apparatuses have been used to test materials using a parabolic velocity profile, but the purpose of this research is to determine whether or not using a linear velocity profile above the fuel surface produces different results. Simulated microgravity conditions were achieved by minimizing the space above and below the flame to reduce buoyant flow. The apparatus consists of a fixed bottom plate, two side walls, and a moving belt at the top to drive the flow. The belt is made of a Teflon-coated material to withstand the high temperature of the flame since they are in close contact. The side walls and the base plate contain sections of quartz windows so that images and videos could be recorded to show the flame behavior. First, the non-reacting flow was studied. Air velocity measurements were made using hot wire anemometers to determine the velocity profile vertically in the channel. Linear velocity profiles in the channel were not attained until after a fan was added to the outlet to help pull air through; the belt alone was not found to be sufficient. The fan speed was determined by first setting the belt speed and then adjusting the fan speed so that the velocity in the vertical center of the channel was half of the belt speed. The theoretical 2-dimensional flow field was derived analytically by solving the Navier-Stokes equation. The theory predicts that a fan is only necessary to obtain a linear air velocity profile for a smaller width-to-height ratio than what was actually found in the laboratory. The reason for this disagreement is the subject of further research being conducted by another graduate student. It was found that channel is wide enough so that the flow profile is flat over the entire width of the fuel sample. For the combustion tests, the flame speed was tracked using the videos taken through the quartz windows and Spotlight software to obtain flame spread rate. The belt velocity and channel height were varied from 8 to 65 cm/s and 4 to 11 mm, respectively, to study their effect on flame spread. Combustion results indicate that the flame spread rates in the CFA are consistently lower than the spread rates in a traditional Narrow Channel Apparatus due to the flame experiencing more heat loss to the moving boundary of the CFA. The flame spread rates were plotted against average flow velocity for both channels, with peak spread rates occurring at an average flow velocity of around 13-15 cm/s for a 5 mm gap height. Results for the CFA were also plotted against velocity gradient.
Book Synopsis Effects of Diluents on Laminar Premixed Hydrogen Flames in Microgravity by : Li Qiao
Download or read book Effects of Diluents on Laminar Premixed Hydrogen Flames in Microgravity written by Li Qiao and published by . This book was released on 2007 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Buoyant Downward Diffusion Flame Spread and Extinction in Partial-gravity Accelerations by : Kurt R. Sacksteder
Download or read book Buoyant Downward Diffusion Flame Spread and Extinction in Partial-gravity Accelerations written by Kurt R. Sacksteder and published by . This book was released on 1997 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Diffusion Flames: Ignition, Travel, and Burnout (SUBCORE Project: Simplified Unsteady Burning of Contained Reactants) by :
Download or read book Unsteady Diffusion Flames: Ignition, Travel, and Burnout (SUBCORE Project: Simplified Unsteady Burning of Contained Reactants) written by and published by . This book was released on 1999 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Numerical Study of Flame Spread Over Thin Cellulosic Fuels in Microgravity by : Yang Long
Download or read book A Numerical Study of Flame Spread Over Thin Cellulosic Fuels in Microgravity written by Yang Long and published by . This book was released on 2007 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Simulation of Spherical Diffusion Flame Dynamics and Extinction in Microgravity by : Tianying Xia
Download or read book Computational Simulation of Spherical Diffusion Flame Dynamics and Extinction in Microgravity written by Tianying Xia and published by . This book was released on 2015 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamics of an Unsteady Diffusion Flame: Effects of Heat Release and Gravity by :
Download or read book Dynamics of an Unsteady Diffusion Flame: Effects of Heat Release and Gravity written by and published by . This book was released on 1990 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Laminar Diffusion Flame Shapes Under Earth-gravity and Microgravity Conditions by : Jason M. Abshire
Download or read book Laminar Diffusion Flame Shapes Under Earth-gravity and Microgravity Conditions written by Jason M. Abshire and published by . This book was released on 2004 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time-Dependent Computational Studies of Flames in Microgravity by : National Aeronautics and Space Administration NASA
Download or read book Time-Dependent Computational Studies of Flames in Microgravity written by National Aeronautics and Space Administration NASA and published by . This book was released on 2018-11-13 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research performed at the Center for Reactive Flow and Dynamical Systems in the Laboratory for Computational Physics and Fluid Dynamics, at the Naval Research Laboratory, in support of the NASA Microgravity Science and Applications Program is described. The primary focus was on investigating fundamental questions concerning the propagation and extinction of premixed flames in Earth gravity and in microgravity environments. The approach was to use detailed time-dependent, multispecies, numerical models as tools to simulate flames in different gravity environments. The models include a detailed chemical kinetics mechanism consisting of elementary reactions among the eight reactive species involved in hydrogen combustion, coupled to algorithms for convection, thermal conduction, viscosity, molecular and thermal diffusion, and external forces. The external force, gravity, can be put in any direction relative to flame propagation and can have a range of values. A combination of one-dimensional and two-dimensional simulations was used to investigate the effects of curvature and dilution on ignition and propagation of flames, to help resolve fundamental questions on the existence of flammability limits when there are no external losses or buoyancy forces in the system, to understand the mechanism leading to cellular instability, and to study the effects of gravity on the transition to cellular structure. A flame in a microgravity environment can be extinguished without external losses, and the mechanism leading to cellular structure is not preferential diffusion but a thermo-diffusive instability. The simulations have also lead to a better understanding of the interactions between buoyancy forces and the processes leading to thermo-diffusive instability. Oran, Elaine S. and Kailasanath, K. Unspecified Center ALGORITHMS; EARTH GRAVITATION; EXTINGUISHING; FLAME PROPAGATION; MATHEMATICAL MODELS; MICROGRAVITY; PREMIXED FLAMES; TIME DEPENDENCE; BUOYANCY; CONVECTION; GAS MIX...
