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An Experimental Study Of Ignition Effects And Flame Growth Over A Thin Solid Fuel In Low Speed Concurrent Flow Using Drop Tower Facilities
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Book Synopsis An Experimental Study of Ignition Effects and Flame Growth Over a Thin Solid Fuel in Low-Speed Concurrent Flow Using Drop-Tower Facilities by : Richard Dale Pettegrew
Download or read book An Experimental Study of Ignition Effects and Flame Growth Over a Thin Solid Fuel in Low-Speed Concurrent Flow Using Drop-Tower Facilities written by Richard Dale Pettegrew and published by . This book was released on 1996 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722937218 Total Pages :136 pages Book Rating :4.9/5 (372 download)
Book Synopsis An Experimental Study of Ignition Effects and Flame Growth Over a Thin Solid Fuel in Low-Speed Concurrent Flow Using Drop-Tower Facilities by : National Aeronautics and Space Administration (NASA)
Download or read book An Experimental Study of Ignition Effects and Flame Growth Over a Thin Solid Fuel in Low-Speed Concurrent Flow Using Drop-Tower Facilities written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study of ignition and flame growth over a thin solid fuel in oxidizer flow speeds from 0 to 10 cm/sec concurrent flow was performed. This study examined the differences between ignition using a resistively heated wire (woven in a sawtooth pattern over the leading edge of the fuel), and a straight resistively heated wire augmented by a chemical ignitor doped onto the leading edge of the fuel. Results showed that the chemical system yielded non-uniform ignition bursts, while the system using only the hotwire gave more uniform ignition. At speeds up to 2.5 cm/sec, the chemical system yielded non-uniform pyrolysis fronts, while the hotwire system gave more uniform pyrolysis fronts. At speeds of 5 cm/sec or greater, both systems gave uniform pyrolysis fronts. The chemically-ignited flames tended to become too dim to see faster than the hotwire-ignited flames, and the flame lengths were observed to be shorter (after the initial burst subsided) for the chemical system for all speeds. Flame and pyrolysis element velocities were measured. Temperature profiles for selected tests were measured using thermocouples at the fuel surface and in the gas phase. Comparisons between the flame element velocities and peak temperatures recorded in these tests with calculated spread rates and peak temperatures from a steady-state model are presented. Agreement was found to be within 20% for most flame elements for nominal velocities of 5 cm/sec and 7.5 cm/sec. Pettegrew, Richard Dale Glenn Research Center IGNITION; DIFFUSION FLAMES; PYROLYSIS; TEMPERATURE PROFILES; COMBUSTION; DROP TOWERS; VAPOR PHASES; TEMPERATURE MEASUREMENT; THERMOCOUPLES; IMAGE ANALYSIS; ERROR ANALYSIS; FLOW VELOCITY; STEADY STATE; IMAGING TECHNIQUES; OXIDIZERS; ELECTRIC WIRE; NONUNIFORMITY; SURFACE PROPERTIES; FUELS...
Book Synopsis Fourth International Microgravity Combustion Workshop by :
Download or read book Fourth International Microgravity Combustion Workshop written by and published by . This book was released on 1997 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Low-speed Concurrent-flow Flame Spread Over a Thin Fuel by : Gary David Grayson
Download or read book An Experimental Study of Low-speed Concurrent-flow Flame Spread Over a Thin Fuel written by Gary David Grayson and published by . This book was released on 1991 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 41st AIAA Aerospace Sciences Meeting & Exhibit by :
Download or read book 41st AIAA Aerospace Sciences Meeting & Exhibit written by and published by . This book was released on 2003 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Concurrent Flow Flame Spread Study by : Hai-Tien Loh
Download or read book Concurrent Flow Flame Spread Study written by Hai-Tien Loh and published by . This book was released on 1992 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study has been performed of the spread of flames over the surface of thick PMMA and thin filter paper sheets in a forced gaseous flow of varied oxygen concentration moving in the direction of flame spread. It is found that the rate of spread of the PMMA pyrolysis front is time independent, linearly dependent on the gas flow velocity and approximately square power dependent on the oxygen concentration of the gas . The experimental data with thin filter paper sheets shows that the flame spread rate is independent of the flow velocity for forced flow conditions and linearly dependent on the oxygen concentration of the flow. In both experiments, it was found that the flame spread rate data can be correlated in terms of parameter deduced from heat transfer considerations only. This indicates that heat transfer from the flame to the condensed fuel is the primary mechanism controlling the spread of flame. Finite rate chemical kinetic effects have apparently a small influence on the flame spread process itself. Analytical and numerical methods were also employed to study theoretically the name spread process over thermally thick fuel and the influence on the flow field behavior in the presence of a flame. It is found that an analytical model based on a quasi-steady analysis and the flame sheet approximation predicts a square power law dependence of the flame spread rate on the flow oxygen concentration and a linear dependence on the flow velocity. The correct and encouraging qualitative descriptions of the flow structure and surface fluxes in the region downstream from the pyrolysis front.
Book Synopsis Ignition and Flame Growth in Concurrent Forced Flow Over Thick Solids by : Ya-Ting Tseng
Download or read book Ignition and Flame Growth in Concurrent Forced Flow Over Thick Solids written by Ya-Ting Tseng and published by . This book was released on 2007 with total page 228 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 A Complete Parametric Study of Flame Spread Over a Thin Solid Fuel in Opposed-flow Forced-convective and Quiescent Environments by : Douglas A. Seaton
Download or read book A Complete Parametric Study of Flame Spread Over a Thin Solid Fuel in Opposed-flow Forced-convective and Quiescent Environments written by Douglas A. Seaton and published by . This book was released on 1994 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Combined Effect of Oxidizer Flow Velocity, Turbulence and Oxygen Concentration on Ignition and Concurrent Flame Spread on Solid Fuels by : Yu Hang Christopher Chao
Download or read book The Combined Effect of Oxidizer Flow Velocity, Turbulence and Oxygen Concentration on Ignition and Concurrent Flame Spread on Solid Fuels written by Yu Hang Christopher Chao and published by . This book was released on 1994 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solid Fuel Flame Spread and Mass Burning in Turbulent Flow by : Liming Zhou
Download or read book Solid Fuel Flame Spread and Mass Burning in Turbulent Flow written by Liming Zhou and published by . This book was released on 1991 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: The flow turbulence also has a significant effect on the flame extinction conditions, resulting in a smaller extinction velocity for larger flow turbulence intensity. For concurrent flow flame spread, it is found that the flow turbulence decreases the flame spread rate for both floor and ceiling geometries, mainly as a result of the flame length shortening at high turbulence intensity. It is also found that flow velocity intensifies the spread of the flame. The experimental data of flame spread rate, flame length and surface heat flux agree well with the formula obtained from a simplified thermal model, indicating that the heat transfer from flame to solid surface is the dominant controlling mechanism in the turbulent concurrent flame spread and, that the gas phase chemical reaction is of secondary importance.
Book Synopsis A Gallery of Combustion and Fire by : Charles E. Baukal, Jr.
Download or read book A Gallery of Combustion and Fire written by Charles E. Baukal, Jr. and published by Cambridge University Press. This book was released on 2020-09-03 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Gallery of Combustion and Fire is the first book to provide a graphical perspective of the extremely visual phenomenon of combustion in full color. It is designed primarily to be used in parallel with, and supplement existing combustion textbooks that are usually in black and white, making it a challenge to visualize such a graphic phenomenon. Each image includes a description of how it was generated, which is detailed enough for the expert but simple enough for the novice. Processes range from small scale academic flames up to full scale industrial flames under a wide range of conditions such as low and normal gravity, atmospheric to high pressures, actual and simulated flames, and controlled and uncontrolled flames. Containing over 500 color images, with over 230 contributors from over 75 organizations, this volume is a valuable asset for experts and novices alike.
Book Synopsis A Model of Flame Spread Over a Thin Solid in Concurrent Flow with Flame Radiation by : Ching-Biau Jiang
Download or read book A Model of Flame Spread Over a Thin Solid in Concurrent Flow with Flame Radiation written by Ching-Biau Jiang and published by . This book was released on 1995 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Numerical Study of Three-dimensional Flame Propagation Over Thin Solids in Purely Forced Concurrent Flow Including Gas-phase Radiation by : Ioan I. Feier
Download or read book A Numerical Study of Three-dimensional Flame Propagation Over Thin Solids in Purely Forced Concurrent Flow Including Gas-phase Radiation written by Ioan I. Feier and published by . This book was released on 2007 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ignition and Flame Growth in Lean Gas-air Mixtures by : Tor Øyvind Ask
Download or read book Ignition and Flame Growth in Lean Gas-air Mixtures written by Tor Øyvind Ask and published by . This book was released on 1992 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of the Effects of Buoyancy on the Flame Spread Rate Over Thermally Thick Fuels by : Asif R. Rizvi
Download or read book An Experimental Study of the Effects of Buoyancy on the Flame Spread Rate Over Thermally Thick Fuels written by Asif R. Rizvi and published by . This book was released on 1980 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solid Fuel Combustion in a Forced, Turbulent, Flat Plate Flow by : Liming Zhou
Download or read book Solid Fuel Combustion in a Forced, Turbulent, Flat Plate Flow written by Liming Zhou and published by . This book was released on 199? with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study is conducted of the effect of flow velocity, grid-generated turbulence and buoyancy on the combustion of a solid fuel in a flat plate boundary layer flow. The effect of buoyancy is determined by comparing the surface regression rates, flame characteristics, and exhaust products composition for the solid burning in a flow and ceiling orientation. Measurements are presented for the ceiling surface regression rate of PMMA sheets burning in air, and compared with previously obtained floor data. It is concluded that buoyancy has two major, and counteracting, effects. One is to affect the heat transfer by shifting the flame away from the surface in the floor burning and closer to the surface in the ceiling. The other is also due to the flame shifting and the instabilities associated with it that favors, in the floor case, the mixing of the reactants, and consequently the overall heat release rate. In the ceiling, the proximity of the flame to the cold surface causes quenching of the reaction, and the stability of the flame hampers reactants mixing, both of which reduce the heat generation rate. The overall result of these two counteracting mechanisms is that the surface regression rates are not that different in both geometries, although the composition of the combustion products are quite different.
