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An Experimental Study Of Opposed Flow Diffusion Flame Extinction Over A Thin Fuel In Microgravity
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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 Microgravity Combustion Science by :
Download or read book Microgravity Combustion Science written by and published by . This book was released on 1989 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microgravity Combustion by : Howard D. Ross
Download or read book Microgravity Combustion written by Howard D. Ross and published by Elsevier. This book was released on 2001-09-03 with total page 601 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis Opposed-Flow Flame Spread Over Solid Fuels in Different Burning Regimes by : Luca Carmignani
Download or read book Opposed-Flow Flame Spread Over Solid Fuels in Different Burning Regimes written by Luca Carmignani and published by . This book was released on 2019 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several aspects of opposed-flow flame spread are experimentally investigated because of their relevance in fire safety studies. Different burning regimes based on the intensity of the opposed flow velocity are identified for acrylic fuels. In downward flame spread, where the flow around a flame is only naturally induced by gravity, the spread rate is highly dependent on fuel size and geometry. The fuel cross-sectional shape is experimentally varied, and a formula which takes into account geometrical effects is proposed by extending previous solutions for two-dimensional flames. The burning region of a solid fuel shows a consistent slope due to the competition between flame spread and surface regression. The angle at the vertex of the pyrolysis region, called burn angle, can be used to indirectly calculate the fuel burning rate. The burn angle depends on fuel thickness; a numerical model and a scale analysis are used to explore the reasons for this behavior. Next, the effect of a forced flow is investigated. The extreme case of blow-off extinction over thin fuels is considered, with flames extinguishing at locations determined by the flow velocity. Results suggest that the interaction between fuel and flow field is more important than the dependence on fuel thickness. The evolution of flame structure and pyrolysis also appear to be driven by flow interactions. A scale analysis is used to explore these dependencies. Finally, previous microgravity experiments are used to explore differences and similarities with ground-based results. By suppressing the buoyant flow, flame radiation becomes essential for the flame spread process. The experimental conditions are simulated numerically to describe the importance of a developing boundary layer in this regime. A numerical parametric study of the radiative emission of flames in microgravity, inspired by the experimental data, shows its dependence on flame area, mass burning rate and flame temperature by changing the burning conditions. For these small flames, soot does not seem to dominate flame radiation, although its generation increases with fuel thickness, oxygen concentration and flow velocity. The experiments in microgravity considered in this work showed flame extinction in a quiescent environment. However, two acrylic cylinders at higher oxygen concentrations from a previous investigation can burn vigorously. To clarify whether these flames are stable, a scale analysis is used to study the influence of surface curvature on radiation losses.
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:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 988 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 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:
Download or read book STAR written by and published by . This book was released on 1965 with total page 2216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Oxygen Concentration on Flame Spread Over Thin Fuels in Different Regimes by :
Download or read book Effect of Oxygen Concentration on Flame Spread Over Thin Fuels in Different Regimes written by and published by . This book was released on 2018 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this research is to investigate how oxygen concentration, opposed flow velocity and thickness of a thin PMMA fuel affect the flame spread rate and flame extinction in microgravity. The flame spread rate increases with an increase in oxygen concentration. The critical oxygen level, which is the minimum concentration for a flame to spread, is inversely related to the fuel thickness. For fuel thickness above and below a critical thickness, the flame spread rate increases and decreases with a decrease in fuel thickness, respectively. Also, an unexpected extinction is discovered. The critical fuel thickness is inversely related to the opposed flow velocity. The flame spread rate decreases when the opposed flow velocity decreases. Unexpected extinction is discovered when oxygen level is low and opposed flow is absent or weak. The simulation results are consistent with the available experimental results obtained by NASA. For a quiescent environment in microgravity, the critical oxygen level increases with the fuel thickness while the critical oxygen level decreases with the fuel thickness for environments with an opposed flow. The research on how a flame extinguishes reveals that the flame temperature in the anomaly region is lower than the flame temperature in the normal region. A flame extinguishes when the percentage surface radiation loss, which is the ratio of the surface radiation loss to heat generated from combustion, is higher than 45% with an opposed flow and 48% in quiescent environment.
Book Synopsis Experimental Investigation of Laminar Gas Jet Diffusion Flames in Zero Gravity by : Thomas H. Cochran
Download or read book Experimental Investigation of Laminar Gas Jet Diffusion Flames in Zero Gravity written by Thomas H. Cochran and published by . This book was released on 1971 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental program was conducted to study the burning of laminar gas jet diffusion flames in a zero-gravity environment. The tests were conducted in the Lewis Research Center's 2.2- Second-Zero-Gravity Facility and were a part of a continuing effort investigating the effects of gravity on basic combustion processes. The photographic results indicate that steady state gas jet diffusion flames existed in zero gravity but they were geometrically quite different than their normal-gravity counterparts. Methane-air flames were found to be approximately 50 percent longer and wider in zero gravity than in normal gravity.
Book Synopsis Physics of Fluids in Microgravity by : Rodolfo Monti
Download or read book Physics of Fluids in Microgravity written by Rodolfo Monti and published by CRC Press. This book was released on 2002-01-10 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a microgravity experiment, the conditions prevalent in fluid phases can be substantially different from those on the ground and can be exploited to improve different processes. Fluid physics research in microgravity is important for the advancement of all microgravity scients: life, material, and engineering. Space flight provides a uniqu
Book Synopsis Experimental Study of the Effect of Fuel Thickness on Opposed Flow Flame Spread Over PMMA by :
Download or read book Experimental Study of the Effect of Fuel Thickness on Opposed Flow Flame Spread Over PMMA written by and published by . This book was released on 2015 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research presented below intends to investigate the role of Poly methyl methacrylate (PMMA) fuel thickness on the spread rate of a downward spreading flame, the thermal radiation being emitted by the flame, and to compare results for both microgravity and normal gravity. To simplify the complex problem of flame spread over solid fuels, the concept of the thermal regime is used to find a constant spread rate for a given fuel thickness. In the thermal regime the opposed flow velocity is high enough to neglect losses due to radiation from the flame but still small enough to not affect the flame through finite rate kinetics. The microgravity results were performed on the International Space Station in the Bass-II Microgravity Science Glove box. This 7.62 cm square duct allows the variation of opposed flow velocity while holding pressure, oxygen and nitrogen constant during each run. The runs are recorded using a digital video camera for spread rate analysis and thermal radiation is read using a radiometer. For normal gravity, SDSU's Flame Stabilizer was used to acquire the downward spread rate from video analysis and thermal radiation is read by a radiometer developed here at SDSU. With the use of a Matlab image analysis code, the videos are analyzed to obtain the spread rate for each fuel thickness. When compared, these results show good experimental agreement for spread rate and thermal radiation. These results, along with known thermodynamic properties and scaling analysis are used to refine the de Ris-Delichatsios formula for the thermal regime. With very few examples of the de Ris-Delichatsios formula being matched to experimental results it is hard to define where the thin regime ends and where the thick regime starts. The refined formula is applied to both the thin and thick regimes to show approximately where the transition lies between the two and compared to experimental results. This transition zone in both microgravity and normal gravity is of great interest for researchers trying to predict the behavior of flame spread both here on earth and in space aboard the International Space Station.
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.
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microgravity Combustion Science: 1995 Program Update by :
Download or read book Microgravity Combustion Science: 1995 Program Update written by and published by . This book was released on 1995 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
