Concurrent Flow Flame Spread Study PDF Download
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 161
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 161
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Author: Gary David Grayson
Publisher:
ISBN:
Category :
Languages : en
Pages : 166
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Author: Hai-Tien Loh
Publisher:
ISBN:
Category :
Languages : en
Pages : 318
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Author: Yu Hang Christopher Chao
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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Book Description
Author: Ama R. Carney
Publisher:
ISBN:
Category : Aerospace engineering
Languages : en
Pages : 125
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Book Description
Microgravity experiments are performed to study wind-assisted flame spread over discrete fuel elements. Ultra-thin cellulose-based fuel segments are distributed uniformly in a low-speed flow and flame spread is initiated by igniting the most upstream fuel segment. Similar to continuous fuels, flame spread over discrete fuels is a continual process of ignition. Flame propagation across a gap only occurs when a burning fuel segment, before it burns out, ignites the subsequent segment. During this process, gaps between samples reduce the fuel load, increasing the apparent flame spread rate and decreasing the heat transfer between adjacent segments. The reduction in heat transfer decreases the solid burning rate. In this study, sample segment length, gap size, and imposed flow velocity are varied to study the impacts on burning characteristics, including propensity of flame spread, flame spread rate, and solid burning rate. Detailed profiles of the transient flame spread process are also presented.
Author: A. Carlos Fernandez-Pello
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 126
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Book Description
A research program is being conducted to study the mechanisms controlling the spread of fire in turbulent forced gas flows moving in the direction of flame propagation. The research tasks completed during this reporting period include experimental studies of the effect of flow turbulence on the rate of concurrent flame spread, and of mass burning when the combustible material is in a floor configuration. The results of the experiments with thick PMMA sheets show that flow turbulence affects significantly the flame spread and mass burning processes. As the turbulence intensity is increased, the flame spread rate decreases because the flame length sharply decreases, and the mass burning rate increases because the surface heat flux increases. Currently underway is a complementary study with the combustible material placed in a ceiling geometry to observe the effect of buoyancy on the flame spread and mass burning processes. An additional task also completed during this period is a review of the processes of ignition and flame spread of solid combustibles.
Author: Howard D. Ross
Publisher: Elsevier
ISBN: 0080549977
Category : Technology & Engineering
Languages : en
Pages : 601
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Book Description
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
Author: A. C. Fernandez-Pello
Publisher:
ISBN:
Category : Air flow
Languages : en
Pages : 19
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Book Description
A research program is being carried out to study the mechanisms controlling the spread of fire in a forced gas flow. Particular emphasis is given to the case when the gas flow is concurrent with the direction of fire spread. The research tasks completed during this reporting period include an experimental study of the effect on the flame spread rate of the turbulence intensity of a concurrent air flow, and a theoretical analysis of the effect of a prescribed gas velocity profile on the flame spread rate predictions. The results of the experiments show that for flames spreading over thick PMMA sheets, the flame spread process is significantly affected by the flow turbulence intensity. For a fixed flow velocity, the flame spread rate decreases as the turbulent intensity is increased. This appears to be mainly due to the shortening of the flame length. Schlieren images of the process indicate that the decrease of the flame length may be the result of the intense entrainment of cold air in the flame at the higher turbulent intensities. The results of the theoretical analysis indicate that the gas velocity profile influences strongly the flame spread rate predictions.
Author:
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 490
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Book Description
Author: Paul Vincent Ferkul
Publisher:
ISBN:
Category :
Languages : en
Pages : 160
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Book Description
