Author: Howard R. Baum
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
Book Description
Effects of Ignition and Wind on the Transition to Flame Spread in a Microgravity Environment
Author: Howard R. Baum
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
Book Description
Effects of Slow Wind on Localized Radiative Ignition and Transition to Flame Spread in Microgravity
Author: O. Fujita
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
Microgravity Science and Applications Program Tasks
Author:
Publisher:
ISBN:
Category : Fluid dynamics (Space environment)
Languages : en
Pages : 320
Book Description
Publisher:
ISBN:
Category : Fluid dynamics (Space environment)
Languages : en
Pages : 320
Book Description
Dimensional Effects on the Transition From Ignition to Flame Spread in Microgravity
Author: W. E. Mell
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
NIST Building & Fire Research Laboratory Publications
Author:
Publisher:
ISBN:
Category : Building
Languages : en
Pages : 128
Book Description
Publisher:
ISBN:
Category : Building
Languages : en
Pages : 128
Book Description
Ignition and Transition to Flame Spread Over a Thermally Thin Cellulosic Sheet in a Microgravity Environment
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
NASA Technical Memorandum
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 492
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 492
Book Description
Fifth International Microgravity Combustion Workshop
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 552
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 552
Book Description
Effects of Finite Sample Width on Transition and Flame Spread in Microgravity
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
Book Description
In most microgravity studies of flame spread, the flame is assumed to be two-dimensional, and two-dimensional models are used to aid data interpretation. However, since limited space is available to microgravity facilities, the flames are limited in size. It is important, therefore, to investigate the significance of three-dimensional effects. Three-dimensional and two-dimensional simulations of ignition and subsequent transition to flame spread were performed on a thermally thin cellulosic sample. Ignition occurred by applying a radiant heat flue in a strip across the center of the sample. The sample was bounded by an inert sample holder. Heat loss effects at the interface of the sample and the sample holder were tested by varying the thermal-physical properties of the sample holder. Simulations were also conducted with samples of different widths and with different ambient wind speeds (i.e., different levels of oxygen supply). The width of the sample affected both the duration of the flame transition period and the post-transition flame spread rate. Finite width effects were most significant when the ambient wind was relatively small (limited oxygen supply). In such environments, the velocity due to thermal expansion reduced the net inflow of oxygen enough to significantly affect flame behavior. for a given sample width, the influence of thermal expansion on the net incoming oxygen supply decreased as the ambient wind speed increased. Thus, both the transition and flame spread behavior of the three-dimensional flame (along the centerline) tended to that of the two-dimensional flame with increasing ambient wind speed. Heat losses to the sample holder were found to affect the flame spread rate in the case of the narrowest sample with the slowest ambient wind.
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
Book Description
In most microgravity studies of flame spread, the flame is assumed to be two-dimensional, and two-dimensional models are used to aid data interpretation. However, since limited space is available to microgravity facilities, the flames are limited in size. It is important, therefore, to investigate the significance of three-dimensional effects. Three-dimensional and two-dimensional simulations of ignition and subsequent transition to flame spread were performed on a thermally thin cellulosic sample. Ignition occurred by applying a radiant heat flue in a strip across the center of the sample. The sample was bounded by an inert sample holder. Heat loss effects at the interface of the sample and the sample holder were tested by varying the thermal-physical properties of the sample holder. Simulations were also conducted with samples of different widths and with different ambient wind speeds (i.e., different levels of oxygen supply). The width of the sample affected both the duration of the flame transition period and the post-transition flame spread rate. Finite width effects were most significant when the ambient wind was relatively small (limited oxygen supply). In such environments, the velocity due to thermal expansion reduced the net inflow of oxygen enough to significantly affect flame behavior. for a given sample width, the influence of thermal expansion on the net incoming oxygen supply decreased as the ambient wind speed increased. Thus, both the transition and flame spread behavior of the three-dimensional flame (along the centerline) tended to that of the two-dimensional flame with increasing ambient wind speed. Heat losses to the sample holder were found to affect the flame spread rate in the case of the narrowest sample with the slowest ambient wind.
Building and Fire Research Laboratory Publications
Author: Building and Fire Research Laboratory (U.S.)
Publisher:
ISBN:
Category : Building
Languages : en
Pages : 128
Book Description
Publisher:
ISBN:
Category : Building
Languages : en
Pages : 128
Book Description