Space-based microgravity experiments on flame spread over randomly distributed n-decane-droplet clouds: Anomalous behavior in flame spread

2020 ◽  
Author(s):  
Masato Mikami ◽  
Kodai Matsumoto ◽  
Yasuko Yoshida ◽  
Masao Kikuchi ◽  
Daniel L. Dietrich
Keyword(s):  
Flame Spread ◽  
Anomalous Behavior ◽  
Microgravity Experiments

Concurrent-Flow Flame Spread Over a Thin Solid in a Narrow Confined Space in Microgravity

2019 ◽  
Author(s):  
Yanjun Li ◽  
Ya-Ting T. Liao ◽  
Paul Ferkul
Keyword(s):  
International Space Station ◽  
Flame Spread ◽  
Numerical Study ◽  
Space Station ◽  
Spread Rate ◽  
International Space ◽  
Concurrent Flow ◽  
Microgravity Experiments ◽  
Flame Spread Rate ◽  
Flow Duct

Abstract A numerical study is pursued to investigate the aerodynamics and thermal interactions between a spreading flame and the surrounding walls as well as their effects on fire behaviors. This is done in support of upcoming microgravity experiments aboard the International Space Station. For the numerical study, a three-dimensional transient Computational Fluid Dynamics combustion model is used to simulate concurrent-flow flame spread over a thin solid sample in a narrow flow duct. The height of the flow duct is the main parameter. The numerical results predict a quenching height for the flow duct below which the flame fails to spread. For duct heights sufficiently larger than the quenching height, the flame reaches a steady spreading state before the sample is fully consumed. The flame spread rate and the pyrolysis length at steady state first increase and then decrease when the flow duct height decreases. The detailed gas and solid profiles show that flow confinement has competing effects on the flame spread process. On one hand, it accelerates flow during thermal expansion from combustion, intensifying the flame. On the other hand, increasing flow confinement reduces the oxygen supply to the flame and increases conductive heat loss to the walls, both of which weaken the flame. These competing effects result in the aforementioned non-monotonic trend of flame spread rate as duct height varies. This work relates to upcoming microgravity experiments, in which flat thin samples will be burned in a low-speed concurrent flow using a small flow duct aboard the International Space Station. Two baffles will be installed parallel to the fuel sample (one on each side of the sample) to create an effective reduction in the height of the flow duct. The concept and setup of the experiments are presented in this work.

Space-Based Microgravity Experiments on Flame Spread over Randomly Distributed n-Decane-Droplet Clouds: Overall Flame-Spread Characteristics

2018 ◽  
Vol 30 (4) ◽  
pp. 535-542 ◽  
Author(s):  
Masato Mikami ◽  
Yasuko Yoshida ◽  
Takehiko Seo ◽  
Tetsuya Sakashita ◽  
Masao Kikuchi ◽  
...  
Keyword(s):  
Flame Spread ◽  
Microgravity Experiments

Microgravity experiments on flame spread along fuel-droplet arrays at high temperatures

2006 ◽  
Vol 146 (3) ◽  
pp. 391-406 ◽  
Author(s):  
Masato Mikami ◽  
Hiroshi Oyagi ◽  
Naoya Kojima ◽  
Yuichiro Wakashima ◽  
Masao Kikuchi ◽  
...  
Keyword(s):  
High Temperatures ◽  
Flame Spread ◽  
Fuel Droplet ◽  
Microgravity Experiments

Microgravity experiments on flame spread along fuel-droplet arrays using a new droplet-generation technique

2005 ◽  
Vol 141 (3) ◽  
pp. 241-252 ◽  
Author(s):  
M MIKAMI ◽  
H OYAGI ◽  
N KOJIMA ◽  
M KIKUCHI ◽  
Y WAKASHIMA ◽  
...  
Keyword(s):  
Flame Spread ◽  
Droplet Generation ◽  
Fuel Droplet ◽  
Generation Technique ◽  
Microgravity Experiments

Microgravity experiments on flame spread of an n-decanedroplet array in a high-pressure environment

2002 ◽  
Vol 29 (2) ◽  
pp. 2603-2610 ◽  
Author(s):  
Hideaki Kobayashi ◽  
Jeong Park ◽  
Takeshi Iwahashi ◽  
Takashi Niioka
Keyword(s):  
High Pressure ◽  
Flame Spread ◽  
Microgravity Experiments ◽  
High Pressure Environment

scholarly journals SOUNDING ROCKET MICROGRAVITY EXPERIMENTS ELUCIDATING DIFFUSIVE AND RADIATIVE TRANSPORT EFFECTS ON FLAME SPREAD OVER THERMALLY THICK SOLIDS

2004 ◽  
Vol 176 (4) ◽  
pp. 557-584 ◽  
Author(s):  
S. L. OLSON∗ ◽  
U. HEGDE ◽  
S. BHATTACHARJEE ◽  
J. L. DEERING ◽  
L. TANG ◽  
...  
Keyword(s):  
Flame Spread ◽  
Sounding Rocket ◽  
Radiative Transport ◽  
Microgravity Experiments ◽  
Transport Effects

WIDTH EFFECT ON A VERTICAL RPU FLAME SPREAD WITH A MIDDLE LINEAR IGNITION

2015 ◽  
Vol 46 (7) ◽  
pp. 673-687 ◽  
Author(s):  
Hengze Zhao ◽  
Yongming Zhang ◽  
Yuanming Wang ◽  
Lanming Zhao
Keyword(s):  
Flame Spread ◽  
Width Effect
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