Journal of Thermal Science and Technology
Online ISSN : 1880-5566
ISSN-L : 1880-5566
Papers
Flame spread of droplet-cloud elements with two-droplet interaction in microgravity
Masato MIKAMIHidetaka WATARITsutomu HIROSETakehiko SEOHerman SAPUTROOsamu MORIUEMasao KIKUCHI
Author information
JOURNAL FREE ACCESS

2017 Volume 12 Issue 2 Pages JTST0028

Details
Abstract

This research conducted microgravity experiments to investigate the flame-spread characteristics of the fuel-droplet-cloud element with uneven droplet spacing, which is a basic element of a randomly distributed droplet cloud at the critical condition for group-combustion occurrence. Flame spread to a droplet followed by burning with two-droplet interaction was observed in microgravity to investigate the effect of flame-spread direction and local interactive effect. The results show that the flame-spread rate to a droplet in a perpendicular direction to the axis of two interacting droplets was greater than that to the droplet in the same direction as the axis of two interacting droplets. The temperature distribution around burning droplets was measured by the Thin Filament Pyrometry (TFP) method based on radiation from 14-micron SiC fibers suspending droplets at their intersections. The flame-spread-limit distance increased with two-droplet interaction in both flame-spread directions. This also shows the dependence of the flame-spread direction. The flame spreading after two-droplet interaction in different directions is discussed considering the temperature distribution development. An approximation of the flame-spread-limit distance is also presented.

Content from these authors
© 2017 by The Japan Society of Mechanical Engineers and The Heat Transfer Society of Japan
Previous article Next article
feedback
Top