Fundamental Research on Flame Spread over Condensed Phase Combustibles for Fire Safety Assessment of Low and Super Gravity Environments

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In order to establish the fire safety assessments for space mission, investigation of flame spread over condensed phase materials in various gravity environments is important. In this study, a drop tower, a rotating arm facility and the drop tower with counterweight system are used for a microgravity test, a super gravity test and a low gravity test, respectively. As a result, we have clarified the flame spread rates of the combustible solid and liquid in various gravity levels, microgravity (10^<-5> G), low gravity (0.5～0.9 G) and supergravity (2～5 G). Moreover, we have proposed the simple method of fire safety assessment using the similarity between the gravity effect and the oxygen restriction effect on steady flame spread under normal gravity. And the relationship between the oxygen concentration limit for spreading flame over thermally thin combustible solid under microgravity condition and the opposed flow velocity has also been clarified for extinguishments of space fire.