Abstract
Flame spread behavior in closed space such a gallery is affected by the oxygen concentration. Assuming that a flame has aerotaxis, when oxygen concentration decreases, it can be expected that the flame would spreads in the direction of higher oxygen concentration. Experiments were performed in the gallery that branched pectinate and closed except the inlet and outlet. The flame spreads in favor of the route to the outside air when oxygen concentration in the gallery is less than 18 %. Therefore, the flame spread behavior in the gallery has aerotaxis.
