To investigate the interaction between the droplets in the spray combustion, microgravity experiments were performed. The experimental apparatus mainly consists of a combustion chamber, an 8 mm video camera and a 35 mm single-lens reflex camera. Fuel droplets of butanol or hexanol are arranged 2-dimensionally, representing the fuel droplet cloud in the splay. Electrically heated nichrome wires ignite the fuel samples simultaneously. The 35 mm camera observes the flame shape history. The effects of sample space on the flame shape are investigated . Main results obtained are in the followings: Because of the interaction between droplets, the unsteady combustion period. in which fuel vapor is accumulated around the droplets, becomes long . As the result, the steady state combustion is not observed in the combustion process and the flame size keeps increasing until it dis appears.
