Abstract
We have performed combustion experiments ofJapanese sparkler called ``senkoh-hanabi'' in 20 sec microgravity conditions by parabolic flight of airplane. TheJapanese sparkler in a closed chamber was ignited by hot wire and the occurrence of spark was observed by video camera. Under the microgravity condition, Japanese sparkler was not sparking. However, after the change of gravity from 0 G to 1.5 G, Japanese sparkler suddenly began to spark. From the observation we conclude that the convections of air around the fire-ball of Japanese sparkler are important to generate sparks.
