Abstract
Experiments were performed to investigate effects of fuel velocity fluctuation on combustion behavior of diffusion a jet flame. The fuel employed was methane. Periodic fuel supply was realized using an electromagnetic valve of quick-response type and damper. By utilizing the microgravity conditions, the flame behavior affected by the fuel supply fluctuation was clearly observed. The tip of the flame departed from main part under higher conditions of mean fuel velocity, amplitude ratio of fuel velocity fluctuation and its frequency. The normalized variation of the flame length showed a maximum around the frequency of 5Hz, and decreased with increasing the frequency from 5Hz. The effect of mean fuel velocity on the normalized flame length variation was less remarkable under microgravity.
