Stability of Diffusion Flames in High Gravity Fields

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Behavior of diffusion flame under various gravity level was experimentally investigated for better understanding of flame stability. Flame length and width were measured as the function of gravity scale. Also, how the gravity affects on the stability and blow off behavior of the flame were discussed. The gravity level was artificially controlled by using a spin tester in the gravity range from G=1 to G=15, where G=1 means the gravity on the earth. The laminar diffusion flames of methane and propane gas were made on the tip of the small vertical pipe where the vertical direction means an opposite direction of the artificial gravity.The results showed that the flame became unstable with an increase of gravity level. The flame length decreased and the blue flame length increased with an increase of gravity level for every fuel. These results are explained by the promotion of natural convection flow which was caused by an increase of buoyancy force. The flickering of flame and blow off were observed in a high gravity level. It was confirmed that the instability of a diffusion flame strongly depended on the gravity level.