垂直渦管の影響をうけるよどみ流予混合火炎の火炎面挙動(反応・多相系燃焼・反応(1),一般講演)

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We investigated the flame front motion of stagnating premixed flame where vortex tube impinged vertically. The vortex tube was formed by rotating the rotational rod which was installed inside the nozzle burner. The range of the rotational frequency of the rotational rod was varied from 0rpm to 2000rpm. The mixture was lean (φ=0.70) methane/air. As the rotational frequency of the vortex tube increases, the flame front motion shifts from the stable flame to the single periodic flame motion and from the single periodic motion to double periodic motion. With the transition of flame motion mode from single to double periodic motion, the flame oscillates horizontally as well as vertically. We analyzed both frequencies of the flame oscillation, and the results showed the frequency of the vertical oscillation was around 4 and 9Hz, and that of the horizontal oscillation was around 4Hz.
2009-09-02