Blowout Behavior and Attachment Mechanism of Coaxial-Flow Jet Diffusion Flames

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The blowoff and blowout behaviors and the mechanism of attachment to the burner port were examined experimentally for coaxial-flow jet diffusion flames, paying attention to the effects of the rim thickness, velocity combination and swirl intensity. A recirculating flow is formed in the wake of the burner rim, which plays a major role in the process of flame attachment especially for thick-rim burners. The blowout and blowoff limits, therefore, are expressed in a universal form in terms of the momentum flux ratio of the fuel jet to the coaxial air stream and of the velocity of the latter, since the momentum flux ratio governs the configuration of the recirculation zone whereas the latter is related to the intensity of shear or turbulence in and around the recirculation zone.
一般社団法人日本機械学会の論文