A213 Flame Holding aid lifting of Diffusion Flames(Laminar flame-3)

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概要

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• The flame stability limits essentiallly define the fundamental operation of the combustion system. The critical conditions at the stability limits are highly dependent on flow configurations and some species of fuels. For various species of fuels (methane and propane), the flame-base stability mechanism for flame holding has been studied. In this study, the transition behavior from the stable flame attached to nozzle rim to lifting and blow off is observed experimentally in unconfined, quiescent atmosphere and with co-flowing annular air. The lifting and blowoff criteria are proposed for the diffusion flame. Experiments and numerical computations were conducted to investigate the flame structure at the upstream end of the diffusion flames adjacent to the nozzle rim which dominates the flame holding and lifting mechanism and to make clear the flame lifting and the mechanistic causes in diffusion flames. The results obtained are as follows. (1) The upstream end of the diffusion flame is located at the airside near the nozzle rim and consequently lifting is sensitive to air velocity. (2) There exists-a narrow region of the unburned premixed gas between the nozzle rim and the upstream end of the diffusion flame. The flame structure of the upstream end of the diffusion flame consists of the diffusion flame structure in the radial direction together with the premixed flame structure in the axial direction. The flame propagation due to the premixed structure should occur toward the upstream direction. (3) It is estimated that the premixed flame is formed at the upstream end of the diffusion flame and the flame holding is attributed to the balance of the flow velocity and burning velocity.

• 一般社団法人日本機械学会の論文
• 2000-10-01

著者

• Takagi Toshimi

  Depertment Of Mechanical Engineering Graduate School Of Engineering Osaka University

• YOSHIMOTO Takamitsu

  Department of Mechanical Engineering, Kobe City College of Technology

• Yoshimoto Takamitsu

  Department Of Mechanical Engineering Kobe City College Of Technology

• Mao Liqun

  Depertment of Mechanical Engineering, Graduate School of Engineering, Osaka University

• Mao Liqun

  Depertment Of Mechanical Engineering Graduate School Of Engineering Osaka University

関連論文

• Numerical Simulation of Combustion and Nongray Radiative Heat Transfer in a Furnace and Its Comparison with Experiments
• A213 Flame Holding aid lifting of Diffusion Flames(Laminar flame-3)

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