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The stabi l i ty mechanism for holding the flame has been studied. I t is found that the parameters for holding the dif fusion flame are fuel velocity, co-flowing velocity, nozzle diameter (curvature of nozzle), concentration of fuel and so on. When air spouts from the nozzle w i t h co-flowing hydrogen, the inverse dif fusion flame is formed. As the fuel of hydrogen is mixed w i th nitrogen, the di lute inverse di f fusion flame is formed. The inverse dif fusion flame attains to blow-off w i t h increasing the air. The configurations and behaviors of the flame are observed directly and investigated by the h igh speed video camera. Then Experiments and numerical computations by using PHOENICS are conducted to investigate the flame structure which dominates the flame holding ana xifting mechanism. The results obtained are as follows. ( l )The l i f t ing flame is formed i n turbulence model. And the f lame base is formed at the air side. (2) And the reaction rate of hydrogen on the numerical calculation is faster t han experimental value.

Stability Limit of Hydrogen Inverse Diffusion Flame and Numerical Calculation