抄録
The flame length of swirling diffusion flames of gaseous fuel was measured by means of photography for several swirl intensities of the gas flow at the burner exit. Hydrogen, mixture of hydrogen and propane and acetylene were employed as fuels in the experiment and were issued vertically from a cylindrical swirl burner in free air. The flame length increased gradually with increasing gas exit velocity and then became a constant independent of the exit velocity in fully developed turbulent region. The intensity of the swirl was observed to have a strong effect on the flame length. The constant turbulent flame length was obtained as a function of the stoichiometric concentration of the gaseous fuel and the swirl intensity at the burner exit by modifying the swirl intensity to the empirical equation of a nonswirling turbulent diffusion flame.
