The results of an investigation of the dynamic behavior of a bluff-body stabilized diffusion flame are reported. The dynamic characteristics of flames established by different air and fuel flow rate conditions are investigated using 500 frames/s ciné pictures and two spectrophotometers turned to the CH emission at 431.5 nm. Each spectrophotometer vied a 1.8 x 64-mm area of the flame with the long dimension symmetrically located at the diameter. Downstream of the recirculation zone the flame consists of large, discrete "fireballs" or flame turbules separated by axial regions where the flame is not visible. Flame turbule time widths are typically between 1.5 and 12 ms depending on fuel and air flow rates and axial location and their average velocity is approximately equal to the annulus air injection velocity.
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