Abstract
Experiments have been performed to estimate flame flicker frequency of free jetpropane diffusion flame. The flame was produced at atmospheric pressure with a varyingfuel flow rate from a laminar to the flame blowout conditions. In order to capture globalchemiluminescence, two different optical techniques have been applied to anexperimental investigation into the relationship between the flicker of a diffusion flame and the fuel flow rates. In this paper, the light cell technique and the high-speed camera technique have been used. Power spectral analysis was performed to obtain the frequency mode of the flicker signal, the experimental results obtained by both techniques for imagepixel analysis and spectral analysis of signals have demonstrated that the flicker of a diffusion flame mode depends on the fuel flow rate, and the results show the flame mode was in the range of 10 to 22 Hz which is in very good agreement with previous study offlicker measurements of combustion flames under the same condition..KEYWORDS, Diffusion Flame; Flickering; Optical System; chemiluminescence; Light Cell; CCD Camera; Combustion Instability