Abstract
On the basis of an assumed turbulent premixed gaseous flame model a useful formula is derived for the flame noise intensity, which is considered as an effect of combustion intensity fluctuations and flame zone turbulence. The observed similarity between the change in the flame noise spectrum amplitude and the energy release rate suggests the possibility of a diagnostic interpretation of the noise in terms of combustion intensity. This information becomes less clear, however, when the flame turbulence is strongly developed. The mutual relation between combustion intensity, flame zone turbulence, and amplitude of noise spectrum components suggests an analogy with the basic diagnostic formula.
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