Abstract
A study is made into the mechanism of noise emission process from an ‘inverse’ open turbulent diffusion gaseous double-concentric jet flame. Correlations are presented between the mean temperatures, mean and fluctuating velocity, and the fluctuating pressure on one hand and the overall noise emission on the other from the natural gas-air flames and the He-air jets. Time mean and temporal component of velocity were measured using a laser doppler anemometry system. The LDA was operated in the fringe mode with a radial rotating diffraction grating. Signal processing was carried out by a counter linked to an on-line mini computer. A comparison is presented between the experimental results and the theoretical predictions based on a rational correlation and shows a good agreement for the peak frequency of the radiated sound power.
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