Numerical estimation of noise emitted by radiant tube burner

To estimate the noise emitted by a radiant tube burner, simulated and experimental analyses are carried out. Firstly, combustion noise is measured and the overall characteristic of noise is examined. Secondly, one-dimensional noise analysis programmed with a transfer matrix methodis used. In the previous study, an industrial combustion device with a relatively simple designwas used, and the mechanisms of the emitted noise were clarified. However, at the resonance frequency, the magnitude of the calculated noise was not in agreement with the experiment. Thus, in this study, the decrement of noise energy in addition to the heat generation ratio distribution was taken into account to obtain sufficient accuracy of the noise at the exhaust tube outlet. As a result, the theoretical results in the cases of changing heat input and atmospheric temperature show relatively good agreement with the experimental results, and the analytical method employed in this study has been confirmed to be practical for noise analysis in radiant tube burners.