Abstract
The boiler, which applies a pre-mixed combustion method, has a strong tendency with the extremely loud combustion noise. The noise depends on the geometric structure of boiler system. The aim of the study is to clarify the characteristic of such noise and reduce it. In this paper, the combustion noise caused by the combustion-driven oscillation is replaced with the noise caused by the self-exited oscillation. This kind of oscillating system is called "Rijke tube", and composed of the electrically heated. Applying the slit type muffler in self-exited oscillation system, it is proposed a method of noise reduction with the muffler by absorbing the sound energy as the result of resonance.
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