Reduction of Dominant Combustion Noise from Small Combustors.

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  • 小形燃焼器の卓越燃焼音抑制
  • コガタ ネンショウキ ノ タクエツ ネンショウオン ヨクセイ

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To reduce the dominant noise which is generated in small combustors of domestic water heaters, the phenomenological analyses of dominant sound were conducted, and the factors which exert an influence on the dominant sound were clarrified. In the loudspeaker experiment, it was clarified that the frequency of dominant sound coincides with the resonance frequency determined from the system of combustion chambers, and the oscillation of combustion chambers themselves increases the level of dominant sound. Moreover, the relationship of the input of fuel gas and air ratio with the frequency and level of dominant sound was determined, and the behavior of the transient dominant sound wihch arose at the time of ignition was clarified. Furthermore, based on the results of these analyses, the structure and the dimensions of various parts which are effective for the reduction of dominant sound were shown.

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