予混合燃焼における流速および濃度変動の燃焼騒音への影響

概要

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A study was carried out to determine the relationship between the sound pressure generated by open premixed flames and the velocity and fuel concentration fluctuations in unburned mixture flow at a cylindrical single-port burner. The sound pressure from the turbulent flames was measured for various velocity and gas concentration fluctuations in the mixture flow. To evaluate the velocity and concentration fluctuations, the radial profiles of the fluctuations were measured. The volocity fluctuation and concentration fluctuation averaged by the flow rate were used as indexes respectively. It was found that a strong relationship existed between the velocity fluctuations and sound pressure generated by the turbulent premixed flames on the burner. The maximum sound pressure was generated by turbulent flames having an air ratio between 0.8 and 1.0 when there was no concentration fluctuation. In the presence of gas concentration fluctuations, the level of sound pressure was increased for the same velocity fluctuation. It was found that the leaner the mixture, the stronger the effect of the concentration fluctuation on the sound pressure generation.
社団法人日本機械学会の論文
1997-02-25