109 渦放出に及ぼす格子配列円管群内のキャビティの影響(空力騒音(1))

概要

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In the present paper the attention is focused on the effect of small cavities inside in-line tube banks on vortex shedding. We measured the SPL of acoustic resonance, the spectrum of velocity fluctuation, the amplitude and phase delay of acoustic pressures and the gap velocity. As a result, we found broad-band frequencies of velocity fluctuation with Strouhal number about S_t=0.09-0.22 in the cavities without acoustic resonance. The center frequency of velocity fluctuation was about S_t=0.15. The vortex shedding frequency in the cavities was the same as the result of no cavities. And the periodicity and intensity of velocity fluctuation due to vortex shedding increased rather than that of tube banks. Therefore, it was easy to generate acoustic resonance of S_t=0.15 when there were small cavities inside in-line tube banks.
一般社団法人日本機械学会の論文
2010-06-26