管群気柱共鳴現象の発生に及ぼす管群配列の影響

抄録

In the present paper the attention is focused on effect of arrangement of in-line tube banks on acoustic resonance which occurred in the two-dimensional model of boiler. We have examined the characteristics of acoustic resonance generated from in-line tube banks with tube pitch ratio from 1.4 to 4.0 in the flow direction. It was easy to generate acoustic resonance of low order transverse mode as the tube pitch ratio in the flow direction increased. As the tube pitch ratio in the flow direction decreased, the acoustic resonance of longitudinal mode occurred. The onset velocity of longitudinal mode were lower than that of transverse mode at the small tube pitch ratios.