旋回流による管路内気柱共鳴

概要

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An ecxperimental investigation was carried out on the swirling flow-induced pressure pulsation sins in a pipe, connected to a swirl generator with inlet guide vanes. The pressure fluctuations with discrete frequencies are generated at the pipe inlet. Their frequencies are expressed by two groups of Strouhal number. One is 0.9-0.1 and the other 0.5-0.6. When the frequencies of the inlet pressure fluctuations coincide with the natural frequencies of the pipe, resonant pressure pulsations could be generated. Though, in this experiment, resonances due to the higher group of Strouhal number were not detected, severe resonances of the first three modes due to the lower group of Strouhal number are observed. Accordingly, it is concluded that the swirling flow-induced pressure pulsations in a pipe are considered to be resonant phenomena caused by the Strouhaltype excitation.
社団法人日本ガスタービン学会の論文
1990-03-10