円柱からの渦発生に及ぼす音響の干渉
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概要
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In this paper, acoustic interferences in periodic vortex-shedding from a circular cylinder in an air flow are investigated with the aid of constant temperature hot-wire anemometers, a frequency analyzer and so on. In this way, we investigated the mechanism of vortex-shedding. Experiments were made at Reynolds numbers of 1800 and 5600, and sounds for each Reynolds number were progressive and standing sound fields, respectively. As the result of the acoustic interferences, the vortices are shedded nearer the cylinder, and are stronger than these without sounds. ; however, the shedding frequency changes a little. There are two acoustic frequency groups which produce powerful effects on vortex-shedding. One is a narrow frequency range centering around the natural vortex-shedding frequency, and the other is a relatively wide frequency range which corresponds to the frequency of the laminar-turbulent transition wave in the separated boundary layers. The latter has a larger effect on the vortex-shedding than the former.
- 社団法人日本音響学会の論文
- 1971-05-10