脈動流中の静止円柱からの渦放出に関する実験 : 正弦波的な脈動流の場合

概要

論文の詳細を見る
The frequency of vortex shedding from a circular cylinder in oscillatory flows in a pipe is measured. The flow oscillations are induced by means of a rotatable butterfly valve set downstream of the test section. It has been observed that the frequency of vortex shedding varies with both the oscillation-amplitude parameter ΔU/Fd and the Reynolds number Re under constant oscillation frequency. In the case of a large amplitude parameter the frequency of vortex shedding synchronizes with the oscillation frequency of the flow and with one-half of it. The Strouhal number St is nearly constant for a small ratio of oscillation amplitude to the mean velocity ΔU/U, irrespective of the Reynolds number. For large ΔU/U, St decreases with increasing ΔU/U and /or decreasing Re.
一般社団法人日本機械学会の論文
1994-04-25