F122 キャビティ上のはく離せん断層の振動特性に関する実験

概要

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This research has been performed to clarify the oscillation of a separating shear layer over a cavity formed peripherally on a cylinder in a uniform axial stream. Experiments have been carried out for the cavity of a width-to-depth ratio of 4 in a water channel. Measurements have been made along and/or across the shear layer using the UVP monitor. Wavenumber-frequency spectrum is calculated by two-dimensional Fourier transform along the shear layer, and it is found that a convective velocity of flow structures is nearly equal to 0.55 U_m. The proper orthogonal decomposition is applied to the UVP dataset, and random coefficients at the lower order POD-modes are examined. There exist two dominant time scales in the present shear layer, that is, fb/U_m≈0.1 and 0.9.
日本流体力学会の論文
2001-07-31