A-334 斜め円柱の付着線近傍における臨界レイノルズ数

概要

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In order to decide the critical Reynolds number near the attachment line of a three-dimensional boundary layer, characteristic features of sinusoidal disturbances originating from a point source on a yawed cylinder were experimentally investigated. Various frequencies were examined based on Itoh's results by linear stability theory. The excited disturbance consists of two types of unstable waves. One is so-called cross-flow instability mode which is dominant for all the frequencies examined here in comparison with another mode, streamline-curvature instability. The hotwire measurements for the aspects of the cross-flow mode showed that an increase in the frequency of disturbance shifts the neutral point toward the attachment line. In this experiment, a critical Reynolds number was obtained for the off attachment line region. The value is about 7% lower than the well known critical Reynolds number Rc-583 for attachment-line instability.
日本流体力学会の論文
2003-07-28