1508 流れ場と壁面せん断応力変動及び圧力変動の同時計測による粗面乱流境界層内の特徴的渦構造の抽出

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  • 1508 Extraction of characteristic vortex structures in a rough wall turbulent boundary layer by the simultaneous measurement of the flow field and the wall shear stress fluctuation, and the wall pressure fluctuation

説明

The relationships between characteristic vortical structures and the wall surface pressure fluctuations in a rough wall turbulent boundary layer with zero pressure gradient are investigated by means of laboratory experiments using a wind tunnel and velocity, shear stress, and wall pressure measurements. To investigate the relationships mentioned above, simultaneous measurements of the streamwise flow velocity near the wall, the wall shear stress fluctuations, and the wall pressure fluctuations were carried out using an I-type hot-wire probe, a near-wall hot-wire probe and a microphone pressure sensor. Characteristic vortical structures are presented by the wall typical pressure fluctuations time history distributions obtained by using conditional sampling methods of the wall-shear stress maximum value and its interval.

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