可視化実験及びLDV計測によるチャネル内遷移流の研究(安定性・乱流境界層・せん断流・遷移(2),一般講演)

概要

論文の詳細を見る
In this work, the turbulent stripe, which was found by the previous DNS study on a turbulent channel flow at transitional Reynolds numbers, was investigated experimentally by flow visualization and LDV measurement. For the bulk Reynolds number of Re_m=1700〜2000, the turbulent stripe was observed to be inclined at angles of 20°〜30° against the streamwise direction, and its streamwise and spanwise wavelength were about 60 and 20〜30 times of the channel half width (δ), respectively. The longitudinal streaks with the spanwise spacing of 1.6δ were found in the quasi-laminar regions. The longitudinal streaks in quasi-laminar regions were different from those in the turbulent regions. The streamwise velocity was measured by Laser Doppler Velocimetry. There were two typical patterns of time trace of streamwise velocity: namely, pattern of puff-like time trace and another pattern.
日本流体力学会の論文
2009-09-02