層流境界層中の周期低速ストリークの不安定性に関する実験的研究(流体工学,流体機械)

概要

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The streak instability is examined experimentally through artificially producing spanwiseperiodic low-speed streaks in a flat-plate laminar boundary layer. The observation focuses on sinuous instability modes which are responsible for the regeneration of quasi-streamwise vortices in near-wall turbulence. Effects of the interaction between disturbances developing along the neighboring streaks on the instability are examined through comparing the disturbance development for various streak spacing. The instability characteristics are also compared with those for a single low-speed streak. The development of subharmonic modes does not strongly depend on the streak spacing and they grow with almost the same growth rate as that for the single streak. By contrast, the development of fundamental modes is very sensitive to the streak spacing, and is completely suppressed when the streak spacing is less than 2.5 times the streak width.
一般社団法人日本機械学会の論文
2003-07-25