アクティブ乱流格子により風洞内に生成された大規模乱流境界層の構造特性(風工学(4),一般講演)

概要

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The characteristics of turbulence boundary layer generated by active turbulence grid (ATG) in the wind tunnel have been experimentally investigated. The 2-component instantaneous velocities were measured with an X-type hot wire, and turbulence statistics, including higher order moments, were accumulated. In addition, the instantaneous velocity vectors were obtained with a particle image velocimetry. Through the measurements, it was found that the turbulence structure in the boundary layer significantly differs from that of normal wall turbulence, i.e., the turbulence generation in the boundary layer with ATG is directly related to the 'Q4' motions (sweep) with large-scale velocity fluctuation, while that of normal wall turbulence is mainly caused by 'Q2' motions (ejection).
日本流体力学会の論文
2007-08-06