格子状に並んだ縦渦を縮流した流れ場が拡散作用に及ぼす影響

抄録

This study investigated the effect of longitudinal vortices arrangement on the turbulent diffusion. Interaction of longitudinal vortices may cause an increase in the diffusion effect. We used two vortex generators (VG). One is susceptible to interaction on longitudinal vortices and the other is not. VG was mounted on upstream of contraction of wind tunnel. Longitudinal vortices in the contraction area were stretched and the vorticity increased. CO₂ gas was injected into wind tunnel from one point source. To evaluate diffusion, CO₂ concentration was measured in the downstream region. As a result, the concentration distribution of CO₂ in the downstream direction was clarified, and the difference in the turbulence diffusion effect of two VG was clarified.