405 マルチファンの非定常せん断を利用した乱流場生成(G05-8 乱流,G05 流体工学)  [in Japanese] 405 Turbulence generation due to unsteady shear using a multi-fan wind tunnel  [in Japanese]

The purpose of the present study is to effectively produce isotropic high-Reynplds-number turbulence using a wind tunnel of multi-fan type. For the modes mainly examined, the fans are divided into two sets in a checkerboard pattern. Blowing and suction are provided to the respective sets of fans with a single sinusoidal component. The suction causes a maximum intensity at the inlet of the test section. Without phase shift, however, natural mixing is not enhanced. A relatively high turbulence Reynolds number has been achieved for a driving mode within a practically small distance.