透過性円筒下流の流れに及ぼす音響かく乱の影響に関する実験的研究

抄録

The effect of acoustic disturbance on the wake flow downstream of a permeable hollow cylinder was studied. Two counter-facing loudspeakers were placed at the exit of the wind tunnel with its crossing axis orthogonal to the cylinder axis. The frequency of the acoustic wave was selected from 300 to 2400 Hz. Two types of wire-mesh permeable cylinders with different apertures were prepared together with a solid cylinder with impermeable surface for comparison. Velocity fields downstream of these cylinders were measured by LDV. It was confirmed that acoustic disturbances certainly affect the development of the cylinder wake, and in particular, the location where the decelerated flow through the permeable cylinder begins to recover was observed to move upstream or downstream, depending on the acoustic frequency.