平織金網を通過するカルマン渦の減衰特性

抄録

In this study, the attenuation and frequency characteristics of the Karman vortex passing through the wire mesh was investigated. This experiment was conducted by generating the Karman vortex from a cylinder in an acrylic duct of the blowdown type wind tunnel and passing through the wire mesh at the duct exit. The cylinder with a diameter of 6mm was used to generate the Karman vortex, and the Reynolds number was 3000 based on the flow velocity toward the cylinder and the cylinder diameter. The wake of the Karman vortex passing through the wire mesh was measured by hot-wire anemometer, and was visualized by smoke wire method. As a result, it was found that the smaller the wire diameter and open area ratio of the wire mesh, the velocity and turbulence intensity distributions ware more uniform. And, the dominant frequency of the Karman vortex was confirmed that even in the wire mesh that showed uniformity and in the wire mesh that appeared to have collapsed in the photograph by frequency analysis.