円筒リングを設置した円柱流れにおける抗力と空力騒音の低減に関する研究

抄録

The increasing of the aerodynamic force and aeroacoustic noise are caused by the vortex shedding generated from a circular cylinder. The suppression of the vortex shedding is one of the important issues in engineering. In order to reduce the aerodynamic force and aeroacoustic noise, the drag coefficients and sound pressure level of the cylinder attached with the cylindrical rings was experimentally measured. In this study, the reduction effect of the aerodynamic force and aeroacoustic noise generated from the cylindrical rings is investigated by using the low-Noise wind tunnel in the Reynolds number ranged from (1.9 to 5.0) × 10⁴. As a result of this study, the drag coefficients and sound pressure level reduction was confirmed. These ring pitches of 4 decrease the drag coefficients and sound pressure level by 15 % and 16 %, compared with the no rings.