円柱からの空力騒音低減に及ぼす円筒リング形状の影響

抄録

Large aeroacoustic noise is generated by the vortex shedding from a circular cylinder. The suppression of the vortex shedding is one of the important issues in engineering. The instullation of cylindrical rings on a circular cylinder has been proposed as a method to suppress the vortex shedding. In this study, the effect of the configration of cylinderical rings attached to a circular cylinder was investigated on reduction of the aeroacoustic noise by using the low-noise wind tunnel in Reynolds number range from (1.9 to 3.9) × 10⁴. Also, the flow fields in the wake was mesured by using Stereo-PIV. As a result of this study, the sound pressure level decreased by 15 dB compared to a 2Dcylinder due to an appearance of the three-dimensional flow structure in the wake by attaching the cylindrical rings.