テーパ円柱の後流構造と空力音特性の解明

抄録

It has been confirmed that the taper cylinder has large effect of aerodynamic noise reduction as compared with the circular cylinder. Then, the structure of wake which contributes to Aeolian tone was investigated in detail by using a hot wire anemometer. The integral length scale of the wake was calculated by the cross-correlation measurement and compared with the spectra of the aerodynamic noise. As a result, it was confirmed that in the tapered cylinder, the vortex scale changes depending on the span direction position. Also, it was considered that the von Karman vortices did not occur in the wake of the tapered cylinder and it was observed of decreasing of the peak level in the sound spectra.