抄録
In the previous measurement of the aerodynamic sound generated from an inclined circular cylinder, it was found that the sound pressure level (SPL) changes with the aspect ratios and the inclined angles. Thus, in this study, we have investigated the changes in the vortex structure of the wake considered as one of the causes of the SPL variation. Using the low-noise wind tunnel, we measured the velocity fluctuation of the wake to obtain correlation length. Moreover, the flow visualization tests are performed with a hydrogen bubble method and a numerical analysis method in order to clarify how the wake changes by variation of the inclined angles and the aspect ratios. As a result of this investigation, it was found that the spanwise structure of Karman's vortex street was broken down by the upward flows generated around the bottom endplate and the degree is smaller as the aspect ratio is larger.
