Abstract
An aerodynamic sound generated by a flow inside a pipe is one of the noise problems. In addition to the aerodynamic sound sources, a characteristic of the generated sound is sometimes affected by acoustic and vibration characteristics of the pipe. In this paper, we have performed the experiments and simulations to clarify acoustic and aerodynamic sound characteristics of a T-shaped rectangular cross-sectional pipe. The experiments and simulations were performed under several inflow velocity conditions. The results show that the characteristics of the generated aerodynamic sound in the pipe are strongly affected by the acoustic characteristic of the pipe. Frequency characteristic of the generated sound sources depend on the inflow velocity conditions. However, that of the generated sound does not depend on the inflow velocity conditions, but on the acoustic frequency characteristic of the pipe.
