浅いキャビティのある L 字管の流体騒音特性について

抄録

An aerodynamic sound generated by a flow inside a duct is one of the noise problems. Flows in ducts with uneven surfaces such as grooves or cavities can be seen in various industrial devices and industrial products such as air conditioning equipment in various plants or piping products. In this paper, we have performed experiments and simulations to clarify acoustic and flow induced sound characteristics of L - shaped duct with a shallow cavity installed. The experiments and simulations were performed under several inflow velocity conditions. The results show that the characteristics of the flow induced sound in the duct are strongly affected by the acoustic characteristics of the duct interior sound field and the location of the shallow cavity. Especially, it was found that the acoustic characteristics were affected by the location of the shallow cavity at high frequencies above 1000 Hz.