Abstract
The acoustic characteristics of a new sound isolation panel, containing ventilation holes, was described in the first and second reports. The panel provides a considerable sound isolation effect in the required frequency band by controlling the acoustic anti-resonance frequency of the sound field inside the panel. However, when the panel is used under air flow field, acoustic normal modes inside the panel are excited by periodic vortex generation. As a result, the flow induced tone occasionally occurs with high sound pressure level. This paper describes a way to reduce the flow induced tone and the pressure loss coefficient with the help of flow visualization.
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