Abstract
The sound radiation from a cylindrical duct having cavities at the open end and in the duct has been studied numerically and experimentally. The structures of the entire sound field is numerically obtained for various depths and radii of the cavity. The governing equation for acoustic disturbance is a linearized Euler equation and is solved by a finite difference method. The present study shows that the cavity at the open of the duct affects the directivity of the radiated sound field and the one in the duct reduces the sound power significantly. The result also shows that the radiated sound level is decreased as the distance between two cavities approaches a particular value.
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