Abstract
In order to enhance the acoustical performance and reduce the installation volume of muffler, one novel perforated reactive muffler is proposed, in which vortex-shaped expansion chamber is applied. The finite element method was used to predict the transmission loss of the muffler and identify its acoustical characteristics. The results shows that replacing the smooth expansion chamber with the vortex-shaped one could improve the acoustical performance of muffler at 1800~2400Hz. It’s further found the depth and intersection angle of vortex structure are the main factors influencing acoustical performance.
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