Abstract
With sub-millimetre perforation, a micro-perforated muffler (MPM) has a high acoustic resistance and low mass reactance. It can provide considerable noise attenuation effect in low-frequency range. The wave propagation in a coaxial micro-perforated tube muffler is deduced based on the plane wave hypothesis, and the theoretical transmission loss calculation results are compared with finite element method simulation results. Then, a new type of micro-perforated tube muffler with internal spiral structure (MPMISS) is proposed, to improve the noise attenuation effect in middle and high frequency range. The effects of pitch, length, number of lines and micro-perforation of internal spiral structure on acoustic transmission loss is analysed. The CFD is used to calculate the influence of internal spiral structure on aerodynamic characteristics of tube muffler. Although the internal spiral structure slightly increases the pressure loss, it can prevent the direct transmission of middle and high frequency noise, so as to effectively improve the noise attenuation effect in middle and high frequency range.
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