Finite element based acoustic analysis of dissipative silencers with high temperature and thermal-induced heterogeneity
Dissipative silencers including high temperature and thermal gradients are analysed. A mixed finite element model combining velocity potential and acoustic pressure is derived. Temperature gradients lead to spatial variations of absorbent material properties, mean flow and perforated duct impedance. Attenuation overestimation is likely to be predicted if the temperature distribution is not taken into account.
acoustics silencer high temperature heterogeneity gradient absorbent material flow fem