|
Liu Yadong
Li Congxin
Ruan Xueyu
National Die & Mold CAD Engineering
Research Center,
Shanghai Jiaotong University,
Shanghai 200030, China
|
|
|
PREDICTION OF ACOUSTIC
PERFORMANCE IN EXPANSION
CHAMBER MUFFLERS WITH MEAN
FLOW BY FINITE ELEMENT METHOD
Abstract: The equation of wave propagation in a circular chamber with mean flow is obtained. Computational solution based on finite element method is employed to determine the transmission loss of expansive chamber. The effect of the mean flow and geometry (length of expansion chamber and expansion ratio)on acoustic attenuation performance is discussed, the predicted values of transmission loss of expansion chamber without and with mean flow are compared with those reported in the literature and they agree well. The accuracy of the prediction of transmission loss implies that finite element approximations are applicable to a lot of practical applications.
Key words:
Wave equation Finite element method Exhaust mufflers Acoustic characteristics |