Aeroacoustic analysis of the two-duct reverse- flow performed elements

Abstract

This paper deals with the derivation of the transfer matrices of the two-duct reverse-flow (expansion and contraction) elements. using both the segmentation arid distributed parameter methods. These have been used to evaluate transmission loss (TL) of the expansion element. U predictions over the entire plane wave frequencies range have been compared. A near complete agreement between the two curves at different mean flow Mach numbers indicates the correctness of the transfer matrices derived by the two methods.