Combined analytical models for sound generation and transmission in cambered axial-flow outlet guide vanes

A new analytical approach is proposed to predict sound transmission through a row of outlet guide vanes taking into account the curvature and the inclination of the vanes. The approach couples two analytical tools, namely a mode-matching procedure iteratively applied at the leading-edge and trailing edge interfaces, and an approximate transmission model inside the inter-vane channels. Both curvature and inclination are shown to have a significant effect on the reflection and transmission coefficients. They are addressed separately for the sake of a better understanding of the involved mechanisms. The complete chaining of the models is out of the scope of the paper. The interest of the approach is that it could be extended in a three-dimensional annular geometry to address sound generation and transmission problems. (C) 2016 Elsevier Masson SAS. All rights reserved.