Acoustic optimization of anechoic termination with and without superimposed flow

摘要

This paper deals with the optimization of anechoic terminations of two types: full-flow and resistive terminations that can be used for the first one with flow and for the second one without flow only. In both cases, analytical models are made to predict the reflection coefficient of the terminations. This is used to make an optimization and the chosen configurations are validated by measurements. For a full-flow termination of 1m length, a reflection coefficient lower than 20% is reached from 170 Hz and, for the resistive termination, a null reflection coefficient is obtained up to 500 Hz and lower than 10% up to 2000 Hz.