Output details

A computational mode-matching approach for sound propagation in three dimensional ducts with flow

Significance of output:

Aircraft noise is the most important environmental factor restricting the expansion of air transport. Predicting absorption of noise by acoustical liners in intake ducts of turbofan engines is critical to reduce noise. Recent engine designs have liners which installed in one piece. This ‘spliceless’ design reduces by up to 5dB, noise from critical engine tones. It is compromised in service by liner damage and the resulting repairs. This article presents one of several new methods developed at the ISVR to predict the acoustic effect of liner repairs (‘hard patches’) on spliceless intake liners. It was funded directly by Rolls-Royce.