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The University of Southampton
Engineering

Acoustics of Turbofan Duct Systems

A key application of duct acoustics research is the acoustics of turbofan duct systems. There has been considerable research in duct acoustics over the past forty years, largely owing to the advent of the high-bypass-ratio turbofan engine used in civil aviation.

Sketch of turbofan engine

There are a number of turbomachinery noise sources, such as fan, compressor, combustion and turbine noise. These generate tonal and broadband noise.

 Noise source region in turbofan engine

The propagation of the sound in turbofan duct systems, in particular within the intake and bypass ducts, and the forward and aft radiation of the sound, are investigated in duct acoustics research.

Sound propagation and radiation from a turbofan engine

Duct acoustics methods include analytical, semi-analytical and numerical techniques to predict the sound propagation and radiation.

For a detailed review of duct acoustics research in the context of turbofan engines, the following review articles by Nayfeh et al. in 1975 and Eversman in 1991 provide excellent summaries of research up to 1975 and 1991, respectively.

Nayfeh, A.H., Kaiser, J.E. and Telionis, D.P. Acoustics of aircraft engine-duct systems, AIAA Journal, 13(2), 1975, 130-53.

Eversman, W. Theoretical models for duct acoustic propagation and radiation, In Aeroacoustics of Flight Vehicles: Theory and Practice, Vol. 2: Noise Control, NASA RP-1258, 1991, 101-63.

 

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