In many applications aeroacoustic sources occur in ducted environments. A most important application is, of course, the internal sources of noise on a high bypass-ratio turbofan engine that is commonly used in commercial aircraft transportation. The duct has a large impact on the both the flow through the engine and the acoustic source efficiency. In this chapter the important issues of duct propagation will be discussed, including the effect of acoustic absorption by material that can be placed on the duct walls to attenuate the sound before it is radiated from the duct exits to the acoustic far field.
Duct acoustics; Liners; Inlet radiation; Duct modes; Green's function in a duct
In many applications ...
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