Abstract
The flow presents an important factor influencing the acoustic propagation inside a duct element. In this paper, a three dimensional numerical method based on the convected Helmholtz equation was used to evaluate this effect in the case of cylindrical wall - lined - wall duct element by simulating the acoustic field inside a duct element presenting an impedance discontinuity. The flow effect was evaluated for several modes and Mach numbers. A comparison between acoustic fields inside the duct for several studied cases showed that the direction and the amplitude of the flow may affect on the attenuation of the acoustic pressure inside lined ducts.
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