Hence, the sound field due to rotating sources in turbomachines is of great interest, especially, in terms of sound absorbers. However, they are among the system components with the highest sound generation. Turbomachines, like axial fans or aircraft engines, are often used in direct vicinity of humans due to their applications in transportation, cooling and air-conditioning. This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. ![]() Those findings are useful, for example, to improve the acoustic absorption performance of sound absorbers and acoustic liners around turbomachines. It is shown, that the direction of the energy flow path differs from the radial direction and depends on the rotational direction and rotational velocity. ![]() Further, the direction of the time-averaged acoustic energy flow is derived from the acoustic intensity vectors. The advanced time approach is applied for sound sources at subsonic and supersonic rotation and yield comparable results as those obtained from the spherical harmonic series expansion method or the solution of the retarded time equation. We calculate the sound pressure, the acoustic velocity, as well as the instantaneous and time-averaged acoustic intensity fields with the advanced time approach. * Corresponding author: detailed study of the three-dimensional sound fields around a monopole point source in subsonic and supersonic rotation is investigated. Aalen University of Applied Sciences, 73430 Aalen, Germany
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