A numerical study of the hole-tone phenomenon subjected to non-axisymmetric shape perturbations of the jet nozzle

作者：Langthjem Mikael A^*; Nakano Masami

来源：Theoretical and Computational Fluid Dynamics, 2015, 29(3): 127-153.

DOI：10.1007/s00162-015-0343-z

• Aeroacoustics
• Self-sustained flow oscillations
• Three-dimensional vortex method
• Vortex sound
• Boundary element method
• Flow control

This paper presents a numerical analysis of the hole-tone phenomenon (Rayleigh's bird-call), based on a three-dimensional discrete vortex method. Evaluation of the sound generated by the self-sustained flow oscillations is based on the Powell-Howe theory of vortex sound and a boundary integral/element method. While the fundamental problem can be modeled well under the assumption of axial symmetry, the purpose of employing a full three-dimensional model is to investigate the influence of non-axisymmetric perturbations of the jet on the sound generation (with a view to flow control). Experimentally, such perturbations can be applied at the jet nozzle via piezoelectric or electro-mechanical actuators, placed circumferentially inside the nozzle at its exit. In the mathematical/numerical model, this is simulated by wave motions of a deformable nozzle. Both standing and traveling (rotating) waves are considered. It is shown that a considerable reduction of the sound generation is possible.

• 出版日期2015-6