Abstract
The dipole noise sources due to the interaction of a turbulent jet flow and a solid circular cylinder mounted at right angles aross the jet axis are modelled in terms of the incident turbulence and the unsteady forces on the cylinder. The radiated sound varies approximately with the sixth power of velocity and with the minus fourth power of distance from the nozzle when the cylinder is located beyond the initial and transition regions of the jet. Transverse force fluctuations were found to predominate in producing a dipole source distribution along the cylinder, oriented at right angles to it and to the flow. The force fluctuations were strongly influenced by the ratio of cylinder diameter to turbulence integral scale, reducing as this ratio passed through the range near unity in the present experiments. Spectra and the scaling of the radiated sound indicate that the time scale associated with the dipole mechanism is determined by the cylinder diameter and by local velocity. The sound produced showed no evidence of discrete Aeolian tones, and was broadband in nature with a maximum at a Strouhal number in the range of 0·32-0·40, based on local maximum (centreline) velocity and cylinder diameter.
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