Abstract
It is shown that reduction of broadband (even total) far-field jet noise can be achieved via controlled excitation of a jet at a frequency in the range 0.01 < St0 < 0.02, where Std is the Strouhal number based on the exit momentum thickness of the shear layer. Hot-wire measurements in the noise-producing region of the jet reveal that the noise suppression is a direct consequence of turbulence suppression, produced by early saturation and breakdown of maximally growing instability modes.
Original language | English |
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Pages (from-to) | 159-168 |
Number of pages | 10 |
Journal | Journal of Fluid Mechanics |
Volume | 150 |
DOIs | |
State | Published - Jan 1985 |