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The subharmonic acoustic radiation of a tone excited subsonic jet shear-layer has been investigated experimentally. Two jet velocities Uj=20 m⋅s−1 and Uj=40 m⋅s−1 were studied. For Uj=20 m⋅s−1, the natural boundary-layer at the nozzle exit is laminar. When the perturbation is applied, the fluctuations of the first and the second subharmonics of the excitation frequency are detected in the shear-layer...
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