The character of hydrodynamic disturbances in the near-wall shear flow inducing self-oscillations in the channel has been investigated. Experiments have been performed in a small and a large wind tunnel at a flow velocity of 10–40 m / sec. It has been found that excitation of self-oscillations becomes possible as a result of narrow-band acoustic radiation generation by not only vortex formations but also large-scale coherent structures in the region of the laminar-turbulent transition and in the turbulent boundary layer.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 82, No. 6, pp. 1113–1117, November–December, 2009.
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Karavosov, R.K., Prozorov, A.G. Hydrodynamic structures — elements of the self-sustained oscillation system in the flow. J Eng Phys Thermophy 82, 1132–1137 (2009). https://doi.org/10.1007/s10891-010-0307-5
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DOI: https://doi.org/10.1007/s10891-010-0307-5