Stability of time-periodic flow with laminar boundary-layer separation |
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Authors: | A V Boiko A V Dovgal A M Sorokin |
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Institution: | 1.Khristianovich Institute of Theoretical and Applied Mechanics SB RAS,Novosibirsk,Russia;2.Tyumen State University,Tyumen,Russia |
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Abstract: | The influence of the low-frequency modulation of flow behind a rectangular backward-facing step on the amplitude characteristics of disturbances in the separated laminar boundary layer has been studied. The experimental data were obtained by the method of hot-wire anemometry in a wind tunnel at a low subsonic velocity. Response of the separated flow to the long-wave oscillations generated by a local source of disturbances on the surface of the experimental model was clarified. The low-frequency nonstationarity of the separation region leads to a growth of velocity fluctuations in the separated boundary layer, which dominate the laminar-turbulent transition and the state of the flow in the near-wall region. |
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