Abstract
The paper presents the first results of an experimental study of a new effective control mechanism of evolution of fast-growing unsteady Görtler modes by modifying the base flow (the boundary layer on a concave surface) by means of quasi-steady (physically steady) Görtler vortices of finite amplitude. It is found that this mechanism is able to strongly suppress growth rates of the disturbances under control. The suppression efficiency depends on the phase relations between the control and controlled perturbations, but does not depend on amplitudes of the latter.
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References
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Acknowledgements
This work is supported by the Russian Science Foundation (project No. 17-71-10179).
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Mischenko, D.A., Borodulin, V.I., Ivanov, A.V., Kachanov, Y.S. (2022). Control of Unsteady Görtler Instability Modes by Steady Görtler Vortices. In: Sherwin, S., Schmid, P., Wu, X. (eds) IUTAM Laminar-Turbulent Transition. IUTAM Bookseries, vol 38. Springer, Cham. https://doi.org/10.1007/978-3-030-67902-6_19
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DOI: https://doi.org/10.1007/978-3-030-67902-6_19
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