Abstract
The amount of quantitative experimental data, devoted to mechanisms of transformation of vortical free-stream disturbances into cross-flow (CF) instability modes is very restricted. The present experimental investigation is a continuation and subsequent development of studies [1, 2, 5, 6]. Problems of the localized vortical receptivity of a swept-wing boundary layer were examined previously for cases of scattering of freestream vortices by surface nonuniformities [5] and surface vibrations [6]. The distributed vortical receptivity concerning excitation of the CF-waves by streamwise freestream vortices on a smooth surface was investigated in [1, 2]. In the present study, the surface was not smooth but had controlled spanwise-uniform long-wavelength roughness (waviness). Based on a developed technique, values of coefficients of the distributed vortex-roughness receptivity are obtained experimentally for the first time. Dependences of these coefficients on parameters of the base flow instability, freestream vortices, and surface waviness have been investigated.
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References
Borodulin, V., Ivanov, A., Kachanov, Y.: Distributed recepticity of swept-wing boundary layer to streamwise vortices. Part 1. Experimental approach. In: V. Fomin (ed.) Proc. 15th Int. Conf. Methods of Aerophysical Research. ITAM SB RAS, Novosibirsk (2010)
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Borodulin, V.I., Ivanov, A.V., Kachanov, Y.S., Mischenko, D.A., Fedenkova, A.A.: Comparison of distributed vortex receptivity coefficients at excitation of 3D TS-waves in presence and absence of surface waviness and pressure gradient. AIP Conf. Proc. 1770, 030041–1–030041–7 (2016)
Borodulin, V.I., Ivanov, A.V., Kachanov, Y.S., Roschektayev, A.P.: Receptivity coefficients at excitation of cross-flow waves by free-stream vortices in the presence of surface roughness. J. Fluid Mech. 716, 487–527 (2013). https://doi.org/10.1017/jfm.2012.555
Borodulin, V.I., Ivanov, A.V., Kachanov, Y.S., Roschektayev, A.P.: Receptivity coefficients at excitation of cross-flow waves due to scattering of free-stream vortices on surface vibrations. J. Fluid Mech. 793, 162–208 (2016). https://doi.org/10.1017/jfm.2016.129
Acknowledgements
This study is supported by the Boeing Operations International, Inc. and the Program of Fundamental Scientific Research of the Russian state academies of sciences in 2013–2020 (Project No. AAAA-A17-117030610128-8).
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Borodulin, V.I., Ivanov, A.V., Kachanov, Y.S. (2022). Distributed Excitation of Crossflow Waves Due to Scattering of Freestream Vortices by Surface Waviness. 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_28
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DOI: https://doi.org/10.1007/978-3-030-67902-6_28
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