Abstract
Under the low-noise Mach 3 flight conditions for a supersonic passenger aircraft having unswept wings with a thin parabolic airfoil, laminar-turbulent transition is due to amplification of the first mode. Stability of a local self-similar boundary layer over such a wing is investigated both using the \(e^{N}\) method in the framework of linear stability theory and direct numerical simulation (DNS). It is found that the instability amplitude should reach a maximum over the entire spectral range above the profiles of 2.5% and thicker. The locus of maximum appears at the trailing edge and moves to the leading edge as the profile becomes thicker, while the maximum amplitude decreases. The theoretical findings are supported by DNS of the linear wave packets propagating in the boundary layer. Significance of these results to the design of laminar supersonic wings is discussed.
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Acknowledgements
The authors are grateful to Anton Obraz (senior researcher of TsAGI and MIPT) for stability calculations using the boundary layer profiles extracted from DNS solution.
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The work has been carried out at MIPT under the support of Russian Science Foundation (Project No. 19-79-10132).
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Chuvakhov, P.V., Ilyukhin, I.M. & Fedorov, A.V. Stability of supersonic boundary layer over an unswept wing with a parabolic airfoil. Theor. Comput. Fluid Dyn. 38, 1–13 (2024). https://doi.org/10.1007/s00162-023-00680-z
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DOI: https://doi.org/10.1007/s00162-023-00680-z