Xiaoyang JI, Ming DONG, Lei ZHAO

DOI Number: N/A

Conference number: HiSST-2025-071

In this paper, we propose a new concept that delays laminar-turbulent transition in hypersonic boundary layers by stabilising fundamental resonance (FR), which is a key nonlinear mechanism when oblique perturbations undergo rapid growth supported by the finite-amplitude Mack modes. As a pioneering demonstration, a surface heating is applied exclusively during the nonlinear phase. Unlike traditional control methods that target the linear phase, the stabilising effect on secondary instability modes during FR is evident across various Reynolds numbers, wall temperatures and fundamental frequencies, as confirmed by direct numerical simulations and secondary instability analyses. To gain deeper insights into this control concept, an asymptotic model is developed, revealing that the suppression effect of FR is primarily influenced by modifications to the fundamental-mode profile, while mean-flow distortion has a comparatively modest yet opposing impact on this process. This research presents a promising approach to controlling transition considering the nonlinear evolution of boundary-layer perturbations, demonstrating advantages over conventional methods that are sensitive to frequency variations.

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In Categories: 1.Events, 1.HiSST 2025, Hypersonic Fundamentals & History
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