Hypersonic Boundary-Layer Instability and Transition upon Complex Geometries

A special issue of Aerospace (ISSN 2226-4310). This special issue belongs to the section "Aeronautics".

Deadline for manuscript submissions: 31 March 2026 | Viewed by 93

Special Issue Editor


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Guest Editor
School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: hypersonic aerodynamics; boundary layer Instability and transition; experimental fluid mechanics; flow control

Special Issue Information

Dear Colleagues,

Boundary-layer transition significantly impacts the aerodynamic and aerothermal design of hypersonic vehicles. Previous studies on hypersonic boundary-layer transition mainly focus on simple geometries, such as flat plate and sharp cones, and the underlying principle leading to transition is well-elaborated to some extent. On the contrary, the boundary-layer instability and transition mechanism upon complex geometries remains outstanding, preventing the further practical engineering application. This Special Issue focus on hypersonic instability and transition phenomenon on complex geometries, with special emphasis and interests on multi-modes interactions, surface curvatures, shock/wave interactions, flow control, etc. Therefore, the work on numerical simulation, experimental study as well as theoretical analysis all fall in the scope of this Special Issue. Hopefully, the content of this Special Issue might shed light on the practical application of hypersonic vehicles.

Prof. Dr. Jie Wu
Guest Editor

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Keywords

  • hypersonic flow
  • boundary-layer instability
  • transition
  • flow control
  • complex geometries

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Published Papers (1 paper)

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Research

24 pages, 10285 KB  
Article
Angle of Attack Effects on Boundary Layer Transition over a Flared Cone–Swept Fin Configuration
by Qingdong Meng, Juanmian Lei, Song Wu, Chaokai Yuan, Jiang Yu and Ling Zhou
Aerospace 2025, 12(9), 824; https://doi.org/10.3390/aerospace12090824 (registering DOI) - 12 Sep 2025
Abstract
In our previous study, the transition behavior of a flared cone–swept fin configuration was investigated under an angle of attack (AoA) of 0°. To further explore the role of AoA in complex three-dimensional geometries with strong fin–body interactions, wind tunnel experiments [...] Read more.
In our previous study, the transition behavior of a flared cone–swept fin configuration was investigated under an angle of attack (AoA) of 0°. To further explore the role of AoA in complex three-dimensional geometries with strong fin–body interactions, wind tunnel experiments were conducted at Ma = 9.3, Re = 1.36 × 107/m, with AoA ranging from −6° to 6°. Global surface temperature distributions were obtained using temperature-sensitive paint (TSP), while localized heat flux and pressure fluctuations were captured using thin-film thermocouples and high-frequency pressure sensors. The results show that varying AoA shifts the location of high heat flux between the upper and lower surfaces of the flared cone and induces a switch from streamwise to separation vortices. The windward side exhibits stronger disturbance responses than the leeward side. The junction region between the flared cone and the near-horizontal surface is highly sensitive to AoA variations, consistently exhibiting pronounced second-mode instabilities. These findings provide experimental support for understanding transition mechanisms under the combined effects of shock/boundary layer interaction (SBLI), crossflow, and adverse pressure gradients, with implications for transition prediction and thermal protection system design. Full article
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