Vojtech PEZLAR, Anton BURTSEV, Vassilios THEOFILIS

DOI Number: N/A

Conference number: HiSST-2025-117

Local and global stability analyses and direct numerical simulations are performed to study unresolved questions on laminar-turbulent transition mechanisms that condition performance of the HIFiRE-1 and ROTEX-T flight vehicles at hypersonic flight conditions. Conditions at which the Mack mode is stable on the conical forebodies preceding the compression (on the ROTEX-T) and expansion (on the HIFiRE-1) regions on the vehicles are identified and the BiGlobal eigenvalue problem in these regions is solved under physically admissible homogeneous Dirichlet inflow boundary conditions. The global eigenmodes responsible for unsteadiness on the flare of the two vehicles are then identified, alongside several stationary and traveling members of the global eigenspectra. Axisymmetric direct numerical simulations provide evidence of linear destabilization of the flow on the ROTEX-T vehicle as the Reynolds number is systematically increased. Three-dimensional direct numerical simulations of a quarter- and the full ROTEX-T vehicle, both at zero angle of attack, have produced identical unsteady flowfields, a result which points at the unsteadiness on the vehicle arising from linear global instability originating at the reattachment zone of the laminar separation bubble formed at the flare.

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In Categories: 1.Events, 1.HiSST 2025, High-Speed Aerodynamics and Aerothermodynamics with application to hypersonic regimes
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