Three-dimensionality of hypersonic laminar flow over a double cone

نویسندگان

چکیده

Hypersonic laminar flow over a canonical 25°–55° double cone is studied using computational fluid dynamics and global stability analysis (GSA) with free-stream Mach number of 11.5 various unit Reynolds numbers. Axisymmetric simulations reveal that secondary separation occurs beneath the primary bubble beyond critical number. The numerical results agree well existing experiments triple-deck theory axisymmetric effect on incoming boundary layer treated by Mangler transformation. GSA identifies three-dimensional instability azimuthally periodic immediately prior to emergence separation. criterion onset in terms scaled deflection angle established for supersonic compression corner flows (Hao et al. , J . Fluid Mech. vol. 919, 2021, A4) can be directly applied double-cone flows. As further increased, strongly destabilized coexistence multiple stationary low-frequency oscillating unstable modes. Direct confirm supercritical intrinsically three-dimensional, unsteady exhibits strong azimuthal variations peak heating.

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ژورنال

عنوان ژورنال: Journal of Fluid Mechanics

سال: 2022

ISSN: ['0022-1120', '1469-7645']

DOI: https://doi.org/10.1017/jfm.2021.1137