Ming DONG, Lei ZHAO

DOI Number: N/A

Conference number: HiSST-2025-126

This work is motivated by the unresolved influence of nose bluntness on hypersonic boundary-layer transition. Linear stability theory explains why small increases in bluntness delay transition, but it cannot account for the reversal of this trend at larger bluntness. This reversal is believed to arise from the growth of non-modal perturbations, yet their receptivity to freestream disturbances has not been quantified. In this paper, we introduce a highly efficient shock-fitting harmonic linearized Navier-Stokes (SF-HLNS) method to quantify non-modal perturbation receptivity. We show that this receptivity mechanism plays the dominant role in the transition-reversal phenomenon. By coupling SF-HLNS with nonlinear parabolized stability equations and secondary-instability analysis, we accurately predict the onset of transition across a range of nose radii. Comparison with experimental data confirms both the reliability and efficiency of our theoretical framework.

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