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Weak Non-Parallel Effects on Chemically-Reacting Hypersonic Boundary-Layer Stability

par Zanus, Ludovico ;Miró Miró, Fernando ;Pinna, Fabio
Référence (17-21 June 2019: Dallas), AIAA Aviation Forum
Publication Publié, 2019-06-21

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Résumé :

Advancing towards the correct modeling and subsequent understanding of laminar-to-turbulenttransition during atmospheric reentry is paramount for the future of aerospacetechnology. The coexistence of multiple physical phenomena and the grand amount of conditioningfactors require the progressive extension of the applicability capabilities of the theoreticalmodels. Past efforts have been mostly dedicated to investigate high-temperature andnon-equilibrium effects using parallel stability theories. However, the implications of couplingthese thermochemical phenomena with non-parallelism remains uncertain. Advanced stateof the art thermodynamic and transport models are employed both in parallel and weaklynon-parallel stability theories (LST and LPSE). A parametric study about the influence of nonlocaleffects under different re-entry conditions and flow assumptions (i.e. CPG, TPG, CNEand LTE) showed that non-parallel effects stabilize/destabilize the boundary-layer, dependingon the altitude and independently from the gas model employed. Particularly, they lead to astronger destabilization of the 2nd Mack mode at the earliest points of the atmospheric re-entryflight envelope, reducing their effect until being weakly stabilizing at the lowest altitudes. DrasticN factor increments occurred assuming LTE, due to the presence of unstable supersonicmodes, promoted by the boundary-layer cooling, caused by the intense chemical activity.