On the influence of non equilibrium in the free stream conditions of high enthalpy oxygen flows around a double-cone. (December 2022)

• Record Type: Journal Article
• Authors: Ninni, Davide; Bonelli, Francesco; Colonna, Gianpiero; Pascazio, Giuseppe
• Is Part Of: Acta astronautica. Volume 201(2022)
• Page Start: 247
• Page End: 258
• Publication Date: 2022-12
• Subjects: Hypersonic flows -- Thermochemical non-equilibrium -- State-to-State kinetics -- Double-cone -- Shock wave/boundary layer interaction -- Catalytic wall; Astronautics -- Periodicals; Outer space -- Exploration -- Periodicals; Astronautics; Periodicals; 629.405
• DOI: 10.1016/j.actaastro.2022.09.017
• Languages: English
• ISSNs: 0094-5765

Abstract

Abstract: This work presents a detailed analysis of the shock wave/boundary layer interaction in hypersonic flows around a double-cone. Numerical simulations have been carried out by solving the axisymmetric Navier–Stokes equations for an oxygen mixture. Thermochemical non-equilibrium is taken into account by employing the multi-temperature model (mT) proposed by Park and the State-to-State model (StS). The occurrence of surface processes is also analyzed considering both non-catalytic and fully-catalytic wall models. It is shown that the evaluation of correct free stream conditions is fundamental for the prediction of the separation extent and the corresponding heat transfer in high enthalpy conditions. Highlights: Thermochemical non equilibrium is relevant for high enthalpy double-cone flows. Numerical results are in good agreement with experiments for low enthalpy regimes. Discrepancies with experiments are found for high enthalpy regimes. Free stream conditions are strongly affected by non equilibrium. Improved results can be obtained if a state-to-state model is employed.