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Title: | Thermochemical nonequilibrium effects on high-enthalpy double-wedge flows | Authors: | Hong, Q Hao, J Uy, KCK Wen, CY Sun, Q |
Issue Date: | Jun-2022 | Source: | Physics of fluids, June 2022, v. 34, no. 6, 63607 | Abstract: | A hypersonic laminar flow over double wedges with a fixed forward angle of 15° and varied aft angles is studied using computational fluid dynamics and global stability analysis (GSA) at a free-stream Mach number of 12.82 and a total enthalpy of 21.77 MJ/kg. The specific total enthalpy is high enough to trigger evident vibrational excitation and air chemistry. To assess the effects of thermal and chemical nonequilibrium, three different thermochemistry models of air are considered, including frozen, thermal nonequilibrium, and thermochemical nonequilibrium gases. Two-dimensional base-flow simulations indicate that the onset of incipient and secondary separation is insensitive to the inclusion of thermochemistry, although the size of the separation region is substantially reduced. GSA is then performed on the base flows and identifies a three-dimensional stationary global instability beyond a critical aft angle, which is also insensitive to thermochemical nonequilibrium. The criterion of the global stability boundary established for the supersonic flow over compression corners in a calorically perfect gas in terms of a scaled deflection angle [Hao et al., "Occurrence of global instability in hypersonic compression corner flow,"J. Fluid Mech. 919, A4 (2021)] is, thus, extended to high-enthalpy conditions. | Publisher: | American Institute of Physics | Journal: | Physics of fluids | ISSN: | 1070-6631 | EISSN: | 1089-7666 | DOI: | 10.1063/5.0094929 | Rights: | © 2022 Author(s). This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Qizhen Hong (洪启臻), Jiaao Hao (郝佳傲), Ken Chun Kit Uy (黃駿傑), Chih-Yung Wen (温志湧), and Quanhua Sun (孙泉华), "Thermochemical nonequilibrium effects on high-enthalpy double-wedge flows", Physics of Fluids 34, 063607 (2022) and may be found at https://dx.doi.org/10.1063/5.0094929 |
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