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http://hdl.handle.net/10397/88404
Title: | Numerical investigation of oxygen thermochemical nonequilibrium on high-enthalpy double-cone flows | Authors: | Hao, J Wen, CY |
Issue Date: | Dec-2018 | Source: | International journal of heat and mass transfer, Dec. 2018, v. 127, part. B, p. 892-902 | Abstract: | Hypersonic thermochemical nonequilibrium flows over a double-cone configuration are numerically investigated. Simulations with oxygen as the test gas are performed using different coupling models of vibrational excitation and dissociation, including a conventional two-temperature model as the baseline and an improved model established on elementary kinetics and validated against existing shock tube experimental data. For the condition with the highest total enthalpy, the improved model predicts a larger separation region and greater peak heat flux with relative differences of 20.3% and 29.2%, respectively, compared with the baseline two-temperature model. The differences are attributed to inaccurate modeling of the vibration–dissociation coupling effects by the conventional two-temperature model, which overestimates the post-shock degree of dissociation and underestimates the post-shock temperature. The size of the separation bubble is therefore altered due to the change in its density. These findings may help to explain the large discrepancies found between numerical results and experimental data for high-enthalpy double-cone flows in hypersonic studies. | Keywords: | Hypersonic flow Shock-wave/boundary-layer interaction Thermochemical nonequilibrium Vibration–dissociation coupling |
Publisher: | Pergamon Press | Journal: | International journal of heat and mass transfer | ISSN: | 0017-9310 | EISSN: | 1879-2189 | DOI: | 10.1016/j.ijheatmasstransfer.2018.07.132 | Rights: | © 2018 Elsevier Ltd. All rights reserved. © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. |
Appears in Collections: | Journal/Magazine Article |
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