| Investigation of high enthalpy thermochemical nonequilibrium flow over spheres | |
| Guo, Jinghui; Wang XY(王小永); Li, Sijia | |
| Corresponding Author | Wang, Xiaoyong([email protected]) |
| Source Publication | PHYSICS OF FLUIDS
 |
| 2024 | |
| Volume | 36Issue:1Pages:10 |
| ISSN | 1070-6631 |
| Abstract | The hypersonic high enthalpy nitrogen flows over spheres are investigated by high-fidelity state-to-state (StS) modeling. The objective of the study is to understand the nonequilibrium behaviors in the shock layer, including the stagnation line features, surface heat transfer rate, and near-wall properties inside the thermal boundary layer. Two cases with the freestream total enthalpies of 16.5 and 15.5 MJ/kg are considered, and the numerical results are compared with the experimental data. The StS model yields an accurate prediction of the shock stand-off distance with the experiment rather than an underestimation by the traditional two-temperature model. Both the StS and two-temperature models provide general agreement of the stagnation point heat flux with the experiment. In comparison, the heat flux obtained by the StS model is lower than the two-temperature model. Note that our work finds distinctive behaviors of near-wall properties. The vibrational energy is not accommodated with the sphere surface and is in thermal nonequilibrium with the translational energy, with evidence showing that the vibrational temperature is much higher than the wall temperature and the translational temperature. The values of vibrational temperature in the immediate vicinity of the stagnation point are 9.3 and 10.0 times the wall temperature for the cases with total enthalpies of 16.5 and 15.5 MJ/kg, respectively. Moreover, the vibration temperature demonstrates a nonmonotonic variation trend with a local minimum, which can be explained by the nonequilibrium distributions of vibrational energy states due to vibrational-translational energy transfer and molecular recombination. |
| DOI | 10.1063/5.0186418 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001141218300018 |
| WOS Keyword | LAYER INTERACTIONS ; SHOCK STANDOFF ; MODELS ; OXYGEN ; SIMULATIONS ; DISTANCE |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Project | National Natural Science Foundation of China10.13039/501100001809[12102025] ; National Natural Science Foundation of China10.13039/501100001809[12002348] ; National Natural Science Foundation of China10.13039/501100001809[030810-ZG216S2312] ; National Natural Science Foundation of China |
| Funding Organization | National Natural Science Foundation of China10.13039/501100001809 ; National Natural Science Foundation of China |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | Wang, Xiaoyong |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/94208 |
| Collection | 高温气体动力学国家重点实验室 |
| Recommended Citation GB/T 7714 | Guo, Jinghui,Wang XY,Li, Sijia. Investigation of high enthalpy thermochemical nonequilibrium flow over spheres[J]. PHYSICS OF FLUIDS,2024,36,1,:10.Rp_Au:Wang, Xiaoyong |
| APA | Guo, Jinghui,王小永,&Li, Sijia.(2024).Investigation of high enthalpy thermochemical nonequilibrium flow over spheres.PHYSICS OF FLUIDS,36(1),10. |
| MLA | Guo, Jinghui,et al."Investigation of high enthalpy thermochemical nonequilibrium flow over spheres".PHYSICS OF FLUIDS 36.1(2024):10. |
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