Investigation of high enthalpy thermochemical nonequilibrium flow over spheres

doi:10.1063/5.0186418

CORC > 力学研究所 > 中国科学院力学研究所 > 高温气体动力学国家重点实验室

	Investigation of high enthalpy thermochemical nonequilibrium flow over spheres
	Guo, Jinghui; Wang XY(王小永); Li, Sijia
刊名	PHYSICS OF FLUIDS
	2024
卷号	36 期号:1 页码:10
ISSN号	1070-6631
DOI	10.1063/5.0186418
通讯作者	Wang, Xiaoyong(wangxy@imech.ac.cn)
英文摘要	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.
分类号	一类/力学重要期刊
资助项目	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
WOS关键词	LAYER INTERACTIONS ; SHOCK STANDOFF ; MODELS ; OXYGEN ; SIMULATIONS ; DISTANCE
WOS研究方向	Mechanics ; Physics
语种	英语
WOS记录号	WOS:001141218300018
资助机构	National Natural Science Foundation of China10.13039/501100001809 ; National Natural Science Foundation of China
其他责任者	Wang, Xiaoyong
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/94207]
专题	力学研究所_高温气体动力学国家重点实验室
推荐引用方式 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.
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.