Development of a stagnation streamline model for thermochemical nonequilibrium flow | |
Hong QZ(洪启臻)1,2; Wang XY(王小永)2; Hu Y(胡远)2; Sun QH(孙泉华)1,2 | |
刊名 | PHYSICS OF FLUIDS |
2020-04 | |
卷号 | 32期号:4页码:046102 |
关键词 | Hypersonic |
ISSN号 | 1070-6631 |
DOI | 10.1063/5.0003247 |
英文摘要 | A stagnation streamline model incorporating quantum-state-resolved chemistry is proposed to study hypersonic nonequilibrium flows along the stagnation streamline. This model is developed by reducing the full Navier–Stokes equations to the stagnation streamline with proper approximations for equation closure. The thermochemical nonequilibrium is described by either the state-to-state approach for detailed analysis or conventional two-temperature models for comparison purpose. The model is validated against various data, and nearly identical results are obtained as compared with those from full field computational fluid dynamics data. In addition, the calculated distributions agree well with the measurement data of a shock tube experiment for the dissociation and vibrational relaxation of O2, including the distributions of species mole fractions and vibrational temperature of the first excited state of O2 molecules. Furthermore, the results with the state-resolved chemistry show that the flow within a shock layer exhibits a strong thermochemical nonequilibrium behavior, which is beyond the capability of commonly used two-temperature models to correctly evaluate the dissociation rate and the associated reaction energy. The present model is also employed to calculate the nonequilibrium re-entry flow along the stagnation streamline for a five-species air mixture as an example to demonstrate the model capability. It is found that both species and internal energy are in a nonequilibrium state, especially the vibrational distributions are strongly deviated from the Boltzmann distribution right behind the bow shock and near the wall surface. The results demonstrate that the proposed stagnation streamline model is very useful to understand thermochemical nonequilibrium phenomena in hypersonic flows. |
分类号 | 一类/力学重要期刊 |
资助项目 | Strategic Priority Research Program of the Chinese Academy of Sciences[XDA17030100] ; National Natural Science Foundation of China[11372325] |
WOS关键词 | DISSOCIATION COUPLING MODELS ; STATE VIBRATIONAL-RELAXATION ; THERMAL RATE CONSTANTS ; STAND-OFF DISTANCE ; ENERGY-TRANSFER ; HYPERSONIC FLOW ; RATES ; KINETICS ; OSCILLATOR ; SIMULATION |
WOS研究方向 | Mechanics ; Physics |
语种 | 英语 |
WOS记录号 | WOS:000524279900001 |
资助机构 | Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China |
其他责任者 | sun qh |
内容类型 | 期刊论文 |
源URL | [http://dspace.imech.ac.cn/handle/311007/81651] |
专题 | 力学研究所_高温气体动力学国家重点实验室 |
通讯作者 | Sun QH(孙泉华) |
作者单位 | 1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China; |
推荐引用方式 GB/T 7714 | Hong QZ,Wang XY,Hu Y,et al. Development of a stagnation streamline model for thermochemical nonequilibrium flow[J]. PHYSICS OF FLUIDS,2020,32(4):046102. |
APA | Hong QZ,Wang XY,Hu Y,&Sun QH.(2020).Development of a stagnation streamline model for thermochemical nonequilibrium flow.PHYSICS OF FLUIDS,32(4),046102. |
MLA | Hong QZ,et al."Development of a stagnation streamline model for thermochemical nonequilibrium flow".PHYSICS OF FLUIDS 32.4(2020):046102. |
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