Density estimation of an ultrahigh-speed rarefied flow field based on force analysis of a pendulum sphere

doi:10.1016/j.vacuum.2023.111919

	Density estimation of an ultrahigh-speed rarefied flow field based on force analysis of a pendulum sphere
	Han N(韩宁); Cao JW(曹进文); Meng X(孟显); Liu HL(刘宏立); Zhang SH(张少华); Huang HJ(黄河激)
发表期刊	VACUUM
	2023-05
卷号	211 页码:111919
ISSN	0042-207X
摘要	The similarity criterion for high speed or high enthalpy rarefied reaction flows is the binary scaling law, one of which is the product of the incoming flow density and the characteristic scale of the test model in a rarefied wind tunnel should be equal to that under the flight condition. This is to ensure that the ratio between the charac-teristic distance of the relaxation process and the characteristic length of the body is equal. However, in a rarefied wind tunnel, it is difficult to directly measure the flow density below 10-5 kg/m3 using common methods due to the relatively high rarefied degree, an indirect density estimation method based on force analysis of a pendulum sphere was proposed in this study. The oscillation trajectory of the pendulum sphere under ultrahigh-speed rarefied flow conditions was recorded and the corresponding aerodynamic drag force acted on the sphere along the trajectory was analyzed, based on which the density distribution of the flow was then estimated combined with DSMC simulations. The obtained results show that in the present study, the flow is in under-expanded condition and the measured density sharply decreased from 10-6 kg/m3 to 10-7 kg/m3 at 140-170 mm from the nozzle outlet.
关键词	Density estimation Pendulum sphere Force analysis Ultrahigh-speed rarefied flow
DOI	10.1016/j.vacuum.2023.111919
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000990960400001
项目资助者	Strategic Priority Research Program of the Chinese Academy of Sciences [XDA17030100] ; National Natural Science Foundations of China [11735004, 11575273] ; Hainan Province Science and Technology Special Fund [ZDKJ2019004]
论文分区	二类
力学所作者排名	1
RpAuthor	Cao, JW
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/92224
专题	高温气体动力学国家重点实验室
作者单位	1.(Han Ning, Cao Jin-Wen, Meng Xian, Liu Hong-Li, Zhang Shao-Hua, Huang He-Ji) Chinese Acad Sci Inst Mech State Key Lab High Temp Gas Dynam 15 Beisihuanxi Rd Beijing 100190 Peoples R China 2.(Han Ning, Cao Jin-Wen, Huang He-Ji) Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China
推荐引用方式 GB/T 7714	Han N,Cao JW,Meng X,et al. Density estimation of an ultrahigh-speed rarefied flow field based on force analysis of a pendulum sphere[J]. VACUUM,2023,211:111919.Rp_Au:Cao, JW
APA	韩宁,曹进文,孟显,刘宏立,张少华,&黄河激.(2023).Density estimation of an ultrahigh-speed rarefied flow field based on force analysis of a pendulum sphere.VACUUM,211,111919.
MLA	韩宁,et al."Density estimation of an ultrahigh-speed rarefied flow field based on force analysis of a pendulum sphere".VACUUM 211(2023):111919.

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