Measurement error of tracer-based velocimetry in single-phase turbulent flows with inhomogeneous refractive indices

doi:10.1016/j.expthermflusci.2022.110681

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Measurement error of tracer-based velocimetry in single-phase turbulent flows with inhomogeneous refractive indices
	Li, Huixin 4; Fischer, Andreas 1,2; Avila, Marc 1,4; Xu, Duo 3,4
刊名	EXPERIMENTAL THERMAL AND FLUID SCIENCE
	2022-08-01
卷号	136 页码:12
关键词	Measurement error Tracer-based velocimetry Inhomogeneous refractive index Ray tracing simulation
ISSN号	0894-1777
DOI	10.1016/j.expthermflusci.2022.110681
通讯作者	Xu, Duo(duo.xu@imech.ac.cn)
英文摘要	Inhomogeneous refractive index fields lead to errors in optical flow velocity measurements. Former respective studies are mostly in quasi two-dimensional flows, and attribute the measurement errors to spatial gradients in the refractive index field, while less attention has been paid to flows with three-dimensional refractive index fields which usually change in space and in time. In this study, ray tracing simulations were carried out in a three-dimensional flow, which is from a direct numerical simulation of single-phase turbulent mixing of two fluids. Given the data of the numerical simulation as reference, the ray tracing simulation is used to quantify the measurement errors of the flow velocity and flow acceleration for tracer-based velocimetry, i.e. particle tracking velocimetry in this study. The errors of both flow velocity and flow acceleration are attributed to the spatial and the spatio-temporal gradients of the refractive indices, respectively, which are closely inherited from flow characteristics. While the dominant type of error depends on the studied flow, the main measurement error for the considered turbulent mixing flow is caused by the random error. When the maximum spatial difference of the refractive indices is about 10-6, the relative random measurement error is about 1 % in velocity and about 200 % in acceleration, respectively. When the maximum index difference is about 10(-2) (water), the relative random measurement errors of velocity and acceleration are 2000 % and 105 %, respectively, for the flow considered in this study.
资助项目	China Scholarship Council[CSC201804930530]
WOS关键词	PARTICLE ; DISTORTION ; MODEL ; PIV
WOS研究方向	Thermodynamics ; Engineering ; Physics
语种	英语
WOS记录号	WOS:000804592800005
资助机构	China Scholarship Council
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/89697]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Xu, Duo
作者单位	1.Univ Bremen, MAPEX Ctr Mat & Proc, D-28359 Bremen, Germany 2.Univ Bremen, Bremen Inst Metrol Automat & Qual Sci BIMAQ, D-28359 Bremen, Germany 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 4.Univ Bremen, Ctr Appl Space Technol & Micrograv ZARM, D-28359 Bremen, Germany
推荐引用方式 GB/T 7714	Li, Huixin,Fischer, Andreas,Avila, Marc,et al. Measurement error of tracer-based velocimetry in single-phase turbulent flows with inhomogeneous refractive indices[J]. EXPERIMENTAL THERMAL AND FLUID SCIENCE,2022,136:12.
APA	Li, Huixin,Fischer, Andreas,Avila, Marc,&Xu, Duo.(2022).Measurement error of tracer-based velocimetry in single-phase turbulent flows with inhomogeneous refractive indices.EXPERIMENTAL THERMAL AND FLUID SCIENCE,136,12.
MLA	Li, Huixin,et al."Measurement error of tracer-based velocimetry in single-phase turbulent flows with inhomogeneous refractive indices".EXPERIMENTAL THERMAL AND FLUID SCIENCE 136(2022):12.