Optimal design of E-type coaxial thermocouples for transient heat measurements in shock tunnels

doi:10.1016/j.applthermaleng.2022.119388

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

	Optimal design of E-type coaxial thermocouples for transient heat measurements in shock tunnels
	Qi L(齐力); Han GL(韩桂来)1; Jiang ZL(姜宗林)
刊名	APPLIED THERMAL ENGINEERING
	2023-01-05
卷号	218 页码:11
关键词	Coaxial thermocouples Lateral heat conduction Maximum temperature point Optimal design Numerical simulation
ISSN号	1359-4311
DOI	10.1016/j.applthermaleng.2022.119388
通讯作者	Han, Guilai(hanguilai@imech.ac.cn)
英文摘要	Coaxial thermocouples have been widely used for transient heat transfer measurements in high-enthalpy shock tunnels. The one-dimensional semi-infinite heat conduction theory is typically used for temperature data pro-cessing. However, lateral heat transfer occurs due to material differences between the two electrodes and the junction, causing a deviation in the heat flux measurement from the prediction results of the one-dimensional semi-infinite heat conduction theory. Thus, the lateral heat conduction effect should be investigated to improve the accuracy and reliability of heat flux measurements. In this paper, the heat transfer in E-type (Chromel-Constantan) coaxial thermocouples was analyzed by numerically solving the two-dimensional axisymmetric heat conduction equation with the Du Fort-Frankel scheme. The maximum temperature point on the surface of the coaxial thermocouples shifted to the positive electrode during the heating process. The numerical simulation indicated that the surface temperature of the coaxial thermocouples and the derived heat flux were larger than the theoretical value. The heat flux measurement error of the coaxial thermocouples can be reduced by increasing the width of the positive electrode. Hence, 13 combinations of the diameters of positive electrode and negative electrode were designed for analysis. With the increase of positive electrode diameter or decrease of negative electrode, the heat flux measurement error kept on decreasing, which can be lower than 0.5% in some cases. The results of this study can provide a reference for the design and optimization of coaxial thermocouples.
分类号	一类
资助项目	National Key Research and Devel-opment Program of China ; National Natural Science Foundation of China ; [2019YFA0405204] ; [2016YFA0401201] ; [12132017,11872066] ; [11727901]
WOS关键词	SURFACE JUNCTION THERMOCOUPLES ; FLUX MEASUREMENT ; TEMPERATURE ; CONDUCTION ; BODY ; TIME
WOS研究方向	Thermodynamics ; Energy & Fuels ; Engineering ; Mechanics
语种	英语
WOS记录号	WOS:000875735900004
资助机构	National Key Research and Devel-opment Program of China ; National Natural Science Foundation of China
其他责任者	Han, Guilai
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/90489]
专题	力学研究所_高温气体动力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Qi L,Han GL,Jiang ZL. Optimal design of E-type coaxial thermocouples for transient heat measurements in shock tunnels[J]. APPLIED THERMAL ENGINEERING,2023,218:11.
APA	齐力,韩桂来,&姜宗林.(2023).Optimal design of E-type coaxial thermocouples for transient heat measurements in shock tunnels.APPLIED THERMAL ENGINEERING,218,11.
MLA	齐力,et al."Optimal design of E-type coaxial thermocouples for transient heat measurements in shock tunnels".APPLIED THERMAL ENGINEERING 218(2023):11.