| 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)
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| Corresponding Author | Han, Guilai([email protected]) |
| Source Publication | APPLIED THERMAL ENGINEERING
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| 2023-01-05 | |
| Volume | 218Pages:11 |
| ISSN | 1359-4311 |
| Abstract | 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. |
| Keyword | Coaxial thermocouples Lateral heat conduction Maximum temperature point Optimal design Numerical simulation |
| DOI | 10.1016/j.applthermaleng.2022.119388 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000875735900004 |
| WOS Keyword | SURFACE JUNCTION THERMOCOUPLES ; FLUX MEASUREMENT ; TEMPERATURE ; CONDUCTION ; BODY ; TIME |
| WOS Research Area | Thermodynamics ; Energy & Fuels ; Engineering ; Mechanics |
| WOS Subject | Thermodynamics ; Energy & Fuels ; Engineering, Mechanical ; Mechanics |
| Funding Project | National Key Research and Devel-opment Program of China ; National Natural Science Foundation of China ; [2019YFA0405204] ; [2016YFA0401201] ; [12132017,11872066] ; [11727901] |
| Funding Organization | National Key Research and Devel-opment Program of China ; National Natural Science Foundation of China |
| Classification | 一类 |
| Ranking | 1 |
| Contributor | Han, Guilai |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/90490 |
| Collection | 高温气体动力学国家重点实验室 |
| Affiliation | 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 |
| Recommended Citation 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.Rp_Au:Han, Guilai |
| 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. |
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| Jp2023Fa039.pdf（5274KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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