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Title:
On the response of coaxial surface thermocouples for transient aerodynamic heating measurements
Author: Li JP(李进平); Chen H(陈宏); Zhang SZ(张仕忠); Zhang XY(张晓源); Yu HR(俞鸿儒)
Source: EXPERIMENTAL THERMAL AND FLUID SCIENCE
Issued Date: 2017-09-01
Volume: 86, Pages:141-148
Abstract: Surface thermocouples are widely used in transient aerodynamic heating measurements but their response often exhibits uncertainty and unpredictability resulting in poor accuracy of measurement. To address this issue and provide reference information on their fabrication the response of coaxial surface thermocouples was investigated numerically and experimentally. From the numerical simulations it was observed that the heat blocking effect of the insulation layer can change the response of a thermocouple which strongly depends on the structure of the junction at short test times. Nevertheless with increasing time the response tends to be independent of the junction and be consistent with the prediction of the commonly used one-dimensional heat conduction model. Owing to the difficulty in controlling the junction these observations not only account for the uncertainty and unpredictability of the response but also suggest that for ensuring accurate measurements a sufficiently long test time is necessary. The simulation also shows that the response of a thermocouple is insensitive to the properties of the insulation layer and that the duration of an uncertain response decreases dramatically with the thickness of the layer. To improve the performance of a surface thermocouple additional effort should be directed at reducing the thickness of the insulation layer rather than enhancing its thermal properties. The shock tube experiments confirmed the achieved numerical results and demonstrated a practical calibration technique for heat transfer gauges. (C) 2017 Elsevier Inc. All rights reserved.
Keyword: Heat flux measurement ; Thermocouple ; Response characteristics ; Shock tube
Language: 英语
Indexed Type: SCI ; EI
DOI: 10.1016/j.expthermflusci.2017.04.011
DOC Type: Article
WOS Subject: Thermodynamics ; Engineering, Mechanical ; Physics, Fluids & Plasmas
WOS Subject Extended: Thermodynamics ; Engineering ; Physics
WOS Keyword Plus: JUNCTION THERMOCOUPLES ; FLUX
WOS ID: WOS:000401883900013
ISSN: 0894-1777
Funder: National Natural Science Foundation of China(11472280)
First Institution (Yes or Not): true
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/60531
Appears in Collections:高温气体动力学国家重点实验室_期刊论文

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Recommended Citation:
Li JP,Chen H,Zhang SZ,et al. On the response of coaxial surface thermocouples for transient aerodynamic heating measurements[J]. EXPERIMENTAL THERMAL AND FLUID SCIENCE,2017-09-01,86:141-148.
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