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Role of a Single Shield in Thermocouple Measurements in Hot Air Flow 被引量:2

Role of a Single Shield in Thermocouple Measurements in Hot Air Flow
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摘要 To investigate the role of a single shield on steady temperature measurement using therrnocouples in hot air flow, a methodology for solving convection, conduction, and radiation in one single model is provided. In order to compare with the experimental results, a cylindrical computational domain is established, which is the same size with the hot calibration wind-tannel. In the computational domain, two kinds of thermocouples, the bare-bead and the single-shielded thermocouples, are simulated respectively. Surface temperature distribution and the tempera- ture measurement bias of the two typical thermocouples are compared. The simulation results indicate that: 1) The existence of the shield reduces bead surface heat flux and changes the direction of wires inner heat conduction in a colder surrounding; 2) The existence of the shield reduces the temperature measurement bias both by improving bead surface temperature and by reducing surface temperature gradient; 3) The shield effectively reduces the effect of the ambient temperature on the temperature measurement bias; 4) The shield effectively reduces the influence of airflow velocity on the temperature measurement bias.
出处 《Journal of Thermal Science》 SCIE EI CAS CSCD 2017年第6期523-532,共10页 热科学学报(英文版)
基金 supported by the National Natural Science Foundation of China(Grant No.51776011)
关键词 single-shield bare-bead thermocouples temperature measurement fluid-solid conjugated heat transfer. 温度测量 屏蔽作用 热电偶 热空气 表面温度分布 测量偏差 低环境温度 空气流量
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