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The analysis of thermocouple time constants as a function of fluid velocity

机译：热电偶时间常数与流体速度的关系分析

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摘要

In steady-state conditions when the fluid temperature is constant, there is no damping and time lag so the temperature measurement can be performed with a high accuracy. But when the fluid temperature is varying rapidly as during the start-up, quite appreciable differences occur between the exact and measured temperature because of the time required for the transfer of heat to the thermocouple placed inside a thermometer pocket. The temperature of the fluid is one of the key parameters affecting the proper operation of thermodynamic cycles, so the precise determination of its value is very important. The speed of the response of control systems to a temperature change is closely related to the time constant of the used thermocouples. The paper presents a significant impact of fluid velocity changes (in this case air) on the value of time constants of thermometers. For this purpose, the experimental study was carried out using sheathed thermometers with different diameters and hot junctions. The time constants determined for various thermometers are compared.
机译：在稳态条件下，当流体温度恒定时，没有阻尼和时滞，因此可以高精度进行温度测量。但是，当流体温度在启动过程中迅速变化时，由于热量传递到放置在温度计口袋中的热电偶所需要的时间，在精确温度和测量温度之间会出现相当明显的差异。流体温度是影响热力循环正常运行的关键参数之一，因此精确确定其值非常重要。控制系统对温度变化的响应速度与所用热电偶的时间常数密切相关。本文提出了流体速度变化（在这种情况下为空气）对温度计时间常数值的重大影响。为此，使用具有不同直径和热接点的护套温度计进行了实验研究。比较为各种温度计确定的时间常数。

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