【摘要】 从传热学角度计算了热电偶在测量管道温度时其自身的温度分布,提出了影响热电偶测温精度的关键因素。研究了管道内流体温度场对热电偶测温精度的影响,分析了热电偶保护管插入深度与测量误差的关系,通过实例计算给出了确定热电偶保护管合理插入深度的方法,并给出了电力行业中几种常见工况下热电偶的插入深度计算结果。更多还原

【Abstract】 The temperature distribution of a thermocouple which is applied to measurement of the temperature of a fluid in a pipe was computed based on the heat transfer theories,and the key factors affecting the temperature measurement accuracy were presented.The influence of the fluid’s temperature distribution in the pipe on the thermocouple’s measurement accuracy was studied,and the relationship between the insertion depth of the thermocouple’s thermowell in the pipe and the measurement error was analyzed.Then,a method for determining a rational insertion depth for a thermocouple was put forward based on example computions,and the results of computing the thermocouple insertion depth in industrial applications under several actual measurement conditions were given.更多还原