中文摘要：

在分析钢水连续测温传感器传热过程的基础上,建立了传感器的二维轴对称非线性非稳态传热模型。采用有限元方法对钢水连续测温传感器的动态测温过程进行了仿真研究,并分析了传感器插入深度、热物性参数、预热温度、边界条件等因素对测温准确性和动态特性的影响。实验结果表明,仿真值与测量值相比最大误差小于5℃,所建模型是正确的。传感器的插入深度及其变化率对动态测温误差、测量响应速度,测温的准确性均有较大的影响,其最小插入深度应为250 mm。传感器动态测温误差随着热容或密度的增大而增大,随着导热系数的增大而减小。传感器初始预热温度每提高10℃,最大动态测温误差减小约5℃,响应时间缩短约2s。这些结果可为传感器的优化设计和实际使用提供理论依据。

英文摘要：

Based on analyzing the heat transfer of continuous temperature measurement sensor for liquid steel, the 2-D axi-symmetric nonlinear unsteady model is developed, and the dynamic temperature measurement process of the sensor is studied using finite element simulation method. The factors that influence temperature measurement accuracy and dynamic characteristics, such as inserting depth, thermo-physical properties, preheating temperature and boundary conditions are analyzed. The experiment results show that the established models are correct, the maximum error between measurement value and simulation value is less than 5 ℃. The inserting depth has great effects on dynamic measurement error, response speed and accuracy; the minimum depth must be 250 mm. The dynamic measurement error increases with the increasing of heat capacity or density, and decreases with the increasing of conductivity. When the preheating temperature increases 10℃, the maximum dynamic measurement error reduces 5 ℃ and the response time decreases 2 s. These results provide a theoretical basis for sensor optimum design and practical application.