基于分离变量法的瞬态高温外推测试研究

An Extrapolation Measuring Method for Transient High-Temperature Based on Separation of Variables

提出了一种利用蓝宝石光纤黑体腔温度传感器外推测量高温的新方法,建立了测量瞬态高温的黑体腔外推模型,利用分离变量法对其求解.在此基础上,利用CO2激光器模拟瞬态高温热源,用传感器和高速红外测温仪同时测量黑体腔内外膜层温度变化情况.实验结果表明:利用分离变量法求得的外温度和红外测温仪测得的温度在变化趋势及峰值方面表现出了比较好的一致性,从而证明了外推模型的正确性.同时,利用Ansys软件对黑体腔的瞬态受热传热过程进行仿真,从反面验证了外推模型的正确性.

Based on sapphire optical fiber blackbody cavity temperature sensor, an extrapolation measuring method for transient high-temperature was presented. The mathematical model was established and solved by separation of variables. On this basis, by CO2 laser simulating the transient high-temperature heat source, the sensors and high-speed infrared thermometer were simultaneously used to measure the temperature change inside and outside the black body cavity film. The experimental results show that the extrapolation temperatures obtained by separation of variables are consistent with the temperatures detected by infrared thermometer in the change trendency and the peak value aspects, which proves the correctness of the extrapolation model. At the same time, Ansys software is used to simulate the transient heat transfer process of the blackbody cavity heated, which proves the correctness of extrapolation model in the opposite direction.