具有外套管的释热元件表面温度求解

为进行具有外套管的释热元件的性能分析，需准确计算元件包壳外侧的温度分布。由于套管结构内外均存在流体，传热情况较为复杂，因此本文基于传热基本方程和能量守恒关系，设计开发了专用的迭代算法和计算程序求解该结构温度分布，并采用典型算例，将计算结果与Fluent软件仿真结果进行对比。结果表明，本文程序计算结果与Fluent软件仿真结果的相对误差小于5%。基于本算法编写的程序模块与燃料元件性能分析程序相耦合，可提高燃料性能分析流程的独立性。

Surface Temperature Calculation of Heat Generation Element with Outer Casing

In order to carry out the performance analysis of the heat generation element with outer casing, it is necessary to calculate accurately the outer surface temperature distribution of the element cladding. Due to the existence of fluid inside and outside the casing structure, the heat transfer situation becomes more complicated. Therefore, based on basic equations of heat transfer and the law of energy conservation, a special iterative algorithm and corresponding code were developed to solve the temperature distribution under this structure. Moreover, the code results were compared with results of Fluent simulation using a typical example. It shows that the relative error between results from the code and Fluent is within 5%. The module based on this algorithm can be coupled with the fuel performance code and promote the efficiency and accuracy of the analysis process.