基于辐照与热流固耦合的反应堆金属反射层温度分析

Temperature Analysis for Metal Reflector Based on Irradiation and Thermal-Fluid-Structure Coupling

金属反射层在反应堆压力容器内受辐照和热流作用,其温度分布是一个复杂的热流固耦合问题。为了更准确地模拟金属反射层的温度分布,本文在考虑辐照释热影响的基础上提出了基于三维模型的热-流体耦合与热-固体耦合相结合的分析方法,通过流体稳态热分析和结构稳态热分析迭代计算,获得金属反射层的温度分布及自然对流换热系数。与现有方法相比,该分析方法在分析过程中施加的边界条件更全面,计算结果更可靠。

The metal reflector is influenced by irradiation and heat flow in the reactor pressure vessel, thus its temperature analysis is a complicated thermal-fluid-structure coupling problem. In order to simulate the temperature distribution of the metal reflector more accurately, the heat generation rate caused by irradiation is taken into account. Then a method based on thermal-fluid coupling and thermal-structure coupling is proposed in this paper. The method utilizes an iteration of fluid steady-state thermal analysis and structure steady-state thermal analysis to compute the temperature distribution of the metal reflector and the natural convection heat transfer coefficient. Compared with the results of the existing method, the results of the method in this paper is more reliable for more boundary conditions are applied in the calculation.