基于RELAP5的汽轮机仿真模型研究

Study of Turbine Simulation Model Based on RELAP5

建立了一个能准确反映级内部非等熵过程及动态运行特性的汽轮机模型,并将其加载到RELAP5程序中,完成RELAP5汽轮机模型的改进。改进的汽轮机模型是基于级内蒸汽的流动和做功特点,充分考虑了汽轮机结构参数以及汽轮机湿蒸汽流的非平衡两相凝结而形成的凝结冲波现象的影响。通过RELAP5程序内部耦合接口的建立和输入处理子程序的修改,实现了汽轮机模型的加载。以秦山一期300MW核电厂汽轮机部件为对象,分别利用原RELAP5汽轮机模型和改进的汽轮机模型对其进行稳态和动态的仿真计算和比较分析。结果表明,改进的汽轮机模型能更准确地反映汽轮机动态运行特性。

The turbine model which can represent accurately non-isentropic process in the stage of turbine and system dynamic characteristics was developed and added into RELAP5 code ,and the improvement of the turbine model of RELAP5 was implemen-ted .The improved turbine model is based on the characteristics of steam flow and work transfer in the stage of turbine and considers adequately the impact of internal configura-tion parameters and oblique shock which is developed by non-equilibrium condensation of wet steam in turbine .Through building internal coupling interface and the modifying input processing subroutines ,turbine model was developed as a part of RELAP5 hydro-dynamic model . Taking the turbine of Qinshan 300 MW Nuclear Power Plant as an example ,the simulation calculation and comparative analysis were performed for both stead and dynamic cases respectively by both the original and the modified turbine mod-els in RELAP5 code .The results show that the modified turbine model can represent more accurately the dynamic operation characteristics of the turbine .