一种基于动网格的反应堆控制棒落棒行为分流域耦合仿真方法  

A Multi-field Method for Dynamic Simulation of Rod Dropping Behavior Based on Dynamic Mesh

作　　者：莫锦涛 方浩宇[1] 陈训刚[1] 颜达鹏 李长香[1] 邓朝俊 牛昊轩 MO Jin-tao;FANG Hao-yu;CHEN Xun-gang;YAN Da-peng;LI Chang-xiang;DENG Chao-jun;NIU Hao-xuan(Nuclear Power Institute of China,Chengdu,Sichuan Prov.610213,China)

机构地区：[1]中国核动力研究设计院,四川成都610213

出　　处：《中国核电》2020年第3期328-332,共5页China Nuclear Power

摘　　要：本文提出了一种基于动网格的反应堆控制棒落棒行为分流域耦合仿真方法,该方法分别建立了控制棒单棒和驱动杆的二维轴对称模型,保证控制棒和驱动杆对应流域的网格能够根据落棒运动规律自适应地变化。两个流域在每个时间步长内交换流体阻力计算结果,并根据运动方程求解得到的速度来更新控制棒和驱动杆的运动状态,实现分流域耦合。该方法通用性好,计算中考虑了驱动线流道形状的影响,且在计算时间和求解精度之间取得了良好的折中,此外,该方法在计算条件允许的情况下,还能较容易地扩展到三维模型。本文采用该方法对典型反应堆驱动线落棒行为进行了仿真,仿真结果表明,该方法计算结果可信。A multi-field method for dynamic simulation of rod dropping behavior based on dynamic mesh is proposed in this paper.Two-dimensional axisymmetric models of the control rod and drive rod are established respectively and the mesh of the control rod and drive rod flow field can change adaptively according to the rod dropping behavior.The calculated fluid resistance is exchanged between the two flow fields at each time step and the motion of the control rod and drive rod is updated according to the velocity obtained by solving the motion equation,thus establishing the multi-field coupling.This method has good generality and the influence of flow channel shape is considered in the calculation.Besides,agood compromise is achieved between calculation time and solution accuracy.The method can be easily extended to 3 Dmodel when the computational conditions permit.In this paper,the typical rod dropping behavior is simulated by using this method and the simulation results show that the method is reliable.

关 键 词：分流域 耦合 动网格 驱动线落棒 

分 类 号：TM623[电气工程—电力系统及自动化]