基于动网格技术的单根控制棒落棒行为仿真分析

Simulation and Analysis of Single Control Rod Dropping Behavior Based on Dynamic Grid Technique

以某小型反应堆控制棒驱动线为研究对象,建立了单根控制棒三维流体仿真模型。基于动网格技术对控制棒落棒行为进行了仿真分析,获得了控制棒落棒过程中导向管内流场的压力云图、速度云图以及控制棒位移、速度-时间曲线和导向管内压强-时间曲线。与相应试验数据的对比验证表明,仿真结果与试验结果符合很好。该方法可用来计算控制棒落棒时间及最大冲击力等重要参数,为控制棒驱动线结构优化设计提供参考。

A smart nuclear reactor control rod drive line was used as the research object, and a 3-D fluid simulation model of single control rod dropping was set up. Velocity and pressure nephogram in the guide tube were obtained by simulating the control rod dropping behavior based on dynamic grid technique, and the displacement cure, velocity cure and pressure cure were obtained as well. Comparison of the simulation and experiment results showed that the simulation results were in good agreement with the experimental results. Some important parameters can be calculated by this method, such as the time of control rod dropping process and the maximum imoact force, so it can provide references for the design of control rod drive line structure.