低雷诺数绕丝组件摩擦阻力研究

Research of Frictional Resistance of Wire-wrapped Assembly at Low Reynolds Number

钠冷快堆在事故紧急停堆后,经过堆芯的一回路自然循环是堆芯燃料组件冷却的唯一途径,因此准确的预测自然循环条件下堆芯内钠流的流动和温度分布对钠冷快堆非能余热排出系统的设计具有重要意义。采用不同的绕丝棒束组件摩擦阻力计算关系式,使用子通道分析方法,对37棒燃料组件内流动与传热进行了模拟,并将模拟结果与实验数据对比,发现子通道分析方法采用UCTD公式时有着较好的准确性,且随着流速的增大,钠流内的流动交混是不可忽视的。

After the emergency shutdown of sodium cooled fast reactor,the natural circulation of the primary loop through the core is the only way to cool the core fuel.Therefore,it is significant to accurately predict the flow and temperature distribution of sodium flow in the core under the natural circulation conditions to design the passive decay heat removal system of the sodium cooled fast reactor.We used subchannel analysis method and different formula for calculating friction resistance of wire-wrapped assembly to simulate the flow and temperature distribution in a 37 rods fuel assembly.Then we compared the simulation results with experimental data and found that the subchannel code has good accuracy with UCTD formula.As the sodium flow velocity increases,the mix in sodium flow cannot be ignored.