铅铋流动漩涡脱落研究

Lead-Bismuth Flow Vortex Shedding Research

摘要: 管路中，如果发生漩涡脱落现象，将会造成传热管损坏、破裂，对整个回路安全性造成不良影响。基于瑞典TALL回路的各项参数，以及漩涡脱落频率的定义式：，对铅铋回路换热器管路进行计算，得到了漩涡脱落频率与来流速度、管道直径、斯特罗哈数之间的关系。计算结果表明：1) 管道直径越大，发生漩涡脱落的频率越小。2) 来流速度越大，发生漩涡脱落频率的概率越大。3) 斯特罗哈数越大，发生漩涡脱落频率的概率越大。 In the pipeline, if the phenomenon of the vortex shedding occurs, it will cause the heat transfer tube damage and rupture, and cause a great impact on the whole circuit safety. Based on the parameters of Sweden TALL loop and the defined type of the vortex shedding frequency: , to calculate the Pb-Bi loop heat exchanger pipeline, we can get the relationship between the vortex shedding frequency and the flow velocity, pipe diameter, Castro HA. The results show that: 1) When the pipe diameter is larger, the vortex shedding frequency is smaller. 2) As the flow velocity is increasing, the probability of occurrence of the vortex shedding frequency is greater. 3) The larger the Castro HA number is, the bigger the probability of occurrence of the vortex shedding frequency is.