论文部分内容阅读
反应堆燃料组件内冷却剂的混合效应,一般通过实验束测定。本文对化学示踪法的实验原理和数据处理过程作了扼要的叙述。试验是在一开式回路上用自来水作流体进行的,雷诺数范围为10000—50000。在试验组件上游进口端将LiNO_3溶液注入中央子流道,在其下游三个位置的中央子流道内取样,用光度计分析样品内锂离子的浓度变化。实验结果以贝克莱(Peclet)数给出。实验测得光棒束内的贝克莱数平均值为0.007,此值与国外早先报道的结果基本相吻合。对装有定位格架的棒束,实验测得的贝克莱数平均值为0.018,约为光棒束的2.5倍。
The mixing effect of the coolant in the reactor fuel assembly is generally determined by the experimental beam. In this paper, the experimental principle and data processing of chemical tracer method are briefly described. The test was run on tapped water with tap water, with a Reynolds number in the range of 10000-50000. LiNO_3 solution was injected into the central sub-flow channel at the upstream inlet of the test module and sampled in the central sub-flow channel at three locations downstream of the experimental module. The concentration of lithium ion in the sample was analyzed with a photometer. The experimental results are given in terms of the Peclet number. The average Beculare number in the light bundle measured by the experiment is 0.007, which is in good agreement with the results previously reported abroad. For the bundle with positioning grid, the average value of the experimentally measured Berkeley is 0.018, which is about 2.5 times that of the light bundle.