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基于KYLIN-II热工强迫循环实验回路,对CLEAR-I单盒燃料组件1:1模型组件在铅铋介质中的流动阻力特性进行实验研究。研究表明:组件整体压降实验值与设计值吻合较好,相对偏差在6%以内。对绕丝棒束段的摩擦阻力系数与Novendstern、Rehme公式进行对比,Novendstern模型更适用于本实验棒束结构的压降计算;基于雷诺相似准则与前期水介质下的阻力系数对比,发现相同雷诺数下水介质下的阻力系数明显偏大,其原因为相同雷诺数下绕丝在水介质中引起的二次横流强度大于铅铋介质下的情况。
Based on the KYLIN-II thermal forced circulation experimental loop, the flow resistance characteristics of 1: 1 model CLEAR-I module fuel assemblies in lead-bismuth media were experimentally studied. The results show that the experimental values of the overall pressure drop of the module are in good agreement with the designed values, and the relative deviation is within 6%. Compared with the Novendstern and Rehme formulas, the friction drag coefficient of the wire bundle segment is more suitable for the pressure drop calculation of the rod bundle structure in this experiment. Based on the comparison between the Reynolds similarity criterion and the resistance coefficient of the pre-water medium, the same Reynolds number The coefficient of resistance under several submerged media is obviously larger, because the secondary cross-flow intensity caused by the wire around the wire under the same Reynolds number is larger than that under lead-bismuth media.