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中文摘要：
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。
英文摘要：
Aiming to support the design and construction of CLEAR-I, a series hydraulic experiments were performed in KYLIN-II forced circulation thermal-hydraulic loop. In this paper, the flow resistance experiments of full scale fuel assembly were performed. It could be concluded that the pressure drop of the fuel assembly showed a good agreement compared to the experimental results with reactor design value. The maximum relative deviations were only around 6%. The friction factor of the wire-wrapped rod bundle was also measured and compared to the empirical relationship and former experimental results performed in water loop. The results showed that the Novendstern model was more suitable for this rod bundle than Rehme model, and the relative deviation is around 14%. Based on the Reynolds similarity, the friction factor results in water were larger than the values in LBE. That is because at the same Reynolds number, the secondary flow induced by helical wires in water was stronger than that in LBE.
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