In the combined system of lead-cooled fast reactor and supercritical carbon dioxide (S-CO₂) Brayton cycle, the intermediate heat exchanger plays a key role in the whole power system. However, the existing heat exchanger cannot meet the trend of miniaturization of lead-cooled fast reactors. Considering the thermo-physical properties and heat transfer behaviors in both S-CO₂ and liquid lead bismuth eutectic are significantly different, an asymmetric compact coupled heat exchanger learning from the Honeycomb structure is proposed. Then the effect of the Reynolds number on the coupling heat transfer is discussed. When the Reynolds number of the cold side was changed from 57600 to 145000, the heat transfer coefficient of the heat exchanger increases by 79%, but when the Reynolds number on the hot side is changed from 29600 to 118000, the heat transfer coefficient only increases by 4.6%. To enhance the heat transfer and reduced thermal resistance on the S-CO₂ side, a wavy channel was used. The results showed that the wavy channels could significantly improve the field-synergy angle. In the smooth pipe, the averaged field-synergy angle is 88.7°, while in the wavy channel, the averaged field-synergy angle becomes 84.1° at α = 1.5. With the increase of wavy amplitude in S-CO₂ channel, the heat transfer coefficient and the friction factor increased, but the comprehensive heat transfer coefficient is in non-monotonic variation. The overall heat transfer coefficient of the wavy channel is 1.56-1.81 times than that of the straight channel in the range of Re_SCO2 = 86700 ~ 145000.

中文翻译：

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波形管结构对超临界二氧化碳铅铋共晶紧凑换热器综合性能的影响

在铅冷快堆与超临界二氧化碳（S-CO ₂）布雷顿循环联合系统中，中间换热器在整个动力系统中起着关键作用。然而，现有的换热器无法满足铅冷快堆小型化的趋势。_{考虑 S-CO 2}中的热物理性质和传热行为由于与液态铅铋共晶有显着的不同，因此借鉴蜂窝结构提出了一种非对称紧凑耦合换热器。然后讨论了雷诺数对耦合传热的影响。当冷侧雷诺数由57600改为145000时，换热器的传热系数增加了79%，但当热侧雷诺数由29600改为118000时，换热器传热系数仅增加4.6%。_{增强 S-CO 2}上的传热并降低热阻侧面，使用了波浪形通道。结果表明，波状通道可以显着提高场协同角。在光滑管道中，平均场协同角为88.7°，而在波状通道中，当α=1.5时，平均场协同角变为84.1°。_{随着S-CO 2}通道内波幅的增大，传热系数和摩擦系数增大，但综合传热系数呈非单调变化。_{在Re SCO2} =86700～145000范围内，波状通道的整体传热系数是直通道的1.56-1.81倍。