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紧密栅结构对氦氙混合气体流动换热的影响研究
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Abstract:
以氦氙(He-Xe)混合气体为冷却剂的布雷顿循环气冷堆被视为兆瓦级空间能源系统中最合理的技术之一。紧密栅具有功率密度高、质量小、结构紧凑等优点，非常适用于气冷空间堆堆芯结构。本研究对He-Xe气体混合物在紧密栅棒束通道内的流动传热进行了CFD数值模拟，得到了紧密栅通道中的速度和温度场分布；比较了不同栅径比条件下He-Xe混合气体在紧密栅棒束通道内的流动换热性能参数。结果表明，随着栅径比的增加，紧密栅棒束通道的局部努塞尔数和摩擦阻力系数均为先增加后减少，其中栅径比为1.25时的总努塞尔数最大；综合换热性能的评价标准随着栅径比的变化先增加后减小，在5种栅径比中P/D = 1.15最佳。
The Brayton cycle gas-cooled reactor with helium-xenon (He-Xe) gas mixture as coolant is regarded as one of the most reasonable technologies for megawatt-scale space energy systems. Compact rod bundle has the advantages of high-power density, low mass and compact structure, which is very suitable for gas-cooled space core structure. In this study, the CFD numerical simulation of the flow and heat transfer of He-Xe gas mixture in compact rod bundle channel was carried out, and the velocity and temperature field distributions in the compact rod bundle were obtained. The flow and heat transfer performance parameters of He-Xe mixed gas in rod bundle channels were compared under different pitch-diameter ratios. The results show that with the increase in pitch-diameter ratio, the local Nusselt number and frictional factor of compact rod bundle channels increase first and then decrease, and the total Nusselt number is the largest when the pitch-diameter ratio is 1.25. The evaluation criterion of comprehensive heat transfer performance increases first and then decreases with the change in pitch-diameter ratio, and P/D = 1.15 is the best among the five grid-diameter ratios.
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