两流程2×2棒束超临界水传热实验研究

Experimental Study on Heat Transfer of Supercritical Water in 2×2 Rod Bundles with Two Paths

为支持欧盟2×2燃料组件入堆考核实验,开展了2×2棒束内超临界水传热实验研究。设计了两流程实验段,两流程之间通过矩形金属框隔离。2×2加热棒束通过定位格架安装在金属框中,超临界水通过第1流程向下流动然后进入第2流程冷却加热棒,第1流程通过金属框吸收第2流程流体的热量而温度升高。在2×2棒束横截面上存在明显的周向温度分布不均匀性。系统分析了实验参数包括质量流速、热流密度和实验压力对棒束平均换热系数的影响。结果表明,系统参数对棒束传热的影响规律与对单管和环管的一致。

An experiment on the heat transfer of supercritical water in a 2×2 rod bundles with two paths was carried out.The two paths were separated by a square metal frame,where water flowed downward in the first path and turned to flow upward in the second path.The 2×2heat rod bundles were installed in the second path,and cooled by the fluid flowing upward in the second path.The non-uniformity of circumferential wall temperature distribution in heat rod was observed.The effects of system parameters including mass flux,heat flux and pressure on the heat transfer were presented.The result shows that the heat transfer characteristics were similar to those observed in bare tube or annular tube.