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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。
In order to support the EU 2 × 2 fuel assemblies into the reactor assessment experiments carried out within the 2 × 2 bundle of supercritical water heat transfer experiments. Two experimental sections were designed, and the two processes were separated by rectangular metal frames. The 2 × 2 heating rod bundle is installed in the metal frame through the positioning grid, the supercritical water flows down through the first process and then enters the second process to cool the heating rod, the first process absorbs the heat of the second process fluid through the metal frame, and the temperature Rise. Significant circumferential temperature distribution inhomogeneities exists in the 2 × 2 rod cross-section. The effects of experimental parameters including mass flow rate, heat flux and experimental pressure on the average heat transfer coefficient of the bundle were systematically analyzed. The results show that the influence of system parameters on the heat transfer of the bundle is consistent with that of the single tube and the loop tube.