带绕丝2×2棒束超临界水传热实验研究

针对两流程带绕丝定位的2×2棒束实验本体，开展了超临界水的流动传热实验研究。实验结果表明，在带绕丝的2×2棒束中，同一横截面上存在显著的周向温度不均匀现象。在较小的G/q工况下出现传热恶化现象，且存在二次恶化现象。由于绕丝的搅混作用，流道下游的传热恶化得到抑制。实验表明，棒束传热规律与单管类似，对比结果指出Bishop等（1964）的计算公式能较好地预测实验结果。同时与不带格架的2×2棒束相比，绕丝具有强化传热的作用。

Experimental Study on Heat Transfer of Supercritical Water in 2 × 2 Rod Bundle with Wrapped Wire

Heat transfer of supercritical water in a 2 × 2 rod bundle with wrapped wire and two channels was investigated experimentally .The non‐uniformity of circumferen‐tial wall temperature distribution in heating rods was observed .The heat transfer dete‐rioration (HTD) occurred at low G/q in whole rod bundle region while the secondary HTD was observed close to the upstream .The HTD at downstream was restrained due to the disturbance of wrapped wire .The studies show that the heat transfer behavior is similar to that in single tube . T he correlation of Bishop et al . (1964 ) gives the best prediction of Nusselt number .Compared with a 2 × 2 bare rod bundle ,the w rapped wire strengthens heat transfer .