环形通道内定位格架对超临界水传热的影响

摘要

定位格架对棒束内流动传热具有极重要的影响，目前定位格架对超临界水传热的影响仍无相应的试验数据。本文基于上海交通大学完成的超临界水在环形通道内的对流传热试验，评价了传统定位格架对下游传热系数衰减关联式的适用性。试验结果表明，定位格架的面积阻塞比对格架下游传热系数衰减规律有很大影响；在超临界压力与次临界压力条件下，定位格架下游传热系数衰减规律也有较大的差异。%The spacer grid has a great impact on convective heat transfer in rod bundles . So far ,there is still no experiment data corresponding to the effect of spacer grid on heat transfer to supercritical water .Based on the convective heat transfer experiment with supercritical water in annular pipe in SJTU ,the traditional correlations’ applicability was evaluated in this paper .The experiment results show that the attenuation law of heat transfer coefficient in the dow nstream locations is influenced by the block ratio of spacer grid greatly . Compared with subcritical pressure , the attenuation law of the dow nstream heat transfer coefficient has different forms at supercritical pressure .