DEMO堆包层第一壁热工水力优化分析研究

Optimization of analysis of DEMO-HCSB first wall based on thermal-hydraulic

聚变堆包层第一壁是影响包层换热效率与运行安全性最重要的部件,为了研究第DEMO堆包层第一壁的热工水力性能,对第一壁流道内氦气冷却剂的流动及其与结构材料的换热进行了数值模拟研究及优化分析。结果表明,通过增大氦气进口质量流量可以有效地降低第一壁结构材料的最高温度,但是由此带来的压力损失很大,不能作为强化换热的主要途径。此外,增加每组流道的盘绕次数能起到强化换热的效果,目前每组流道盘绕五次的方案是合理的。流道中存在的圆角包层第一壁的流动换热影响不大,但圆角的存在会使第一壁最高温度有一定的升高。铍涂层的导热系数与第一壁最高温度成反相关关系,但是对第一壁流道的对流换热影响不大。结构材料的导热系数的增大能显著降低第一壁结构材料的最高温度。

The first wall（FW） of fusion reactor blanket is an important component to the heat transfer efficiency and operational safety of the reactor.Therefore,thermalhydraulic performance of the FW in DEMO-HCSB is simulated and optimization analysis is conducted using the general purpose computational fluid dynamics（CFD） code FLUENT.By increasing the mass flow of inlet helium,the maximum temperature of structure material of FW reduces significantly while the pressure drop of the helium increases rapidly.It enhances heat transfer performance of FW that increasing the frequency of channel passing through FW in each circuit.There is little influence on thermal-hydraulic performance of FW when it comes to the 3 mm fillet of channel while the maximum temperature of structure material of FW increases with the fillet.The higher thermal conductivity of Beryllium armor leads the lower maximum temperature,which has little influence on the thermal-hydraulic performances of FW.By increasing the thermal conductivity of the structural material can significantly reduce the maximum temperature of the FW.