论文部分内容阅读
采用非结构化多面体网格,利用商业软件STARCCM+6.04对标准型定位格架对超临界水在反应堆堆芯子通道内流动及传热特性的影响进行了数值研究。研究结果表明,由于流动阻塞效应的影响,燃料棒覆层表面温度周向分布不均,窄缝区最高、中心区最低。标准定位格架能够强化定位格架内部传热,但会造成其下游局部传热弱化,周向温度分布差异增大,不利于降低覆层温度。标准型定位格架下游的传热弱化现象或许是超临界反应堆紧凑型堆芯的特有现象,须在堆芯设计中加以重视。
An unstructured polyhedral mesh was used to study the influence of standard positioning grid on the flow and heat transfer characteristics of supercritical water in the reactor core sub-channel by the commercial software STARCCM + 6.04. The results show that due to the effect of flow blockage, the surface temperature distribution of fuel rod cladding is unevenly distributed, with the highest in the narrow zone and the lowest in the center. The standard positioning grid can strengthen the heat transfer inside the positioning grid, but it will cause the weakening of the local heat transfer in the downstream and the greater difference in the circumferential temperature distribution, which is unfavorable to reducing the coating temperature. The weakening of the heat transfer downstream of the standard positioning grid may be a characteristic of the compact core of a supercritical reactor and must be taken into account in the core design.