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对高温气冷堆核电厂示范工程HTR-PM的堆芯出口热气混合结构设计进行数值模拟,并考虑了未经过堆芯的冷却剂漏流的影响。对模拟计算所得的温度、压力以及流速分布的分析表明:热混合主要由与主流动方向垂直或平行的漩涡等二次流导致,且混合效果变化滞后于二次流的产生和变化;压降主要为由于流体流通面积和流动方向剧变而产生的局部压损,二次流的产生与变化伴随着压降的变化。计算分析的结果表明:在考虑漏流的额定流量工况下,HTR-PM的堆芯出口混合结构可以满足高热混合效率和低压降的要求。
The design of HTS-PM hybrid core-outlet hybrid structure was numerically simulated and the effects of coolant leakage without core were considered. The analysis of the temperature, pressure and velocity distribution of the simulated results shows that the thermal mixing is mainly caused by the secondary flow such as the vortex which is perpendicular or parallel to the main flow direction, and the mixing effect lags behind that of the secondary flow. The pressure drop Mainly due to the fluid flow area and the direction of the drastic changes in the local pressure loss, secondary flow generation and changes accompanied by changes in pressure drop. The results of the calculation and analysis show that the HTR-PM core-outlet hybrid structure can meet the requirements of high thermal mixing efficiency and low pressure drop under the rated flow conditions considering leakage.