【摘要】 提出一种基于分离式热管技术的PCS水池长期非能动冷却方案，以实现安全壳在超出设计基准的事故工况下非能动排热。通过数值模拟研究了冷却水箱内的瞬态启动特性，讨论了管束布置、进口流量、进口距离对水箱内传热与流动的影响。结果表明，水箱内始终保持明显的热分层，不同位置处的蒸发管传热能力最大相差34.2%。随着进口流量从3.3 kg/s增加到10.0 kg/s,每个模块可以带走的热量也由0.353 MW增加到0.532 MW,压降由40.36 Pa增加到342.48 Pa;进口效应对正对进口位置及中间位置的管束影响较大。管束布置方式对水箱内的传热与流动影响很小。综合蒸发管传热量与压降的影响，进口位置到水池顶部距离h应当选择0.5 m。更多还原

【Abstract】 It proposes a long-term passive cooling scheme of passive containment heat removal system(PCS) water tank based on separate heat pipe technology to realize passive cooling of containment under accident conditions beyond the design basis. The transient start-up characteristics in the cooling water tank are studied by numerical simulation, and the effects of tube bundle arrangement, inlet flow and inlet distance on heat transfer and flow are discussed. The results show that obvious thermal stratification is always maintained in the water tank, and the maximum difference in the heat transfer capacity of the evaporation tubes at different positions is 34.2%. When the inlet flow increases from 3.3 kg/s to 10.0 kg/s, the heat that each module can take away increases from 0.353 MW to 0.532 MW, and the pressure drop increases from 40.36 Pa to 342.48 Pa. The inlet effect has a greater impact on the tube bundles facing the inlet position and the middle position. The arrangement of the evaporative tube bundles has little effect on the heat transfer and flow in the water tank; Considering the influence of heat transfer and flow in the evaporation tube, the inlet position h should be selected at 0.5 m.更多还原