ADS散裂靶与次临界堆的耦合传热研究

Study on Coupled Heat Transfer Between ADS Spallation Target and Subcritical Reactor

对ADS液态铅铋靶与铅基次临界堆之间进行了热耦合,研究了在靶堆间是否加入阻热层、阻热层的热导率和厚度、加入气体阻热层时气体的压力对靶堆间热流量的影响。研究发现,加入阻热层可以减少耦合后靶堆间的热流量,气体阻热层有显著降低热流量的效果,允许靶和堆中铅铋的流速以及靶堆间的温差在更大范围内波动。靶堆间传递的热流量与阻热材料的热导率成正比,与阻热层厚度成反比,气体阻热层厚度可以选择在0.06到0.08 m之间。气体阻热层的压力在0.1到10 Pa区间内,热流量随压力的变化显著。因此,气体阻热层压力可以选择在0.1 Pa左右。

Through the thermal coupling between ADS liquid lead bismuth target and lead based subcritical reactor,this paper studies the effect of whether a thermal barrier layer is added between the target and the reactor,the thermal conductivity and thickness of the layer,and when a gas thermal barrier layer is added,gas pressure on the heat flow between target and reactor.The study found that adding a thermal barrier layer can reduce the heat flow after coupling.Adding a gas layer can significantly reduce the heat flow,and allow the flow velocity of lead-bismuth in both target and reactor and the temperature difference between target and reactor to fluctuate over a wider range.The heat flow is proportional to the thermal conductivity of the thermal barrier layer and inversely proportional to the thickness of the layer.The thickness of the gas layer can be selected between 0.06 m and 0.08 m.The pressure of the gas thermal barrier is in the range of 0.1 to 10 Pa,and the heat flow varies significantly with the pressure.Therefore,the pressure of the gas thermal barrier layer can be selected to be about 0.1 Pa.