本文对小型加速器驱动的次临界系统(ADS)-PDS-XADS散裂靶进行了热工水力分析.分析的XADS型实验堆基于欧洲PDS-XADS实验项目的设计,使用铅铋合金(LBE)作为冷却剂.散裂靶是ADS的核心部件之一,用以确保反应堆功率维持在指定水平.本文利用计算流体力学软件ANSYSCFX 11.0对散裂靶的下部区域进行热工水力分析.分析采用稳态计算、剪切应力输运(SST)湍流模型,在壁面边界条件处采用自动壁面函数法,针对不同的散裂靶设计进行计算流体力学(CFD)分析,最后根据散裂靶设计限值选择最优设计方案.%The thermal-hydraulic analysis of PDS-XADS spallation target for 80 MW reactor core power was studied. PDS-XADS is a small scale experimental accelerator driven sub-critical system (ADS). The analysis presented in this paper was based on lead bismuth eutectic (LBE) cooled XADS type experimental reactors, which are the designs of the European experimental PDS-XADS project. The spallation target is a very important component of ADS because it is responsible to keep the reactor power at the required level by spallation reactions. A high rate of neutron production by spallation reaction creates the problem of decay heat cooling. LBE flow is properly cooled, but the window is not properly cooled because of the stagnation point in the pole of the window. It would be very difficult to keep the window temperature below the design limit, which is an important design limit challenge. Thermal-hydraulic analysis of LBE spallation target was carried out by using ANSYS CFX 11.0. The detailed CFD analysis, which reveals thermal and hydraulic conditions in the window and spallation region, was carried out for different spallation target designs. Finally, the spallation target design limit was used to choose the best design.
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