Research on Hydraulic Performance of LFR Axial-flow Reacter Coolant Pump
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摘要: 为掌握铅铋介质在轴流式核主泵内的流动特性，通过计算流体力学（CFD）方法采用剪切应力输运（SST k-ω）湍流模型对铅铋介质和水介质进行瞬态数值计算，对比分析2种介质在叶轮和导叶计算域的能量变化及其规律。研究结果表明，工作介质雷诺数的改变对轴流式核主泵水力性能有明显影响，铅铋介质下主泵的扬程和效率均高于水介质。主泵在2种介质下理论扬程基本一致，但铅铋介质比水介质的实际扬程高出3%，表明2种介质差异主要体现在流动损失中；在对2种介质的水力损失形式的研究中发现，主泵在铅铋介质下的由摩擦引起的翼型损失小于水介质，并且铅铋介质的边界层分离点明显滞后。该研究可为LFR主泵水力设计提供一定参考。Abstract: In order to master the flow characteristics of lead-bismuth medium in axial-flow reactor coolant pump, the transient numerical calculation of lead-bismuth medium and water medium was carried out by computational fluid dynamics (CFD) method and shear stress transport (SST k-ω) turbulence model, and the energy changes and their laws of the two media in the calculation domain of impeller and guide vane were compared and analyzed. The research results indicate that the change in Reynolds number of the working medium has a significant impact on the hydraulic performance of the axial-flow reactor coolant pump, and the head and efficiency of the coolant pump with lead-bismuth medium are higher than those with water medium. The theoretical head of the coolant pump is basically the same under two different media, but the actual head with LBE medium is 3% higher than that with the water medium, indicating that the difference between the two media is mainly reflected in the flow loss. In the study of the hydraulic loss forms of two media, it was found that the wing loss caused by friction of the coolant pump with LBE medium is smaller than that with water medium, and the boundary layer separation point of LBE medium is significantly delayed. This study can provide some reference for the hydraulic design of the coolant pump of the lead-cooled fast reactor.
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图 4 不同工况下理论扬程及叶轮、导叶水力损失分布
Figure 4. Theoretical Head and Hydraulic Loss Distribution of Impeller and Guide Vane Under Different Operating Conditions
图 6 叶轮壁面Cf分布
A、B—叶轮背面的轮缘前缘位置与轮毂尾缘位置；C、D—铅铋介质下轮毂与轮缘尾缘位置
Figure 6. Distribution of Cf on Impeller Wall
表 1 各计算域网格数量
Table 1. Number of Mesh for Each Calculation Domain
计算域 数量/106 吸入段 0.87 叶轮 14.98 导叶 15.98 支撑段 2.62 出水段 1.51 
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表 2 铅铋介质与水介质物性参数
Table 2. Physical Parameters of LBE Medium and Water Medium
介质 温度/℃ 密度/(kg·m−3) 粘度/(Pa·S) 铅铋 330 10300 0.001625 水 20 1000 0.001
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表 3 数值计算设置
Table 3. Numerical Calculation Settings
名称 设置 介质 铅铋/水 基本假设 不可压缩流体 求解类型 瞬态计算 进口边界条件 总压进口 出口边界条件 质量流量出口 壁面条件 无滑移壁面 交界面形式 瞬态转子-定子模型 时间步长/s 0.000115 收敛精度 10−5
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