屏蔽式核主泵多工况下内部流动特征分析

为深入研究核主泵水力部件的流动特性，基于连续性方程、雷诺时均N-S方程和RNGk-ε湍流模型，针对3种典型运行工况(0.8Q_d、1.0Q_d、1.2Q_d)下缩比系数为0.4的某型屏蔽式反应堆主冷却剂泵模型泵的三维不可压湍流流场进行定常数值模拟，对比分析不同工况下核主泵的压力分布与流场分布，描述叶轮、导叶与压水室的流动特征，并对造成这些特征的原因予以讨论和说明。同时，将数值计算的扬程值和效率值与在闭式试验台所做的试验结果进行对比，绘制出该模型泵在0.8Q_d~1.2Q_d的外特性曲线。结果表明:基于ANSYS CFX的数值分析方法能够有效预测核主泵的水力性能，揭示内部流场的特点，获得内部流动细节；在设计工况下，核主泵的水力性能最佳且流态保持均匀稳定；通过与非设计工况对比，较为全面的掌握了核主泵的流动特性。该研究可为核主泵的水力部件设计与优化提供一定的参考。

Analysis of Internal Flow Characteristics of Canned Nuclear Reactor Coolant Pump Under Multiple Operating Conditions

In order to study the flow characteristics of the nuclear main pump hydraulic components deeply, based on the continuity equation, Reynolds time-averaged N-S equation and RNG k-ε turbulence model, the three-dimensional incompressible turbulent flow of nuclear model main pump with a contracted ratio of 0.4 was simulated under the three typical operating conditions (0.8Q_d, 1.0Q_d, 1.2Q_d). The pressure distribution and flow field distribution of the nuclear model main pump under different operating conditions were compared and analyzed. The flow characteristics of the impeller, guide vane and casing were described and the causes of these characteristics were discussed. At the same time, the numerical calculation of the head and efficiency values were compared with the test results of closed experimental equipment. The model pump's external characteristic curve was plotted at 0.8Q_d~1.2Q_d. The results show that the numerical analysis method, based on ANSYS CFX, can effectively predict the hydraulic performance of the nuclear main pump and obtain the internal flow details. Under the optimum design condition, the hydraulic performance of the nuclear main pump is optimal and the flow state remains uniform and stable. In comparison to the other non-design conditions, the flow characteristics of the nuclear main pump can be mastered in a comprehensive manner, which provides a reference for the design and optimization of the hydraulic components of the nuclear main pump.