主管道管径对主泵性能的影响分析

针对压水堆核主泵及其2种不同的主管道冷段管径配置方案,将核主泵与主管道组合建立三维模型,采用六面体结构化网格划分并进行了整个流动区域的非定常流动特性数值计算,得出了不同的主管道冷段配置方案下泵内及管道内的非定常压力脉动特性。分析结果表明:增加冷段管径使主泵本身效率降低,但由于相接的冷段管径增大使水力损失降低,整个系统效率提高了1.3%;配置较大管径冷段可以明显降低过渡段的压力脉动幅值;2种冷段管径方案的泵内导叶入口位置和压水室内的压力脉动幅值差别较小,冷段内压力脉动幅值也较小,且均呈现出无周期和无规律特性;配置较大管径冷段会使轴向力脉动幅值略有降低。

Analysis of Effect of Primary Piping Diameter on Performance of Main Pump

To the nuclear primary pump of PWR and its two different primary piping cold leg diameter configuration schemes, a three-dimensional model is established by combining the primary pump and the primary pipe, and the hexahedron structured mesh is used to perform the model partition and calculate the unsteady flow characteristics of the whole flow region. The unsteady pressure fluctuation characteristics in the pump and the pipe under different cold leg configuration schemes of the primary pipe are obtained. The results show that the primary pump efficiency decreases with the increasing of the cold section diameter, but the hydraulic loss decreases with the increasing of the cold section diameter, and the efficiency of the whole system increases by 1.3%; the pressure fluctuation amplitude of transition section can be significantly reduced with the increasing of the cold section diameter; the difference of pressure fluctuation amplitude between the inlet position of guide vane and the pressure chamber in the two schemes of cold section diameter is small, and the amplitude of the pressure fluctuation in the cold section is also small, and all of them show the characteristics of no cycle and no rule; the configuration of large diameter cold section will slightly reduce the amplitude of the axial force fluctuation.