基于源项法的闭式回路架构对主泵性能影响的分析研究

传统的主泵流动分析平台多为简化的开式流路，与真实闭式回路运行工况存有较大差异。为探究主泵在真实回路中的流动特性与机理，以包含密封口环间隙的主泵全通道水力模型为研究对象，采用源项法进行稳态、瞬态计算分析研究。稳态计算结果表明:闭式循环回路中形成漩涡流态，致使主泵进口处发生预旋，产生入流畸变，导致湍动能有所增加，能量分布不均匀；瞬态计算结果表明:相较于开式流路，闭式回路入流畸变带来流场压力、速度、湍动能、压力脉动等特性的变化，导致泵体扬程、效率均有所下降，所受径向力、轴向力增大。闭式循环回路架构针对主泵流动性能的分析更接近真实流动。 

Analysis and Research on the Influence of Closed Loop Structure on Main Pump Performance Based on Source Term Method

The traditional main pump flow analysis platform is mostly a simplified open flow path, which is quite different from the real closed loop operation conditions. In order to explore the flow characteristics and mechanism of the main pump in the real loop, this paper takes the full-channel hydraulic model of the main pump with seal ring clearance as the research object, and uses the source term method for steady-state and transient calculation and analysis. The steady-state calculation results show that the vortex flow pattern is formed in the closed circulation loop, which leads to pre-swirl at the inlet of the main pump and inflow distortion, resulting in the increase of turbulent kinetic energy and uneven energy distribution. The transient calculation results show that compared with the open flow path, the inflow distortion of the closed loop brings changes in the characteristics of flow field pressure, velocity, turbulent kinetic energy and pressure fluctuation, which leads to the decrease of pump head and efficiency and the increase of radial force and axial force. The analysis of the flow performance of the main pump based on the closed loop structure is closer to the real flow.