核主泵环形压水室内的能量转换特性

为揭示环形压水室内部流动及能量转换规律，提高核主泵的整体水力性能，基于Reynolds时均化N-S方程和RNGk-ε湍流模型，对核主泵缩比模型内部流动进行全三维数值计算，对比分析不同工况下压水室内部流动特征、能量损失以及不同截面动静压能变化规律。结果表明:环形压水室内水力损失随着流量的增加近似呈线性增加，对于压水室损失占总损失的比重，在小流量及设计工况下，呈非线性成倍增加趋势，当流量增大至1.2Q_d时，压水室损失比重变化平缓；在压水室环形流道内静压能比重明显高于动压能，且静压能比重沿流向近似线性减小，动压能比重沿流向线性增大；在不同工况下环形压水室内部流动呈现明显的非轴对称性，由于回流存在导致隔舌附近区域流动复杂，且偏设计工况下回流量要明显大于设计工况下回流量。

Energy Conversion Characteristics of Annular Pumping Chamber in Reactor Coolant Pump

In order to reveal the rules of internal flow and energy conversion in annular pumping chamber and improve the overall hydraulic performance of reactor coolant pump, a three-dimensional numerical investigation was carried out in model pump based on Reynolds-averaged N-S equations and RNGk-ε turbulent model. The flow state, energy loss and the changes of dynamic and static pressure energy in different sections were compared and analyzed under different conditions. The results show that the hydraulic loss of the annular pumping chamber increases approximately in a line with the increase of the flow rate. For pumping chamber loss accounted for the proportion of total losses, under small flow rate and the design conditions, the increasing trend is nonlinear.When flow rate increases to 1.2Q_d, pumping chamber loss proportion changes gently. The proportion of the static pressure energy in the annular flow passage of pumping chamber is significantly higher than that of the dynamic pressure energy, and the proportion of the static pressure energy almost linearly decreases along the flow direction, and that of the dynamic pressure energy changes by contraries. The internal flow of annular pumping chamber under different conditions show significant non-axial symmetry, and the flow complexity in the area adjacent to the tongue is mainly caused by backflow and the backflow rate under off-design conditions significantly greater than that under the design condition.