Journal
ANNALS OF NUCLEAR ENERGY
Volume 180, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.anucene.2022.109467
Keywords
Reactor coolant pump; Non -uniform inflow; Hydraulic loss; Power loss theory; Influence mechanism
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This study analyzes the influence mechanism of non-uniform flow on the performance of a reactor coolant pump (RCP) using experimental and numerical approaches. The results show that non-uniform inflow causes an increase in hydraulic loss within the RCP.
In Advanced Passive (AP) series reactors, the reactor coolant pump (RCP) is directly connected to the bottom of the steam generator (SG) rather than a longer pipe for the fully development of inflow, which leads to the un-steady vortex at pump inlet. Thus, this type of inflow is called non-uniform inflow and might cause extra hy-draulic loss. The method for analyzing hydraulic loss is by evaluating pressure drop, which cannot determine the exact locations of the loss occurred. In this study, experimental and numerical approach is employed to analyze the influence mechanism of non-uniform flow on performance of RCP. The power loss theory is adopted to investigate flow state and location of losses generated under different inflow conditions. The result shows that the non-uniform inflow causes the loss of total head increase inside the RCP. The total loss of head in the impeller and diffuser increased about 17% and 32% respectively. Then, the power loss integrated in hydraulic domain shows that the most important reason for hydraulic loss is the net decrease of mean kinetic energy, especially in non-uniform flow. For the local power loss, the change in distribution caused by kinetic energy also varies significantly. Depending on the loss mechanism inside the pump, it suggests a broad range of promising appli-cations in hydraulic optimization of the RCP.
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