Analysis And Research The Influence Of Guide Vane And Casing Structure On The Hydraulic Performance In Reactor Coolant Pump

As the only active component in nuclear island primary circuit, nuclear reactor coolant pump (RCP) was called the heart of the nuclear island. Because of the foreign technology monopoly and blockade, RCP has always been the development bottleneck of self-independent nuclear power technology and equipment in China. In order to realize independent innovation, research and develop the RCP with independent intellectual property rights, safety, high efficiency and long service life, the explicit acquaintance of RCP’s flow and structural characteristics is very necessary.Based on the test, this paper unfolded around the CAP1400RCP model pump’s internal steady and unsteady flow with CFD technology’s help. Through in-depth study and analysis of its performance and flow regularity, emphatically discussed the improvement of the model pump flow performance and pressure fluctuation. The conclusion of this paper can provide the CAP1400RCP’s further design and optimization with theoretical and experimental support.In the first place, the CAP1400RCP model pump’s all steady conditions were simulated. All flow rate conditions’performance and flow regularity compared with the test results were analyzed. The results showed that the model pump performance was outstanding and the numerical method was proper. Then in preparation for the follow-up work, unsteady pressure fluctuation’s distribution regularity in time and frequency domain of the model pump under different flow rate conditions was obtained.In the second place, aimed at the CAP1400model pump’s bad flow area, circumferential rotated, cut and uneven guide vane schemes’pump performance were simulated with numerical method, furthermore, the uneven guide vane model’s multi-condition unsteady flow was analyzed, and the results compared with initial model were given. It is shown that to some extent, circumferential rotated, cut and uneven guide vane could improve the flow condition near the outlet of the circular casing, specially, uneven guide vane could change the frequency distribution of the fluctuation, substantially weaken or eliminate the amplitude of the fluctuation which caused by rotorr-stator interaction, this helped to reduce the vibration and noise, improve the safety of the RCP. at last, the influence of the circular casing’s different discharge tube and inflow location, sectional area on the pump performance was numerically analyzed, the results showed that circular casing with center inflow and lateral outflow had better flow performance, circular casing designed by traditional speed coefficient method was easier to make pump’s optimal efficiency shift to the small flow rate.