In order to investigate the cavitation performance of CAP1400 reactor coolant pump, the standard k-ε model and mixture model was applied to simulate the cavitating flow in a 1∶2.5 CAP1400 model pump. The cavitation inception was reaveled and cavitation development in the impeller and the blade loading characteristics on the middle stream line at different NPSH were analyzed. Furthermore, the cavitation experiment was carried out with sand casting guide vane combined with precision casting aluminum alloy impeller and sand casting impeller respectively. The results we obtained were: the relative position of the volute and impeller has a certain effect on the vapor volume fraction distribution in the impeller and the cavitation is more serious on the suction surface of blade near the outlet of the volute. Blockage effect of cavitation changes the flow angle near the leading edge of blade which causes the cavitation arising on the pressure surface near the leading edge. Blade loading is significantly influenced by cavitation. Blade loading along the streamline has a maximum value near the end of vapor on the suction surface. Uneven distribution of the vapor in the impeller increases the difference of blade loading among different blades. The manufacturing precision of the impeller has a great impact on the cavitation performance of pump.
WANG Wei,WANG Ya-Yun,TANG Tao et al. Numerical simulation and experiment of cavitation performance on CAP1400 nuclear reactor coolant model pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(2): 100-105.