Abstract: In order to improve cavitation performance of SCCP-SFP (the secondary circuit coolant pump of sodium-cooled fast reactor), model pumps A, B and C are constructed respectively by extending the blade inlet edge of the prototype three times on the premise of ensuring that other geometric parameters remain unchanged. Based on the RNG k-ε turbulence model, the Zwart-Gerber-Belamri and Schnerr&Sauer cavitation model, three-dimensional steady numerical simulation for each model pump under single-phase and two-phase cavitation conditions is carried out in this research, and then hydraulic performance curves, cavitation performance curves and internal flow field parameters of each model pump under different working conditions are predicted as well. By comparing the hydraulic performance and internal flow field parameters of the prototype with each model pump, conclusions may be drawn:The blade inlet edge extension has little effect on the hydraulic performance of the sodium pump, and the decline of hydraulic performance of the model pump B is the smallest.The critical cavitation margin for each model pump is reduced in varying degrees, and the cavitation performance of model pump B is the best.By properly extending the inlet edge of the blade, the cavitation performance of the sodium pump is obviously improved.

Key words: SCCP-SFP, hydraulic performance, cavitation performance, inlet edge position of blade