Study on Positive Transfer Complete Characteristics of Reactor Coolant Pump under Gas-Liquid Two-Phase Condition

Verified by CFD simulation and gas-liquid two-phase flow experiments,the paper mainly study the hydraulic performance,the volume distributions of gas components inside the flow channel and the flow state on the cooling medium with various void fraction under the complete positive rotation of reactor coolant pump.The research found that with the increasing of the gas voids,the head curves of the reactor coolant pump are shifted downward overall,but the change rule of head curves is largely similar under the working condition of positive rotation with counter flow breaking.Under the working condition of positive rotation and with positive flow breaking,gas voids gradually reduce the influence on the lift characteristics of reactor coolant pump with the increasing of the flow rate.Moreover,the torque of reactor coolant pump is obviously proportional to the density of coolant medium under the same flow rate.