Dynamic Characteristics of Liquid Metal at High Temperature in a Lead-bismuth Reactor Centrifugal Pump
Based on the lead-bismuth stack centrifugal pump,this study investigates the kinetic properties of high-temperature liquid metal media in the pump using numerical methods.The results show that the change of medium properties has little effect on the pump head and efficiency,and the liquid lead bismuth medium(LBE)is slightly higher than normal temperature clear water at full flow conditions,with a difference of 0.32 m in head and 2.09％in efficiency at design flow.The shaft power of liquid LBE medium is about 10.4 times that of normal temperature clear water,and the density ratio of the two mediums is the same.The influence of liquid LBE medium on the flow field is reflected in the suppression of the backflow at the impeller inlet to a certain extent and the reduction of the axial velocity gradient at the impeller outlet,reduced pressure pulsation in the guide vane during high flow conditions.The axial force under liquid LBE medium is about 23.75 times that of normal temperature clear water medium,and the radial combined force is about 10 times that of normal temperature clear water medium,and the change of medium properties has a great influence on the force characteristics of the pump.The research results can provide reference for future design and performance evaluation of centrifugal pumps for lead-bismuth reactors.
lead-bismuth alloycentrifugal pumpvelocity distributionpressure pulsationaxial/radial force
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