| Liquid metal is used as a coolant in sodium-cooled fast reactors to effectively remove the heat generated in the core.Electromagnetic pumps are employed to drive the flow of liquid metal,which offers advantages such as no rotating parts,good sealing,simple structure,and reliable operation.Therefore,the development of electromagnetic pumps for metal-cooled fast reactors is of great significance for the advancement of fast reactor technology and equipment.Due to the structural characteristics of electromagnetic pumps and the high temperature of the liquid metal medium,it is extremely difficult to directly obtain the physical field distribution inside the pump through experiments.Therefore,this paper adopts a numerical simulation method to obtain the multi-physical field distribution of the thermal-hydraulic prototype of the electromagnetic pump,and conducts a coupled analysis of the temperature field,flow field,and electromagnetic field.The main research content and achievements are as follows:(1)Based on the Maxwell module and Fluent module in the ANSYS platform,the thermal generation and Lorentz force generated by the electromagnetic pump are added to Fluent as a source term through UDF secondary development,and a transient coupled model of the multi-physical field of the ALIP electromagnetic pump is established.The simulation model was reasonably simplified without affecting the accuracy of the analysis results.The loading current was set to 44 A,the frequency was 50 Hz,and the pump groove width was 6cm for the analysis.The comparison of simulation results and experimental results shows that the error of the temperature field is less than 1%,and the error of the inlet and outlet pressure difference under different flow rates is less than 5%.The simulation data has a high consistency with the experimental data.(2)By analyzing the model under various working conditions,it is found that the absolute error of the simulation results compared with the experimental data is less than 20%,which verifies the applicability of the model under different working conditions.Moreover,the influence of factors such as the type of metal flowing in the electromagnetic pump and the frequency of the loading current on the operation of the electromagnetic pump was studied.The results show that:(1)The larger the electrical conductivity of the metal working fluid flowing inside the electromagnetic pump,the smoother the change of the inlet and outlet pressure difference with the inlet flow rate;(2)Selecting a suitable loading current frequency can improve the efficiency of the electromagnetic pump drive due to the skin effect;(3)Under the same working conditions,the inlet and outlet pressure difference increases with the increase of the current. |
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