| With the development of nuclear energy,the secondary circuit coolant pump of sodium-cooled fast reactor is the core eQuipment of the fourth generation nuclear that is the most advanced power system in the world,It is very important to improve efficiency under the condition of ensuring its safe operation.The secondary circuit Coolant Prototype Pump of Sodium-Cooled Fast Reactor is chosen as the study object.It was optimized by changing the number of impeller blades and the number of vanes and the parameters of the hemispherical pressure chamber.First of all,this paper focuses on the effect of the number of blades and the number of guide vanes on the performance of the sodium pump in the fast-reactor secondary circuit sodium pump impeller.Many Model pumps with different matching laws between the impeller blade number Z1 and the guide vane blade number Z2 are built based on the references and geometry parameters of the Model pump.Then their hydraulic performances are predicted by numerical simulation,and the results are as follows.The maximum change in the head of the sodium pump is 4.34%Hd,and the maximum change in efficiency is 2.02%when the number of impeller blades is constant.At the designed condition,best blade number matching laws between impeller and guide vane are?Z1=5,Z2=8???Z1=6,Z2=9?and?Z1=7,Z2=11?,The performance of the pump is best when the guide vane blade number is about 1.5 times of the impeller blade number.Secondly,this article focuses on the effect of the hemispherical pressure chamber diameter on the performance of the sodium pump.Predicting performance of sodium pump under different D5 scenarios through numerical simulation,Based on the optimal impeller and guide vane number matching scheme and ensure that the remaining geometric parameters of the sodium pump remain unchanged.The result got from study above are as follows:As the hemispherical pressure chamber diameter D5 increases,the head of the sodium pump also increases under design conditions.The head of the sodium pump remains basically the same when D5 is increased to 1000mm.The change trend of sodium pump efficiency is consistent with the change of the sodium pump head.The total loss of the sodium pump guide vane,hemispherical pressure chamber,and extrusion end decreases with the increase of the diameter D5 of the hemispherical pressure chamber.The total loss is basically unchanged after the hemispherical pressure chamber diameter D5 is large than 1000mm.Finally,the influence of the angle change?between the center line of the extrusion end and the rotation axis of the impeller on the performance of the sodium pump is studied.Predicting the Performance of Sodium Pump under different?by Numerical Simulation.The result got from study above are as follows:Under the design conditions,the head and efficiency of the sodium pump increase gradually with increasing?,and the increasing trend gradually decreases.When?=70°,the model pump has the best head and efficiency performance;The maximum differential pressure of the outlet of pressure chamber is minimum.Under the condition of 1.2Qd,with the change of?,the change law of performance and internal flow field is basically consistent with design conditions. |
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