Optimization Design of Inlet and Outlet Clearance between Stator and Rotor of Full-Crossflow Pump Unit
In order to optimize the hydraulic characteristics of clearance flow between stator and rotor of full-crossflow pump unit,the influence mechanism of the alteration of inlet and outlet width parameters of the clearance between stator and rotor on the performance of the pump unit through numerical simulation is analyzed in this paper.Aiming at the overall operating efficiency of the unit,the inlet and outlet width parameters are optimized,which is verified by model experiment.The results show that the design of inlet and outlet structure of clearance between stator and rotor can affect the overall performance of full-crossflow pump by influencing the hydraulic characteristics of the clearance flow between stator and rotor.When the width of the clearance of the outlet section between stator and rotor exceeds 5 times the middle width of the clearance,the vortex influence area on the outlet side of the clearance increases significantly,generating wall attached vortices and greatly affecting the flow state in the mainstream region.By optimizing the inlet and outlet width parameters of the clearance,the operating efficiency of the full-crossflow pump unit can increase by 8.79％at most,and the effect is relatively significant when the unit is running in the high efficiency zone.The optimal design width of both inlet and outlet of the clearance between stator and rotor are 3.12 times of the middle width of the clearance.In this case,the operating performance and internal flow field of the unit can improve by about 7％compared with the conventional pump,and the operating efficiency of the unit can reach 73.21％.
Full-crossflow pump unitClearance between stator and rotorStructural optimizationNumerical simulationModel experiment
万方数据
维普
