Abstract:In order to analyze the structure of lowpower consumption auxiliaryimpeller and apply it to selfpriming pumps,the main factors affecting power consumption and sealing pressure ability were analyzed by using CFD numerical simulation.A variety of numerical models were established based on blade type,number of blades,antirotation guide vanes,radial clearance and balance outlet locations.The k-ε turbulence model was adopted for steady flow simulation in predicting hydraulic performance.The obtained results showed that 4.9% more sealing pressure could be achieved when afterwardbent blades were used and the number of blades was increased.However,40% more power consumption was generated during the same process and therefore the sealing pressure power ratio was decreased.The antirotating vanes can eliminate the liquid rotation and improve the sealing ability 5.7% higher.The change of vanes′ width has little effect on further enhancing the ability of sealing pressure.With the decrease of the radial clearance between impeller and wall,sealing ability performs much better.The presence of balance outlet can improve the sealing effect 3.5% better.However,the location of balance outlet has a greater impact on the ability of sealing pressure.In the same time,twostage auxiliaryimpeller was put forward and was analyzed about power consumption and sealing ability.Analysis and engineering application results showed that the multistage auxiliary impeller with afterwardbent blades and fixed blades has a better sealing performance and the power consumption could be reduced to 55% of a singlestage structure.
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