Optimization Of The Impeller Blade Profile Of CZ Series Horizontal Centrifugal Pump

Pump is a kind of fluid machinery which is closely related to the production and life of human beings.The use of the pump is very large,it is the most widely used after the motor of general machinery.Pump is divided into many types,in which the largest proportion of the centrifugal pump.At present,there is a big gap between the efficiency of the centrifugal pump product developed and manufactured by our country compared with foreign countries,the improvement of the efficiency of centrifugal pump has great potential in our country.The improvement of the efficiency of the centrifugal pump has great significance to the strategy of energy conservation and emission reduction in china.Centrifugal pump is a vane type pump,the core component of the centrifugal pump is the impeller,the performance of the centrifugal pump depends on the impeller.Therefore,to improve the efficiency of the centrifugal pump,it is needed to design the impeller with excellent hydraulic performance.The purpose of this paper is to optimize the impeller blade profile of CZ series horizontal centrifugal pump.Because the CZ series of horizontal centrifugal pump series impeller blade type line is similar,so select the representative of the CZ50-315 type centrifugal pump as the research object.The results of the study can also be applied to other types of pumps in this series.According to the rated condition parameters of the CZ50-315 type centrifugal pump,the parametric design of the impeller of the centrifugal pump is carried out.Then,according to the calculated parameters,the 3D modeling of the parts such as the impeller and the pump body of the centrifugal pump is generated by the Solid Works,and a 3D model of the assembly of the centrifugal pump is formed.The flow field simulation of the three-dimensional model of the centrifugal pump assembly is carried out by using the flow field simulation plug-in Flow Simulation in Solid Works,the flow field simulation pressure distribution section,velocity profile and simulation parameters are obtained.By observing the flow pressure and velocity distribution diagram,and analyzing the simulation parameters,it is found that the flow of the fluid in the impeller blade is separated by the boundary layer,which leads to the phenomenon of vortex and backflow.Therefore,this paper uses the theory of boundary layer separation as the optimization method,without changing the main parameters of the impeller diameter,according to the obtained parameters of the impeller design calculation of boundary layer separation blade type line velocity coefficient,calculated for the specific expression of the boundary layer without separation of the blade type line parameter equation.Based on the expression of the non separated line,the optimized blade cutting pattern is drawn,according to the main parameters of the impeller,the 3D modeling and flow field simulation of the optimized impeller are carried out according to the previous steps.The flow field simulation results of the optimized centrifugal pump are compared with the simulation results of the flow field of the prototype pump.After optimized impeller internal flow field in centrifugal pump without vortex,reflux phenomenon,reduce the energy loss,under the same condition,the efficiency has been significantly improved,reflects the effect of optimization.