Optimal Design Of Submersible Axial Flow Pump Based On Six Sigma Theory

In recent years,many cities in China have been building flood control and drainage pump stations,especially in the southern region,where the demand for large axial flow submersible pump is particularly large,and the consumption of electric power of axial flow submersible pump is huge.In recent years,China has been emphasizing environmental governance,energy conservation and emission reduction,and the country has also issued standards on the energy efficiency limit value and energy conservation evaluation value of submersible sewage pump.In view of the increasing consumption of axial-flow submersible pump and the increasing national requirements for energy efficiency,it is imperative to improve the efficiency of axial-flow submersible pump.The purpose of this paper is to improve its hydraulic efficiency by studying the hydraulic model of axial-flow pump impeller,so as to achieve the goal of national energy conservation and emission reduction.Learned the research method of this paper is combined with the work of six sigma management theory knowledge,and a complete set of combination of theory and the optimization design of submersible axial flow pump,the hydraulic model of optimization design stage using the response surface design of experiment,fitting regression analysis,the optimal design method,and use Minitab software to optimize analysis,can help to find the optimal hydraulic model parameter is set.In terms of performance analysis,CFD In recent two years,many cities in China are building flood control and drainage pump stations,especially in the south,the demand for large-scale submersible axial flow pump is particularly large,and the power consumption of the submersible axial flow pump is huge.In recent years,China has been emphasizing on environmental governance and energy conservation and emission reduction,and the state has also issued standards on the limited value of energy efficiency and evaluation value of energy conservation of sewage sewage submersible pump.In view of the increasing consumption of submersible axial flow pump and the increasingly high requirements of the state for energy efficiency,it is imperative to improve the efficiency of submersible axial flow pump.The purpose of this paper is to study the impeller water of axial flow pump.Force model,improve its hydraulic efficiency,so as to achieve the goal of national energy conservation and emission reduction.The research method of this paper is to combine the relevant methods of "Six Sigma Theory" and the theory with the optimization design of the submersible axial flow pump.In the optimization design stage of the hydraulic model,the response surface test design,fitting regression analysis,Wang Da optimization design and other methods are used,and the optimization analysis of CFD simulation results is carried out by using Minitab analysis software,so as to find out the best way.Parameter setting of optimal hydraulic model.In the aspect of performance analysis,the head and efficiency of each impeller scheme are simulated by CFD technology,and the relationship between efficiency and inlet angle and cascade density is found by Minitab software according to the simulation results.In the design of axial-flow pump blades,the latest streamline method is adopted,and the hydraulic design is carried out according to the method of linear correction of circulation distribution law from rim to hub.The main research contents and creative achievements of this paper are as follows:1.Based on the six sigma theory and method,the flow chart of impeller design is used to determine the key factors affecting the efficiency of the axial flow pump and the goal of efficiency improvement.2.The response surface design method was adopted to conduct cross combination analysis of the cascade density and inlet impulse Angle,to find out the value reaching the highest efficiency.The fitting regression analysis was carried out through Minitab software and the optimization of "large target" was carried out.The conclusion was that the hydraulic efficiency of the impeller could be improved by taking a large value of the cascade density and a small value of the inlet impulse Angle.3.According to the conclusion obtained from the experimental design,an optimized hydraulic model was redesigned to verify the conclusion.The hydraulic efficiency of the optimized model was analyzed by CFD,and the hydraulic efficiency value obtained was 93.59%,the highest among all schemes,which proved that the conclusion was correct and effective.4.Conclusions according to the experiment design to design an optimized hydraulic model,to validate the conclusion that using CFD analysis of the hydraulic efficiency of the optimization model,the hydraulic efficiency value is 93.59%,is the highest in all solution,prove the conclusion is correct and effective design of the pump structure,and the bell mouth water,impeller and guide blade and extend the period of overall analysis of imports and exports,for steady and unsteady analysis respectively,the conclusion is: under the rated flow,lift and efficiency to meet the design requirements;The flow state in the impeller runner is smooth.The pressure pulsation at impeller inlet and outlet presents good periodicity.The pressure pulsation frequency is consistent with the passage frequency of the impeller blade.Based on the above conclusions,the design meets the requirements and can be used in production and processing.5.After the performance test of the prototype,the efficiency value of the optimized 350zq-125 submersible axial flow pump reached 69.7% near the rated point,which was 6.6 percentage points higher than the original pump and reached the expected goal.The flow rate and head are slightly higher than the expected target,and the study of this model is successful.