Research On The Influence Of Guide Vane Geometrical Parameters On Performance Of Submersible Pump

The guide vane multi-stage submersible pump has broad application prospects in practical production.The speciality of the working environment has high requirements on the structural design,hydraulic performance and reliability of the submersible pump.Reducing hydraulic loss,improving single-stage head,and improving the efficiency of submersible pump units are a core issue in submersible pump design.The submersible pump has a larger space for improvement in performance than other single-stage single-suction centrifugal pumps.The impeller and guide vane are the most important hydraulic components of the submersible pump,and the performance of the submersible pump is determined by them.This subject takes the 250 QJ five-stage submersible pump as the research object,and focuses on the influence of the geometric parameters of the guide vane on the performance of the submersible pump,and further improves the hydraulic performance of the submersible pump.1.Analysis of external characteristic performance and internal flow field flow characteristics of submersible pumpThe hydraulic performance and internal flow characteristics of different stages of impeller and guide vane of submersible pump are compared and analyzed by numerical calculation results.There are differences in the performance of different stages of the impeller in the five-stage submersible pump.The head and efficiency of the latter four stages is significantly lower than that of the first stage impeller.In addition,the change in the number of stages in the submersible pump has no significant effect on the fluid flow inside the space guide vane.The change of flow condition has a great impact on the flow hydraulic loss on the impeller and the guide vane.Under the deviation of the design condition,the flow state of the fluid inside the pump flow passage is complicated and unstable.2.Research on the influence of the variation of the guide vane geometric parameters on the performance of the submersible pumpThe experimental scheme was designed based on the orthogonal design method,and the test results were analyzed by the range.The results show that the axial length of the guide vane blade has a significant influence on the head and shaft power of the submersible pump,and the inlet width of the vane is sensitive to the change of submersible pump efficiency.The submersible pump performance can be improved when the axial distance between the outlet edge of the guide vane blade and the inlet of the lower impeller is appropriate.Under the rated working conditions,the change of the three factors of the guide vane has a great influence on the impeller performance.The excellent guide vane design makes the fluid flowing into the lower impeller more stable,reduces the impeller loss,and ensures that the impeller efficiency of each stage is maintained at a high level.3.Research on the influence of the relative radial position of the guide vane and the impeller on the performance of the submersible pumpIn order to study the influence of radial position of guide vane on the performance of submersible well pump,nine configurations of guide vane were designed by changing the radial position of guide vane under certain condition of other parameters,aiming at the 250 QJ of submersible pump.Analysing of the calculation results,the performance parameters of the submersible pump are obtained under different guide vane programs.At the same time,the loss of guide vane and the variation rule of cross section area are compared,and the turbulent kinetic energy and static pressure distribution inside the guide vane are compared.The results show that the radial position of the guide vane has a significant influence on the performance of the submersible pump.When the radial distance of the guide vane is increased to an appropriate position,the internal loss of the guide vane is small,and the energy conversion capability is excellent.In addition,the fluctuation of the turbulent kinetic energy inside the guide vane is weakened,and the flow loss is greatly reduced,so as to the improvement of the efficiency of pump.However,the variation rules on the cross section area of guide vanes is obviously different,and the degree of turbulent kinetic energy fluctuation aggravates when the radial distance is exaggerate.Therefore,the flow loss of guide vanes increases and the performance of pump drops.