Research On Hydraulic Design And Numerical Simulation Of Two-dimensional Centrifugal Pump Impeller

The design of centrifugal pumps includes hydraulic design and structural design,and thehydraulic design is the important process of centrifugal pumps transformed fromparameters into the real machine.On the basis of the assuming rationalization of theinternal flow,the one-dimensional, two-dimensional and three-dimensional hydraulicdesign theories had been deduced.Currently，the majority believe the two-dimensionaltheory is suitable to design high-specific speed mixed-flow pumps,and the studies ofmedium-low-specific speed centrifugal pumps designed with the theory is few.In the thesis,the calculation methods of impeller design has been deduced from theone-dimensional and two-dimensional theories,which based on the rotational-flow theoryand the potential-flow theory in Hydromechanics.Seting a series of electro-hydrauliccentrifugal pumps as the models, two low-specific speed centrifugal pumps(Q7H50) andtwo medium-specific speed centrifugal pumps(Q25H52) had been designed according tothe one-dimensional theory and the two-dimensional theory.Verified the feasibility ofmedium-low-specific speed centrifugal pump design methods of the two-dimensionaltheory.Using the CFD software FLUENT to simulate the internal flow of themodels,obtained the flow distribution characteristics and performance parameters withthe contrastion between the one-dimensional theory and the two-dimensional theory.Andproposed the improving measures.