Axial Flow Pump Impeller Design And Performance Prediction

Both lifting design method and quasi-three-dimensional design method has been applied to the design of axial flow pump impeller. First the traditional lifting design method was applied to design the axial flow pump impeller on given flow parameters. Then on the assumption of inviscid and incompressible flow, the impeller with thickness was replaced by the superposition of sources on the blade mean surface by quasi-three-dimensional method. According to the flow characteristic, the equations of the mean flow and the mean blade surface equation were set up. The flow equations are solved using finite difference technique. Using body-fitted curvilinear coordinate system treated the boundary conditions. By iteratively solving the flow governing equation and the blade equation, the design of axial flow pump impeller in the quasi-three-dimensional rotational flow can be performed according to the angular momentum distribution, the blade which was designed in the lifting method, flow channel and the blade thickness given. Using modularization theory, computer program including lifting method and quasi-three-dimensional method is designed. Using fluid analyzesoftware, the 3D turbulent flow is stimulated based on Navier-Stokes equations and k-ε model. The turbulent flow through axial flow pump impeller is simulated by using the non-uniform triangle mesh system and the finite volume method. Calculated results are presented at the design operating condition for the impeller in detail, which give a valuable reference to improve the performance of the impeller.