Based on threedimensional inverse design theory, the meridional gradient of circulation vur was adopted as control parameter of blade loading distributions. Two parabolic curves were proposed to describe blade loading distributions along meridional streamlines. In order to analyze influences of blade loading distributions on design of mixedflow pump impellers, three impellers respectively with foreloaded, midloaded and aftloaded blade loading distributions were designed. Based on the RANS equations, SST turbulence model and multiplereferenceframe model, flow fields of the impellers were simulated and the impeller performances and blade surface pressure distributions were analyzed. The results show that it′s practicable to apply two parabolic curves to describe blade loading distributions. Threedimensional inverse design theory with adjustable blade loading distributions can effectively control pressure distributions on blade surfaces. As the location of blade loading peak approaches leading edges, impellers performances of head, power and efficiency all increase. At the design flow rate, differences of head, power and efficiency between foreloaded impellers and aftloaded impellers are 18.3%, 16.4% and 2.01% respectively. With different loading distributions, differences of three impeller performances are gradually obvious as flow rate increases.
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