Design and analysis of 2D blade profile on a centrifuge impeller

A new method of 2D blade profile design on a centrifugal impeller was proposed to improve the aerodynamic performance of the impeller. The blade profile was designed through full three-dimensional numerical simulation by giving channel average relative velocity distribution along the radius, without changing the profiles of its hub and shroud. The computational results of isolated impeller show that the performance of the new impeller obviously increases in most conditions. Efficiency and pressure rise increase by 12% and 8.9%, respectively, at design point. At the same time, the low-velocity zones are both greatly reduced and the static pressure is uniformly distributed, too. The computational results for the whole fan with the original volute show that the efficiency increases by more than 10% at design point, and the backflow in the outlet section of the volute is eliminated. However, the pressure rise amount decreases in high flow conditions.