Wastewater pumps are generally designed to have wider flow passage, for example by reducing the number of impeller vanes, in order to increase the solid handling capability. However, once the flow passage of an impeller has been widened, secondary flow (turbulent flow) such as reverse flow or eddy current may be produced in addition to the smooth flow that moves along the vane, which could cause drop of the pump efficiency.
By utilizing the CFD (Computational Fluid Dynamics), Tsurumi designs the impellers having optimum flow passages that control the secondary flow and aims at to improve the two conflicting characteristics, which are pump efficiency and the solid handling capability.
