Mechanical Engineering - Hydraulic Machines - Discussion

The efficiency of a centrifugal pump is typically maximum when the blades are designed to a specific angle, which is often determined by the pump's intended application and design parameters. While backward-curved blades are commonly used in some types of centrifugal pumps, such as those designed for high-pressure and low-flow applications, the efficiency of the pump is influenced by various factors including blade shape, pump design, fluid properties, operating conditions, and more. Therefore, it's not accurate to state that the efficiency will always be maximum when the blades are bent backward.