An impeller is a rotating component found in various types of machinery, particularly in pumps, fans, and blowers. Its primary function is to transfer energy to a fluid, which can be either a gas or a liquid, thereby increasing the fluid's velocity and pressure. Impellers are crucial for generating flow and are designed in various shapes and sizes to suit specific applications.Impellers can come in different designs, such as open, closed, or semi-open. The design impacts efficiency, flow rate, and pressure generation.Impellers are often made from various materials, including metals (like stainless steel, aluminum, or cast iron), plastics (like polypropylene or PVC), and composites (like FRP). The choice of material depends on the fluid being handled and the operational conditions.The size and shape of the impeller, including the number of blades, affect the flow rate and pressure generated.