Computerized Axial Flow Pump: Fluid Machinery Lab equipment: Tourbo Machinery lab equipment: In an axial-flow pump the pumping medium flows through the impeller (here a propeller) in the axial direction. In axial-flow pumps, the pressure build-up is not achieved by the centrifugal force but like the aerodynamic principle, by the propeller blade. Therefore these pumps are also known as propeller pumps.