Aerodynamics of the wells turbine

Abstract The paper describes a theoretical and experimental investigation concerning the aerodynamic performance of the Wells turbine, a self-rectifying axial-flow turbine suitable for energy extraction from reciprocating air flow. The turbine consists essentially of a rotor with untwisted aerofoil blades of symmetrical cross section, set radially at 90° angle of stagger. Numerical results were computed from a streamline curvature throughflow method and compared with analytically obtained results from a linear actuator disk model. Unidirectional steady-flow measurements were performed with a turbine of about 0.6 m rotor diameter and several numbers of blades, and included flow rate, pressure drop and torque, as well as velocity and pressure distributions. Experimental results are compared with theoretical values.