标题：Experimental analysis of the influence of the twist angle of the blades of hydrokinetic Darrieus helical turbinesAnálisis experimental de la influencia del ángulo de torsión de los álabes de turbinas hidrocinéticas Darrieus helicoidales
摘要：Hydrokinetic turbines are presented as a future alternative for obtaining energy from water currents in a sustainable way. The increase in the efficiency of these turbines from different approaches constitutes a line of research in which numerous efforts are being concentrated. An experimental study is presented where the influence of the twist angle of the blades in the operation of the hydrokinetic turbines of the helical Darrieus type is analysed. The study is carried out in the water tunnel installed at the Polytechnic School of Mieres (EPM, University of Oviedo) equipped with the necessary instrumentation to obtain the characteristics of the evolution of the power produced with the rotational speed for different flow velocities and current blockages. Three models of turbine rotors were characterized with different twist angles (30º, 45º and 60º), under low current velocity and constant blockage conditions being able to know the conditions of maximum energy production, with clear differences between the cases. The results were also compared with the maximum power that can be recovered from a water current, defined by the actuator disc model for a uniform flow in channels, obtaining maximum efficiency values for the case of 45º twist angle.
