Experimental and numerical investigation of the leading edge sweep angle effect on the performance of a delta blades hydrokinetic turbine

Abstract

In the last decades, an increase of energy consumption has been noted around the world. Hence, the excessive use of fossil fuels can lead to serious environmental concerns. Indeed, the use of renewable energy sources is needed to reduce the greenhouse gas effects and the CO 2 emissions in the atmosphere. Small-scale hydropower could be an interesting and renewable alternative solution. The cross-flow turbines present several advantages compared to the axial-flow turbines. Therefore, increasing efforts are taken to enhance the efficiency and extend the applicability of the cross-flow turbines. In this paper, experimental investigation was carried out to evaluate the performance of a delta blades turbine with leading edge sweep angle equal to γ = 30°. The experimental investigation was conducted in an irrigation channel characterized by a water current of constant velocity equal to V ∞ = 0.86 m s −1 . In addition, numerical study was carried out to analyze the effect of the leading edge sweep angle on the performance of the delta blades turbine and the hydrodynamic characteristics of the flow around the turbine. Numerical findings confirm that the leading edge sweep angle has an impact on turbine efficiency and the hydrodynamic characteristics of the flow around the turbine. • A numerical-experimental study has been carried out on a hydrokinetic turbine with delta blades. • The maximum power coefficient value is given for a TSR of 0.7. • The effect of different leading edge sweep angle on the turbine performance is studied. • The leading edge sweep angle affects the hydrodynamic characteristics of the flow. • The optimal leading edge sweep angle is suggested finally.