Performance Enhancement of Flapping Turbine in Reversed D Mode: Effect of No-Circular Trajectory

Reversed D turbine is considered as an improved version of flapping vertical turbine. Its trajectory is a combination between a circular path and the typical vertical path. In this investigation, the circular path is modified by different non-circular trajectories in an attempt to increase the energy extraction of the turbine. A 2D computational analysis is executed using ANSYS Fluent.22. The motion of the airfoil is achieved by using a combined deformable mesh where both layering and sliding techniques were used. The effect of different non-circular trajectories was investigated to change the vortex shedding pattern. Results revealed that the elliptical curve is the most suitable path due to its ability to balance between the energy resulting from the vertical movement and the energy consumed by the horizontal movement.