Development of a cylindrical-blade wind turbine driven by a necklace vortex

Abstract

When the blade of a horizontal-axis wind turbine is replaced with a circular cylinder and a ring plate is installed downstream, a necklace vortex forms at their intersection. As the cylinder rotates, this vortex remains stationary on the opposite side of its motion, generating lift and driving the turbine. This is known as a necklace vortex-driven cylinder-blade wind turbine. Developed by the authors, this turbine rotates at less than 1/20th of the peripheral speed of conventional blade-type turbines while generating over ten times the torque. Its low speed eliminates noise and vibration, and the soft-material cylinder blades enhance safety, making it suitable for installation near human living spaces. The turbine consists of a single cylinder as the blade and a ring plate positioned in its wake. Key design parameters include the cylinder diameter and length, the diameter of the ring plate and radial width, and their spacing. This presentation examines how these factors influence power characteristics.