The aerodynamic characteristics and surface structure of the cylinder wings of the magnus windmill (effect of vertical groove and the horizontal groove given to the cylinder surface)

Abstract

Cylindrical wings with longitudinal grooves, streamwise grooves and spiral fins are used to clarify the performance of the magnus windmill. Windmill number of revolutions was measured using a wind tunnel at wind speed of 4~20 m/s and a cylinder rotation at 400~1600 rpm. As a result, it was revealed that a spiral fin has a windmill rotation with the lowest wind velocity and a longitudinal groove cylinder has a highest rotation number of windmill.