Study on blades shape of horizontal axis type wind turbine driven by longitudinal vortex

Abstract

The purpose of this research is to improve performance efficiency by changing the blade shape of a horizontal axis type wind turbine driven by longitudinal vortex．It is a wind turbine driven by using longitudinal vortex generated around the vicinity of blades．The driving principle is different from conventional wind turbine，and it has the characteristics of low rotation and high torque．Regarding this research，research on cylindrical wings is underway， but cylindrical wing is in a shape that tends to be subject to resistance in the direction of rotation，and sufficient driving force cannot be obtained．Therefore，we will examine the shape of the wing that can maintain the characteristics of longitudinal vortex and reduce resistance．For this purpose，wind tunnel experiments were conducted using the actual wind turbine．The power coefficient and torque coefficient were determined and evaluated．Also，to clarify the effects of longitudinal vortex and the phenomena around the new wing，the analysis was performed using the numerical fluid analysis software STAR-CCM +．Finally，We can clarified that the shape of the wing can generate a longitudinal vortex while receiving drag from the mainstream．