사이드펄링을 활용한 과풍속제어장치에 대한 풍동시험 연구

Experimental Study on Aerodynamic Characteristics for Side-Furling Control System

A wind tunnel test for the side-furling device that was used for a horizontal type small wind turbine to reduce the output power in a high wind speed condition was conducted in a 5 m × 3.75 m open-jet test section. A simple experimental wind turbine model with a "MEXICO blade" and electric motor was used to simulate the small wind turbine system. The furling force of the tail was measured by a force sensor installed on the furling arm and the yawing moment of the turbine was measured by a moment sensor installed on the turbine strut. The turbine power was calculated by using the torque of the rotating axis and the rotational speed of the blade. Force characteristics of the tail system were studied by changing the arm length, wind speed and flow direction. Moment characteristics of the nacelle and blade system were studied by changing the offset distance, wind speed and RPM. Moment equilibrium conditions for the typical wind speed were estimated from those test results and confirmed by a fixed-tail-angle test. A free-tail-angle test was also conducted to verify the effect of the side-furling device in high wind speed conditions.