수직축 풍력터빈을 위한 풍력타워에서의 속도증가에 대한 실험적 연구

Abstract

An experimental study was conducted to augment the performance of VAWTs (vertical axis wind turbine). To enhancethe wind velocity, a wind power tower was applied. The velocities within the wind power tower was measured in a wind tunnel with atest section is 2 m in height and 2.2 m in width. The experiment was conducted with two different velocities according to Reynoldsnumber, 2.1x105 and 1.7x105, based on the length of the guide wall. The measured velocities within the wind power tower werecompared with those measured without a wind power tower. The wind power tower was rotated so that the effect of the wind directionwas considered. Therefore, the velocities within the wind power tower were measured for various azimuth angles. The pressures weremeasured at the upstream and downstream of the wind power tower. The total pressure loss occurred by installing of the wind powertower was estimated. The inner and outer radii of the guide wall were varied to measure the effect depending on the size of the windpower tower. The measured velocity within the wind power tower showed the periodical variation along the azimuth direction. Basedon the near center location where the variation of the velocity was insignificant, the experimental results showed that the wind velocitywas augmented more than 15% by the wind power tower.