수직축 풍력터빈의 후류 특성에 관한 실험적 연구

Experimental study on the wake characteristics of vertical axis wind turbine

A study of far wake characteristic of vertical wind turbines is necessary in order to sit them on a wind farm array. Most research has been conducted on flow measurements of near-wake in a vertical wind turbine, but very limited studies are found in far wake model. This study presents quantitative results of wind tunnel tests for far wake field of a Darrieus vertical axis wind turbine. Hot-wire anemometry was used to measure the distribution of mean velocity deficits and turbulence intensities, positioning it behind in distances between 2 and 12 times the diameter of the rotor. In comparison with horizontal axis wind turbine, velocity deficit and wake width of vertical axis wind turbines showed similar trend, and they set apart in two notable characteristics: drift of the lower peak velocity location and acceleration of wind velocity near the rotor.