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블레이드 축소모델 풍동시험을 통한 MW급 풍력발전기 성능예측 연구
조태환,김양원,황은수 한국풍력에너지학회 2016 풍력에너지저널 Vol.7 No.1
The aerodynamic performance of the MW size wind turbine was studied by the wind tunnel test with scaled down model. The radius of the real scale blade was about 56 m and the corresponding Reynolds number at the blade tip was 3.6×106. The scaled down model used in wind tunnel test has a 1.1 m radius and the maximum Reynolds number achievable in the wind tunnel test was 0.1×106. The aerodynamic characteristics of the scaled down model by the Reynolds number was studied experimental method and computational method. The Reynolds number effect on the aerodynamic performance of the blade from 0.8×106 to 1.1×106 was tested by changing the rotational speed of the blade from 700 RPM to 900 RPM. The test results show that the power coefficient at 700 RPM was quite low and collapsed by comparison with the results at 800 RPM and 900 RPM. The wake measurement results show that there was a stall in the middle sections of the blade and this made the Cp collapse. The BEMT analysis for the scaled down model and real scale model were conducted and the correlation equation was induced from those results. The aerodynamic performance of the MW size wind turbine blade was estimated from the wind tunnel test results of the scaled down model with this correlation equation.
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사이드펄링을 활용한 과풍속제어장치에 대한 풍동시험 연구
조태환,김양원,장일영,박철완,김정환 한국풍력에너지학회 2017 풍력에너지저널 Vol.8 No.2
A wind tunnel test for the side-furling device that was used for a horizontal type small wind turbine to reducethe output power in a high wind speed condition was conducted in a 5 m × 3.75 m open-jet test section. Asimple experimental wind turbine model with a “MEXICO blade” and electric motor was used to simulate thesmall wind turbine system. The furling force of the tail was measured by a force sensor installed on the furlingarm 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 speedand RPM. Moment equilibrium conditions for the typical wind speed were estimated from those test results andconfirmed by a fixed-tail-angle test. A free-tail-angle test was also conducted to verify the effect of theside-furling device in high wind speed conditions.
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