풍력터빈 블레이드 주위 흐름의 유동특성에 대한 실험적 분석 = Experimental Analysis of Flow Characteristics around Wind-Turbine Blades

다국어 초록 (Multilingual Abstract)

The flow and noise characteristics of wake behind wind-turbine blades have been investigated
experimentally using a two-frame particle image velocimetry (PIV) technique. Experiments were carried
out in a POSTECH subsonic large wind-tunnel (1.8W×1.5H×4.3L㎥) with KBP-750D (3-blade type) windturbine
model at a freestream velocity of Uo= 15 m/s and a tip speed ratio λ = 6.14 (2933 rpm). The windturbine
blades are connected to an AC servo motor, brake, encoder and torque meter to control the rotational
speed and to extract a synchronization signal for PIV measurements. The wake flow was measured
at four azimuth angles (φ = 0˚, 30˚, 60˚ and 90˚) of the wind-turbine blade. The dominant flow structure
of the wake is large-scale tip vortices. The turbulent statistics such as turbulent intensity are weakened
as the flow goes downstream due to turbulent dissipation. The dominant peak frequency of the noise signal
is identical to the rotation frequency of blades. The noise seems to be mainly induced by the tip vortices.

참고문헌 (Reference)

1 Vermeer, L. J., "Wind Turbine Wake Aerodynamics" 39 (39): 467-510, 2003

2 Lee, S. J., "PIV/PTV Velocity Field Measurement Techniques-Theory and Practice"

3 Bjorkman, M., "Long Time Measurement of Noise from Wind Turbines" 277 (277): 567-572, 2004

4 조윤모, "Dual-Rotor 풍력 발전 시스템 성능 해석 및 피치 제어에 관한 연구" 한국항공우주학회 33 (33): 40-50, 2005

5 이연원, "CFD에 의한 수평축 풍력터빈의 공력해석에 관한 연구" 한국풍공학회 9 (9): 103-108, 2005

6 Adrian, R. J., "Analysis and Interpretation of Instantaneous Turbulent Velocity Fields" 29 : 275-290, 2000

7 Vermeer, L. J., "A Review of Wind Turbine Wake Research at TUDelft"

8 Fujii, S., "A Note on Tower Wake/Blade Interaction Noise of a Wind Turbine" 97 (97): 333-336, 1984