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손재훈(Son Jaehoon),백인수(Paek Insu),유능수(Yoo Neungsoo),남윤수(Nam Yoonsu) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.2
The effect of wake on the performance and load of a downstream wind turbine on a floating platform is investigated with a computer simulation in this study. The floating platform consists of a square platform having a dimension of 200 m x 200 m with four 2 MW wind turbines installed. For the simulation, only two wind turbines in series with the wind direction were considered and the floating platform was assumed to be stationary due to its large size. Also, a commercial program based on multi-body dynamics and eddy viscosity wake model was used. It was found from simulation that the power from the downstream wind turbine could be reduced by more than 50% of the power from the upstream wind turbine. However, due to the increase in the turbulence intensity, the power is greater but more fluctuating than the power produced by a wind turbine experiencing the same wind speed without wake. Also, it was found that the load of the down stream wind turbine be comes lower than the load of the upstream wind turbine but higher than the load of a wind turbine experiencing the same wind speed without wake.
김창환(Changhwan Kim),백인수(Insu Paek),유능수(Neungsoo Yoo),남윤수(Yoon Su Nam) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
A load-monitoring system that resembles a small wind turbine is designed to measure the dynamic load of a small wind turbine blade The optical fiber sensors (FBGs) are used in the system to measure the dynamic strain of the blades. The system is designed to perform measurements while the blades are rotating at a specified rotating speed by a motor installed in the Nacelle. It can also be used to test individual pitch control (IPC) algorithms and monitor the conditions of various parts including the main shaft, bearing, tower, and the nacelle in a wind tunnel in the future.
상용 CFD 프로그램을 이용한 풍력터빈 축소모델 출력계수 검증 및 후류 해석
김병수(Kim Byoungsu),백인수(Paek Insu),유능수(Yoo Neungsoo) 한국태양에너지학회 2015 한국태양에너지학회 논문집 Vol.35 No.1
A numerical simulation on the wake flow of a wind turbine which is a scaled version of a multi-megawatt wind turbine has been performed. Two different inlet conditions of averaged wind speed including one below and one above the rated wind speed were used in the simulation. Steady-state pitch angles of the blade associated with the two averaged wind speeds were imposed for the simulation. The steady state analysis based on the Reynolds averaged Navier-Stokes equations with the method of frame motion were used for the simulation to find the torque of the rotor and the wake field behind the wind turbine. The simulation results were compared with the results obtained from the wind tunnel testing. From comparisons, it was found that the simulation results on the turbine power are pretty close to the experimental values. Also, the wake results were relatively close to the experimental results but there existed some discrepancy in the shape of velocity deficit. The reason for the discrepancy is considered due to the steady state solution with the frame motion method used in the simulation. However, the method is considered useful for solutions with much reduced calculation time and reasonably good accuracy compared to the transient analysis.
소형 풍력발전기 날개 모니터링을 위한 FBG 변형률 센서의 적용
김창환(Changhwan Kim),백인수(Insu Paek),유능수(Neungsoo Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Arrays of Fiber Bragg Grating (FBG) sensors and strain gauges were used to extract deflection mode shapes of a small wind turbine blade made from fiber reinforced plastic (FRP). A cantilever system developed for this study was employed to fix the blade at the root. Impact Responses of the blade using the sensors attached from the top and bottom surfaces of the blade were measured. The fundamental frequencies and higher modes of the blade cantilever system obtained from both sensors were almost identical. Deflection mode shapes were estimated from the strain modes. The mode shapes were close but slightly different from each other. The differences are considered due to the fact that the top and bottom sections where the sensors were attached are Non-symmetric.
김창환(Changhwan Kim),백인수(Insu Paek),유능수(Neungsoo Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Dynamic behavior of a small wind turbine blade has been analyzed experimentally. Arrays of Fiber Bragg Grating (FBG) sensors attached along the blade were used to measure strains of the blade surface. Impact test was performed to estimate resonance frequencies of the fundamental and higher modes of the cantilever blade system developed for this study. The results were compared with the results from conventional strain gages. Strains obtained from the FBG sensor array were employed to estimate mode shapes of the blade.
WAsP과 WindSim을 이용한 복잡지형에서의 풍속 예측
우재균(Jaekyoon Woo),백인수(Insu Paek),유능수(Neungsoo Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Comparison of wind speed predictions from WAsP and WindSIM was made. Three sites located in complex terrain were analyzed in this study. Three meteorological masts were installed at the sites and used to measure wind speed and direction for one year. The measured data were used for cross predictions of annual wind speeds for two separate cases including two measurement sites. The WAsP predictions were even more accurate than those from WindSIM for some cases but they were much worse for others. The results from WindSIM showed higher consistency than WAsP and the WindSIM prediction errors were less than 10% for all the cases in this study.
남윤수(Yoonsu Nam),박종식(Jongsik Park),윤태준(Taejun Yoon),유능수(Neungsoo Yoo) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Design of control strategy and structure gives a direct impact on wind turbine's performance and life cycle. A variable rotor speed and variable pitch control strategy is introduced, and a mathematic model of wind turbine dynamics is derived. By using a numeric optimization algorithm, the steady state operating conditions of wind turbines are identified. Because aerodynamic interaction of winds with rotor blades is basically nonlinear, a linearization procedure is applied to analyze wind turbine dynamic variations for whole operating conditions.