The wind power has been used for the energy source but its importance has been inferior to the fossil energy with abundant and convenient characteristics. However, the energy crisis have faced and the environmental problems have recently raised. In this situation, the interest in wind power has been...
The wind power has been used for the energy source but its importance has been inferior to the fossil energy with abundant and convenient characteristics. However, the energy crisis have faced and the environmental problems have recently raised. In this situation, the interest in wind power has been risen as an important energy source. Many countries have tried to apply their experiences, theoretical studies, new technologies and investments to the technological development of the wind energy. Recently, the trend of the wind turbine system development has become much larger scale over several MW class. However, because the small-scale wind turbine system has some advantages, which someone can build personally it with low cost as well as experience energy save effect, it has been continuously developed. Currently, because most commercialized small scale wind turbine systems have been designed with the rated wind speed more than 12 m/s, they show great reduction of aerodynamic efficiency at the low wind speed region like Korea. This study proposes a development for the 1 kW class small wind turbine system, which is applicable to relatively low wind speed region and has the variable pitch control mechanism.
In the aerodynamic design of the wind turbine blade, parametric studies were carried out to determine an optimum aerodynamic configuration which is not only more efficient at low wind speed but whose diameter is not much larger than similar class other blades. The rated wind speed was determined as low as possible for low wind speed region. The FFA-W3-211 airfoil was used considering the characteristics such as Reynolds number, maximum lift coefficients, stall angle of attack, maximum lift-drag ratio, maximum thickness and so on. The basic profile was designated by the Strip Theory used for both of the Momentum Theory and the Blade Element Theory. From this design, there were determined the distribution of the chord length and the twist angle. To perform the aerodynamic analysis, the computational analysis method was applied. But in the operational range of the rotational blade, the local stall of the rotational blade was a difficult part for adaptation of these theories. Therefore, to cover the defect, the aerodynamic test was performed for the prototype blades.
In the structural design the structural configuration was designed for the Skin-Spar-Foam sandwich structure and it was determined to be light weight as the gradually reduction of the blade spar thickness form root to tip. The connecting area of the hub was adapted to the flange method. The material was used for the glass/epoxy certificated its properties under the domestic production. In its manufacturing there was utilized the wet lay-up and matched die molding. In the structural analysis there were utilized the FEM(Finite Element Method) and analyzed the stress and the strain. Also, there were considered the local buckling by the bending load. The rotating blade was verified from the natural frequency by the eigenvalue analysis. There was testified the satisfaction of 10years, the fatigue life by the S-N linear damage method. Moreover both structural safety and stability were verified through the full-scale structural test. Finally the pitch control mechanism using three masses and three springs was designed for easy start and prevent over speed.
The wind power has been used for the energy source but its importance has been inferior to the fossil energy with abundant and convenient characteristics. However, the energy crisis have faced and the environmental problems have recently raised. In this situation, the interest in wind power has been risen as an important energy source. Many countries have tried to apply their experiences, theoretical studies, new technologies and investments to the technological development of the wind energy. Recently, the trend of the wind turbine system development has become much larger scale over several MW class. However, because the small-scale wind turbine system has some advantages, which someone can build personally it with low cost as well as experience energy save effect, it has been continuously developed. Currently, because most commercialized small scale wind turbine systems have been designed with the rated wind speed more than 12 m/s, they show great reduction of aerodynamic efficiency at the low wind speed region like Korea. This study proposes a development for the 1 kW class small wind turbine system, which is applicable to relatively low wind speed region and has the variable pitch control mechanism.
In the aerodynamic design of the wind turbine blade, parametric studies were carried out to determine an optimum aerodynamic configuration which is not only more efficient at low wind speed but whose diameter is not much larger than similar class other blades. The rated wind speed was determined as low as possible for low wind speed region. The FFA-W3-211 airfoil was used considering the characteristics such as Reynolds number, maximum lift coefficients, stall angle of attack, maximum lift-drag ratio, maximum thickness and so on. The basic profile was designated by the Strip Theory used for both of the Momentum Theory and the Blade Element Theory. From this design, there were determined the distribution of the chord length and the twist angle. To perform the aerodynamic analysis, the computational analysis method was applied. But in the operational range of the rotational blade, the local stall of the rotational blade was a difficult part for adaptation of these theories. Therefore, to cover the defect, the aerodynamic test was performed for the prototype blades.
In the structural design the structural configuration was designed for the Skin-Spar-Foam sandwich structure and it was determined to be light weight as the gradually reduction of the blade spar thickness form root to tip. The connecting area of the hub was adapted to the flange method. The material was used for the glass/epoxy certificated its properties under the domestic production. In its manufacturing there was utilized the wet lay-up and matched die molding. In the structural analysis there were utilized the FEM(Finite Element Method) and analyzed the stress and the strain. Also, there were considered the local buckling by the bending load. The rotating blade was verified from the natural frequency by the eigenvalue analysis. There was testified the satisfaction of 10years, the fatigue life by the S-N linear damage method. Moreover both structural safety and stability were verified through the full-scale structural test. Finally the pitch control mechanism using three masses and three springs was designed for easy start and prevent over speed.
주제어
#소형
#풍력발전시스템
#고효율
#공력설계
#풍력에너지
#블레이드
#회전날개
#경량화
#항공우주공학
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