Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
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Self-Starting Characteristics of Blades for Vertical Axis Wind turbine

수직축 풍력발전용 날개의 기동력특성

  • Received : 2019.12.20
  • Accepted : 2020.02.13
  • Published : 2020.03.31
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Abstract

A study has been done for self-starting torque of vertical axis wind turbine blade. It is especially concentrated to evaluate the torque coefficient before starting rotation. Two different aerofoils(AMI903 and AMI904) are proposed to benchmark the possible best blade(supercritical airfoil) for self-starting performance. Torque coefficients in the tangential direction of rotation are given with respect to the angle of attack in terms of drag coefficient and lift coefficient. Torque coefficient shows that the effect of Reynolds number is minimal. The thicker blade(AMI904) between two different proposed airfoils has bigger torque coefficient, which is attributed to lower lift coefficient and higher drag coefficient.

풍력발전기 로터의 저속운전 가능성에 대해 기동토크를 평가하고자 하였다. 본 연구에서 살펴본 저속시동 가능성의 날개는 초임계에어포일을 보완하여 AMI계열(AMI903 및 AMI904)의 날개를 제안하여 공력성능을 유지하며 제작상 및 유지보수의 어려움을 제거하였다. 따라서 본 연구는 FLUENT를 이용하여 난류유동 해석을 통해 제안된 날개의 받음각(-180°~+180°)에 대한 항력계수와 양력계수를 제시하였으며, 이 값들로부터 정지하고 있는 날개의 회전 위치에 따른 접선방향의 토크계수를 정의하여 제시하였다. 기동력의 크기와 방향을 결정할 토크계수는 대부분 양의 값(반시계방향)으로 나타났으며 특별히 받음각이 0°에서 180° 및 -90°에서 -180°에서 양의 값이며 0°에서 -90°에서 매우 작거나 음의 값을 나타냈다. 한편 기동토크는 두께가 얇은 AMI903보다 두꺼운 AMI904에서 더 큰 것으로 나타났다.

Keywords

References

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