Aerodynamic Load Analysis for Wind Turbine Blade in Uniform Flow and Ground Shear Flow

균일 흐름과 지상 전단 흐름에 놓인 수평축 풍력터빈 블레이드의 공력 하중 비교

  • 김진 (전북대학교 항공우주공학과 대학원) ;
  • 유기완 (전북대학교 항공우주공학과)
  • Published : 2007.11.06

Abstract

Recently the diameter of the 5MW wind turbine reaches 126m, and the tower height is nearly the same with the wind turbine diameter. The blade will experience periodic inflow oscillation due to blade rotation inside the ground shear flow region, that is, the inflow velocity is maximum at uppermost position and minimum at lowermost position. In this study we compare the aerodynamic data between two inflow conditions, i.e, uniform flow and normal wind profile. From the computed results all of the relative errors for oscillating amplitudes increased due to the ground shear flow effect. Especially My at hub and $F_x$, $M_y$, $M_z$ at LSS increased enormously. It turns out that the aerodynamic analysis including the ground shear flow effect must be considered for fatigue load analysis.

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