COMPUTATION AND ANALYSIS OF AERODYNAMIC PERFORMANCE OF WIND TURBINE BLADE BASED ON BEM

Blade is the core component of a wind turbine to capture wind energy, the aerodynamic performance and reliability of blade is thusly the key to the safe operation of a wind turbine. In this paper, a 1.5 MW wind turbine is taken as the research object. The distribution of aerodynamic load on the blade of the wind turbine is computed by GH Bladed computational software, and the influence characteristics of wind speed and tip speed ratio on the aerodynamic load of the blade are analyzed. The analysis results show that: the axial load value is far greater than the tangential load value, the axial load value decreases along the blade tip to the blade root, and the axial load distribution curve becomes more and more gentle along the span with the increase of wind speed; in the aerodynamic load of the blade root, the axial thrust and the bending moment in the swing direction play a controlling role, and increase monotonously as the wind speed increases to the rated wind speed; when the tip speed ratio increases to 5, the axial load distribution curve is gentle and the peak value decreases; when the tip speed ratio increases from 7 to 11, the axial load appears at the tip again and the peak value increases significantly; when the tip speed ratio increases to 7, the tangential load increases gradually; when the tip speed ratio increases from 7 to 11, the tangential load decreases; the axial thrust and the bending moment in the swing direction play a controlling role in the aerodynamic load of the blade root; with the increase of the tip speed ratio, the bending moment in the swing direction increases first and then decreases.