极端阵风条件下大型风力机叶片极限载荷研究

EXTREME LOAD ANALYSIS OF LARGE SCALE WIND TURBINE BLADE UNDER EXTREME GUST CONDITION

基于修正叶素动量理论,考虑经验修正、动态失速、动态入流等因素,结合叶片气动弹性响应问题,对大型风力机叶片在极端阵风条件下的极限载荷进行研究。以某MW级水平轴风力机叶片为例,研究动态失速、阵风上升时间、变桨速率等因素对叶片极限载荷的影响。结果表明,随着叶片大型化的发展,极端阵风条件下的极限载荷问题对风电机组的整机性能有较大影响。

The extreme load analysis of large scale wind turbine blade due to the extreme coherent gust with direction change condition was carried out based on improved BEM theory with considering empirical correction, dynamic stall and dynamic inflow, and combining with aeroelastic response issue of the wind turbine blade. The blade of certain MW horizontal axis wind turbine was chosen to study the effect of dynamic stall, rise time of gust and pitch rate on the extreme load of blade. The results show that along with the persistent development trend of large wind turbines, the extreme coherent gust with changed wind condition has a great influence on the performance of wind turbine.