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中文摘要：
本文基于动量叶素理论推导了预弯式风力机叶片气动变桨力矩的定性表达式，分析了在理想优化条件下力矩的变化趋势，与直叶片进行了比较，并采用FOCUS商业软件进行了计算分析。结果表明，在正常攻角范围内，气动变桨力矩与桨距角增大方向一致，叶片预弯可以在一定程度上增大气动变桨力矩，从而减小总体变桨力矩。
英文摘要：
Based on the blade element-momentum theory, the qualitative expression of aerodynamic pitch moment of pre-bend wind turbine blades was obtained, and its trend under ideal conditions was analyzed. The results were compared with those of the straight blades, and were computed using commercial software FOCUS. In the normal range of attack angles, the direction of aerodynamic pitch moment is the same with that of the increasing pitch angles. Pre-bend can increase aerodynamic pitch moment to a certain extent, and thereby can decrease total pitch moment.
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