【摘要】 针对叶素动量理论在实际运用中存在的问题,对叶素动量理论进行较系统的分析,认为其有两种计算模型.以模型Ⅰ为例,提出两种计算流程,建立以风轮运行风速范围内风能利用系数最大,以叶片弦长、叶尖速比为设计变量的优化设计模型,计算中考虑分段叶尖损失计算方法.针对8kW水平轴风力机叶片的计算表明,计算方法稳定、可行.根据设计要求,对叶片弦长、叶尖速比进行优化设计.通过计算获得叶片结构参数和叶片性能参数随叶片展向、风速的变化关系,同时获得风力机的最佳运行风速范围.计算结果可为风力机叶片设计和评估提供参考.更多还原

【Abstract】 Aimed at the problems in application of blade element momentum(BEM)theory in practical design procedures,the systematic analysis of BEM theory is made and it is recognized that there exist two calculation models.Taking model-Ⅰ as an example,two calculation procedures are put foreword and an optimization model is set up,taking the power coefficient in a given wind velocity range as object function and the blade chord and blade tip speed ratio as design variables.During the optimization,the tip loss evaluation method for different ranges is also taken into account.It is shown by the computation of a 8-kW horizontal-axis wind turbine blades that the optimization method is stable and feasible.According to the design requirement,the blade chord and tip speed ratio are designed with optimization.During the calculation,the relations of structure parameters and performance parameters with radial position of blade and wind velocity are obtained respectively.The optimum wind velocity range of wind turbine operation is also obtained.The computation results can serve as a reference in design and evaluation of wind turbine blade.更多还原