【摘要】 针对叶素—动量理论的不足,考虑风力机运行环境动态变化时诱导速度场的滞后效应,利用加速势流方法,导出了附加质量的表达式,并以此建立新的风轮轴向受力表达式,与叶素—动量理论结合,得到了考虑动态入流效应的动态气动载荷分析模型。利用分析模型对一台1.25MW风力机在风速快速变化和快速变桨距时的载荷进行了仿真,结果表明,模型能够较好地反映诱导速度场的渐变过程、载荷的快速过冲现象以及之后逐渐回归稳态值的过程。更多还原

【Abstract】 According to the limitations of the Blade Element-Momentum(BEM) theory,the time-lag effect of the induced velocity field of the wind turbine when operating in unstationary environment was taken into account.Applying the acceleration potential method,the expression of added mass was derived,and a new thrust equation was established to amend the BEM theory.Consequently a transient aerodynamic load prediction model considering the dynamic inflow effect was presented.Adopting the model,simulations of transient load for fast change of wind speed and pitching of a 1.25MW wind turbine carried out.The simulation results indicate that the presented model can preferably predict the time-lag effect of the induced velocity field,the large overshoots of loads and the subsequent procedure of gradually returning to the equilibrium value.更多还原