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。
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 accel-eration 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.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2009年第4期412-419,共8页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(50706023)
国家科技支撑计划课题(2006BAA01A01
08&23)
广东省自然科学基金(06027186)
广东省教育部产学研结合项目(2008B090500255)
广东省科技计划项目(2007B010800034)
关键词
风力机
气动载荷
动态人流
wind turbine
aerodynamic load
dynamic inflow
