两种自由尾迹模型在风力机气动性能预测中的应用  

USING TWO FREE WAKE METHODS TO PREDICT THE AERODYNAMICS PERFORMANCE OF HAWT

作　　者：沈昕[1] 竺晓程[1] 杜朝辉[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《太阳能学报》2010年第7期923-927,共5页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(50576052);博士点基金(0060248036)

摘　　要：分别采用空间迭代法以及时间步进法的自由尾迹计算模型对风力机的尾迹进行预测。结合相应的算例以及模型特点预测风力机在正对来流、偏航以及变工况下的风力机尾迹形状并与相应的实验值进行比较。结果表明,在计算稳态工况时,空间迭代法可以快速稳定的预测出尾迹形状,而时间步进法在计算稳态工况时可以很好的收敛到初始值,而其瞬态特性保证该方法可以计算风力机在变工况下的气动特性。两种方法得到的尾迹形状基本反映叶尖涡结构的特性,可以用来作为升力线、升力面等工程模型算法的尾迹部分,用以进行水平轴风力机的气动性能预测。Two different methods of free wake were used to predict the aerodynamics performance of horizontal axis wind turbine. Both wake model combined with certain blade model were then used to predict the geometry of the tip vortex of the wind turbine and the airloads of the blade for a wind turbine tested under certain control condition. It has been showed that relaxation free wake model can help to improve the stability characteristics of the scheme and enhance the convergence under steady state working eondition and the time-marching method can accurately predict the transient wake geometry to obtain accurately the unsteady airloads and power output of the wind turbine.

关 键 词：自由尾迹 空间迭代 时间步进 水平轴风力机 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]