Bezier函数型弯叶片及其在带遮风罩垂直轴风力机中的应用  

Bowed Blade Based on Bezier Function and Its Application to VAWT

作　　者：胡永海[1] 童正明[1] 王珊珊[1] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《动力工程》2009年第12期1155-1159,1167,共6页Power Engineering

摘　　要：引入X弯度与Y弯度2个参数,提出了一种基于Bezier函数思想的叶型几何参数设计方法,通过分析传统垂直轴风力机效率低的原因,在此基础上提出了一种带有遮风罩的垂直轴风力机,并将基于Bezier函数生成的弯叶片应用于该风力机中.通过CFD数值模拟方法,研究了该风力机的气动特性,以及各种叶片的弯曲形式对其气动性能的影响.结果表明:遮风罩可以有效降低因来流对动叶轮吸力面的直接冲击而造成的阻力扭矩,风力机平均扭矩可提高107%;叶片的弯曲程度是由X弯度和Y弯度共同作用的结果,当X弯度与Y弯度在一定范围内具有局部最优值时,所形成叶片的垂直轴风力机的气动性能最佳,与普通半圆形叶片相比,风力机总扭转矩提高了33.8%.A new design method of geometric profile parameters based on Bezier function is proposed by introducing two parameters,i.e.X-camber and Y-camber.By analysing the reason of low efficiency for vertical axis wind turbines（VAWT）,a new type of VAWT with windshield was proposed,and the above bowed blade technique was applied in the new type of VAWT.Through CFD numerical simulation,the aerodynamic performance of VAWT with windshield was studied,as well as the effects on it with various types of bowed blade.Results indicate that the windshield can effectively reduce the drag torque caused by direct impact of the coming flow on the suction side of the rotors,thus enhance the driving torque of the VAWT by 107%.The bowed degree of a blade is a result of combined action by X-camber and Y-camber.In a certain range of the optimum value of X-camber and Y-camber,the blades applied in VAWT with windshield could obtain the best aerodynamic performance.Compared with the VAWT with semicircle blade,the value of total tongue can be improved by 33.8%.

关 键 词：垂直轴风力机 弯叶片 弯度 Bezier函数 气动性能 遮风罩 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]