摘要
采用非定常k-ω湍流模型和滑移网格技术,对旋转直径3 m、高3 m和叶片弦长0.44 m的直叶片升力型风轮动力特性进行二维数值研究,分析在三种不同转速下单叶片动力特性、叶轮动力特性及叶片表面压力特性的变化规律。研究发现:随转速增加,上盘面叶片动力矩极高值先增加后减小存在最大值,下盘面动力矩极低值在逐渐减小且范围变广,证明上盘面为风轮的主要做功区域,下盘面对风轮出力贡献少甚至为负值;随转速增加,上盘面叶片表面压力差在增大,吸力面负压增加幅度较明显,压力面增加幅度较缓,证明吸力面对出力增加的贡献更大;叶轮整体出力由上盘面力矩、下盘面力矩和转速三个因素决定,只有均衡三者关系才能增大风轮整体出力。
The unsteady k-ω turbulence model and the sliding grid technology are used to research on the aerodynamic characteristics of straight vertical axis wind turbine in two-dimensional numerical study.The wind turbine has three 3 m-diameter,3 m-height and 0.44 m-length airfoil blades.Aerodynamic characteristics of a single blade and of the wind turbine and the pressure characteristics of blade surface in three different rotation speeds are researched.The results conclude that：With the rotation speed arising,the pressure difference of the blade two surface sides is increasing;The pressure side has a tiny increasing,the suction side has a much bigger increasing,and this proves the suction side has a bigger contribution to the increasing power.With the speed increasing,the maximum torque of blade in upstream half circle increases firstly and decreases later,and has an optimum rotation speed with a bigger maximum torque;while the torque of downstream half circle decreases even is a negative value;these prove the upstream circle is the main power production zone.The whole power is determined by the torques of the upstream half and of the downstream half circle and rotation speed,only the relationships are balanced then the rotor power could be promoted.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2012年第24期147-151,共5页
Journal of Mechanical Engineering
基金
中央高校基本科研业务费专项
江苏高校优势学科建设工程资助项目
关键词
升力型风轮
压力特性
风轮转速
滑移网格
Lift-type wind rotor
Pressure characteristic
Rotation speed
Sliding grid
