一种垂直轴螺旋形风力叶轮附近的三维湍流特征

Three-Dimensional Turbulent Characteristics Near a Spiral Wind Rotor

以FIN翼型作为基本翼型,设计了一种垂直轴螺旋形风力叶轮。运用商用CFD软件Fluent对叶轮附近的三维湍流场进行了非定常数值模拟,分析了基本截面在不同迎风角度下的受力特征,获得了在最大力矩系数工况下流场中的流速和压力系数分布,并对比分析了不同扭角时的力矩系数。研究结果表明:采用不同迎风角度基本截面上的合力方向有较大差别,整个叶片上的力构成了复杂的力系;在最大力矩条件下,随着叶轮高度的变化,叶轮内的气流扩散区逐渐增大,压力系数分布逐渐减小;在不同叶片扭角条件下,力矩系数在叶轮旋转过程中的波动特征不同,90°叶片扭角力矩波动幅度较小,运行相对稳定。

Profile of the FIN—MP airfoil was used as the basic section of spiral vertical axis wind rotor blade.At the same time,three-dimensional and unsteady simulation was carried out for the flow field around wind rotor by using the commercial CFD software.Analysis the force characteristic of the basic airfoil in different angles,obtained the velocity and pressure coefficient and other aerodynamic performance parameters near the impeller under the maximum moment coefficient,comparing the moment coefficient of the wind turbines in different angles.The results indicate that the direction of the force has larger difference with the different wind angle,the whole leaf force on form complex force system,the force on the blade form complex system.Under the maximum moment coefficient,with the changes of the height,the diffusion area of speed drafting is gradually increased and the distribution of the pressure coefficient is gradually decreased.Because of different distortion angles,the fluctuation character of the moment coefficient are different,when the distortion angles of the wind turbines to 90 degrees,the spiral vertical axis wind turbines would run relatively stable.