凹变翼型对风力机气动性能影响的实验研究

为改进课题组自行设计某S型翼型结构,提高300 W小型水平轴风力机气动性能,本课题重点研究翼型吸力面凹变对风力机气动性能的影响.利用二阶迎风格式、S-A湍流模型数值模拟方法及内蒙古工业大学风能太阳能利用技术教育部重点实验室检测设备,探究风力机在3种定常风速、9种叶尖速比共27种工况下风轮的功率系数、功率、转矩等气动参数...

EXPERIMENTAL STUDY ON INFLUENCE OF CONCAVE AIRFOIL ON AERODYNAMIC PERFORMANCE OF WIND TURBINE

To optimize the S-shaped airfoil structure and improve the aerodynamic loads of a 300 W small horizontal axis wind turbine designed by our research group,this paper focuses on the airfoil concave on suction surface.The rotor power coefficient,rotor power and rotor torque under 27 working conditions including 3 constant wind speeds and 9 tip speed ratios are investigated using the second-order upwind scheme,S-A turbulence model and the experiment equipment in the Key Laboratory of Wind Energy and Solar Energy Utilization Technology of Inner Mongolia University of Technology.It is found that the lift coefficient of concave airfoils increase significantly and the drag coefficient decreases slightly.When the angle of attack is 0°,the maximum additional value of lift coefficient is about 15.63%,and the stall angle of attack is delayed by 1°.The concave airfoil can guide the gas circulation at the concave position of suction surface,reduce the unsteady fluctuation of airflow,and delay the turbulent diffusion on the blade surface to decrease the energy loss.Compared with the original airfoil,the rotor power coefficient,rotor power and rotor torque with concave construction at rated conditions increases by 2.24%,1.55%and 5.36%.