翼型与弦长对直线翼垂直轴风力机起动性能影响的数值模拟

Effects of Blade Airfoils and Chord Lengths on the Starting Performance of Straight-bladed Vertical Axis Wind Turbines

为了探究翼型与弦长对直线翼垂直轴风力机起动性能的影响,选择了NACA0018、NACA0026、S809以及S1046四种翼型,40mm、60mm和80mm三种叶片弦长进行研究,其中S809翼型采用正装和反装两种方式。对不同条件下风力机的静态力矩性能以及转速性能进行数值模拟研究。静态力矩性能研究表明,随着叶片弦长的增大,风力机平均静态力矩增大。通过对比不同翼型的结果发现:NACA0026翼型平均静态力矩系数最大且达到稳定时间最短,S809翼型起动性能最差且反装时平均静态力矩系数最小,SI046翼型稳定转速最高。转速性能研究表明,叶片弦长的增大会增大叶片的质量,进而增大转动惯量,使得风力机的起动性能降低。本研究将对直线翼垂直轴风力机的设计提供有益的参考。

The effects of blade airfoil and chord length on the starting performance of Straight-Bladed Vertical Axis Wind Turbines(SB-VAWTs)were investigated.The airfoils of NACA0018,NACA0026,S809 and S1046 with the chord lengths of 40 mm,60mm and 80mm were selected to simulate the static torque and rotational performance of SB-VAWTs under different conditions.The airfoil S809 is installed in both forward and back ways.The research findings show that the average static torque of the wind turbine increased along with blade chord length increasing,the average static torque coefficient of NACA0026 airfoil was highest,and the S809 airfoil was lowest.The starting performance of SB-VAWTs reduced with the blade chord length increasing the blade weight increasing,and then the rotational inertia increasing.The results show that the time length for NACA0026 airfoil,from starting rotation to stability,was shortest.The starting performance of S809 airfoil was worst and the average static moment cofficient was minimum when backwardly installed.And the stable rotation speed of S1046 airfoil was highest.This study provides references for design of SB-VAWTs.