H型垂直轴风力机气动参数对主轴偏振效应的影响

Influence of aerodynamic parameters of vertical axis wind turbine on vibration effect of main shaft

针对1种1.5 MW H型对称翼垂直轴风力机(VAWT),采用双致动盘多流管理论,分析主轴偏振效应的产生机理,提出采用变差系数来衡量主轴合成力的振荡程度,并对不同风力机参数对偏振效应的影响进行分析。研究结果表明:风力机叶片在旋转1周范围内产生的气动力合成到主轴位置上后不能互相抵消,发生振荡且作用方向不定;对于大型垂直轴风力机,风剪效应的存在有利于降低主轴偏振效应;在H型垂直轴风力机气动设计中,当叶片数为3片时,主轴振动幅度最小;当高径比为0.5088时,主轴振动幅度最小;当展弦比为14.2015时,主轴振动幅度最小。

The mechanism of the vibration effect of the main shaft of a1.5MW H-type vertical axis wind turbine(VAWT)with the symmetrical wing was analyzed according to the double-multiple stream tubes theory.The variation coefficient was proposed and used to measure the oscillation degree of the synthetic force on the main shaft,and the influence of wind turbine parameters on the vibration effect was analyzed.The results show that the synthetic force on the main shaft,which is produced by the blade in a cycle of operation,is wavy and cannot counteract each other.For huge vertical axis wind turbine,the wind shear effect is beneficial to reducing the vibration effect.For the design of H-type vertical axis wind turbine,when the number of blades is three,the vibration amplitude of the main shaft is the smallest;when the height diameter ratio is0.5088,the vibration amplitude of the main shaft is the smallest;the vibration amplitude of the spindle is the smallest when the aspect ratio is14.2015.