可变叶片安装角立轴风力机的转动力矩计算

TORQUE CALCULATION OF VERTICAL AXIS WIND TURBINE WITH VARIABLE STAGGER ANGLE BLADE

为提高立轴风力机的效率,对可变叶片安装角的立轴风力机进行了分析,根据机翼升力与阻力的理论,在固定来流风速和旋转速度下计算了叶片在每个方位角上产生力矩最大的最佳安装角的变化规律,为了更好的运行,对最佳安装角的变化规律进行了一定修改。计算比较了固定安装角度的叶片与可变安装角度的叶片旋转一周产生的力矩,结果表明叶片在最佳安装角下运行时,每一转的正力矩都有明显增大,平均力矩可提高14倍。多个叶片在最佳安装角下运行时的力矩变化较平稳。可变叶片安装角立轴风力机是一种有发展前途的动力设备。

In order to improve the efficiency of vertical axis wind turbine （VAWT）, the VAWT with variable stagger angle blade was studies. Optimum blade stagger angle was calculated for wind turbine maximum torque at fixed inlet wind velocity and rotational speed by the theory of aerofoil blade＇ s lift and drag. And the optimum blade stagger angle was modified for better run. The torque of VAWT with fixed stagger angle blade was compared with that of VAWT with variable stagger angle blade. Results show that the positive torque in each cycle is increased evidently and the average torque is increased by 14 times at optimum blade stagger angle. VAWT with multi-blade at optimum stagger angle provides capacity of smooth power and torque performance. It may be concluded that VAWT with stagger variable blades is one kind of promising power equipment.