大型风力机叶片主要出功部位翼型抗污特性改进

Improvement on anti-contaminating characteristic of airfoil at the main power output position of large wind turbine blade

根据某风场大型风力机叶片污染的实际状况,获得了叶片主要出功部位21%相对厚度翼型处的污染分布特点,以DU93-W-210和NACA63-421翼型为例,分析得到了污染位置和雷诺数对抗污特性影响的规律,即同一翼型在相同雷诺数下,升阻比和升力系数的下降率都是随着污染位置的后移而减小,且雷诺数越大,抗污特性越好。同时验证了DU93-W-210翼型的气动性能与抗污特性都优于NACA63-421翼型,并通过改变翼型几何参数,获得了抗污效果更好、气动性能更优的两个改进翼型,以供不同的需求选用。

The distribution feature of contaminants at 21% relative thickness airfoil section of a large wind turbine blade, where is the main power output position, is found through observing a large wind turbine blade contaminated by dust in a wind farm.And the rules are revealed through investigating the effects of the contaminant position and Reynolds number to the anti-contaminating characteristic of the airfoils such as DU93-W-210 and NACA63-421, which are that the reduction rates of lift-to-drag ratio and lift coefficient of airfoil dropped with the contaminant position backward to trailing edge on suction side at a Reynolds number, and the airfoil has a better anti-contaminating characteristic at a higher Reynolds number.In addition, it is verified that DU93-W-210 airfoil has a better anti-contaminating characteristic and aerodynamic performance than NACA63-421 airfoil.And two new airfoils obtained by changing geometrical parameters which have a better anti-contaminating characteristic and aerodynamic performance than DU93-W-210 airfoil are designed out to be chosen for the different demands.