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如何有效地提高风力机叶片叶型的气动性能是风力发电技术面临的重要问题。为验证在风力机叶片叶型上表面头部加入一定频率的振荡射流可以对叶型的气动特性产生有利的影响,对实际的风力机叶片叶型进行实验研究,得到叶片的表面压力分布并进行了分析。对NACA4418叶型,当弦长Re为6.0×105时,在上表面距离头部弦长7.8%的位置加入50～500Hz频率的振荡射流都可以有效的提高叶型的升力因数,对升力因数增加射流的大小和频率存在最佳值。这一特性为提高变工况下叶片的气动效率指出了一种有益的途径。
How to effectively improve the aerodynamic performance of wind turbine blades is an important issue for wind power generation technology. In order to verify that adding a certain frequency of oscillating jet to the head of the upper surface of the blade of the wind turbine blade can have a beneficial effect on the aerodynamic characteristics of the blade, the actual blade shape of the blade of the wind turbine is experimentally studied to obtain the surface pressure distribution of the blade Analysis. For NACA4418, when the chord length Re is 6.0 × 105, adding the oscillating jets with the frequency of 50 ~ 500Hz on the upper surface from the position of 7.8% of the head chord can effectively increase the lift coefficient of the blade and increase the lift coefficient The size and frequency of the jet exist the best value. This feature points out a useful way to improve the aerodynamic efficiency of blades under varying conditions.