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主要研究了风力机叶片表面附着物对其气动性能的影响。实验采用粘土作为附着物模拟叶片表面前缘结冰及结垢,模拟有附着物后叶片周围流场的变化、叶片升力及阻力系数的变化,并与原叶片的气动性能进行对比。比较分析了不同攻角下叶片外部压力分布的变化规律,计算分析了外部压力分布对表面附着物力学特性影响规律。该文实验攻角为-4°～24°,温度为250.37K。分别对比了叶片附着物的厚度和长度对叶片性能的影响,通过对比升力及阻力特性,发现与原叶片相比,附着物叶片的升力系数普遍减少,并随附着物长度和厚度的增加,升力系数降低得更剧烈。附着物是造成叶片气动性能恶化的主要原因。
The main study of the wind turbine blade attached to the aerodynamic performance. In the experiment, clay was used as an attachment to simulate the icing and scaling of the leading edge of the blade surface, simulating the change of the flow field around the blade with attached matter, the change of blade lift and drag coefficient, and the comparison with the aerodynamic performance of the blade. The variation rules of the external pressure distribution under different angles of attack were analyzed comparatively. The influence of the external pressure distribution on the mechanical properties of the surface attachments was analyzed. The experimental attack angle is -4 ° ~ 24 ° and the temperature is 250.37K. The effects of leaf thickness and length on blade performance were compared respectively. By comparing the lift and resistance characteristics, it was found that the lift coefficient of the leaf of attachment was generally lower than that of the original leaf, and the increase of the length and thickness of attached leaf, Coefficients decrease even more dramatically. Attachment is the main reason for the deterioration of the aerodynamic performance of the blade.