基于外场风力机翼型的非定常特性研究

INVESTIGATION ON UNSTEADY CHARACTERISTICS BASED ON OUTFIELD WIND TURBINE AIRFOIL

以测绘的外场真实叶片为研究对象,截取有代表性的叶尖和叶根翼型,对比研究其非定常特性。结果表明:运行在小攻角(2.93°)下的叶尖翼型,由于其表面相对较大的粗糙度和增大的尾缘厚度联合作用诱导出极其复杂的旋涡结构,使其升阻力系数呈现周期性变化规律、压力呈现复杂的动态分布形式;而叶根翼型由于其大功角(11.273°)运行和增大的尾缘厚度联合作用,导致气动力出现非定常变化,流场出现强烈的大尺度旋涡结构;说明同一叶片表面粗糙度不同、运行攻角及尾缘厚度不同,会在不同翼型断面诱导出不同的旋涡结构,导致叶片出现复杂的非定常气动特性。

On the basis of surveying and mapping of the outfield true blade, the intercepted typical tip airfoil and root airfoi be comparative studied the unsteady characteristics. The results showed that when the tip airfoil run in a small angle of attack（2.93° ）, due to its relatively large surface roughness and the increased trailing edge thickness, extremely complex vortex structure is induced, Cause it＇ s cyclical lift and drag coefficients of the variation, showing the pressure distribution in the form of a complex dynamic. Due to its large angle of attack （ 11.273~ ） operation and increased trailing edge thickness combined effects, root airfoil aerodynamic performance run unsteady and the flow field of large scale vortex structure appears strong. The blade of the surface roughness different, different operation of attack and the trailing edge thickness, the different vortex structure will be induced in the different airfoil sections, caused the blade to appear unsteady aerodynamic characteristics.