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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。
Taking the real leaves of the field surveyed as the research object, representative leaf tips and leaf-root airfoils were intercepted and their unsteady characteristics were compared. The results show that the tip airfoil running at a small attack angle (2.93 °) induces an extremely complicated vortex structure due to the combined action of a relatively large surface roughness and an enlarged trailing edge thickness, so that the lift resistance coefficient Showing the periodic variation and the pressure showed a complex dynamic distribution. However, due to the combined effect of its large working angle (11.273 °) and increased tail thickness, the aerodynamic forces presented unsteady aerodynamic forces and the flow field was strongly large The results show that the same blade has different surface roughness, different angle of attack and trailing edge thickness. Different vortex structures can be induced in different airfoil sections, leading to complex unsteady aerodynamic characteristics of the blade.