【摘要】 为揭示柔性叶片受力后的变形状态对叶片气动性能的影响规律及原因,本文利用Fluent软件,采用RNGκ-ε湍流模型,选取柔性叶片受力变形过程中14个状态下的叶片作为研究对象并设定相同边界条件进行数值模拟计算,得到每组叶片上的压力分布、流场分布情况以及升力系数值;基于翼剖面理论和叶型附面层迁移理论,对比了14组叶片的升力系数值、附面层分离及涡流形成和发展的状态。结果表明:柔性叶片最佳迎角为20°,最佳曲率为0.019;曲率较大的叶片在接近后缘点区域吸力面上易发生附面层分离,会导致升阻比减小,造成能量损失,降低叶片的气动性能。更多还原

【Abstract】 For the purpose of revealing the relationship between deformation and aerodynamic characteristics,fluent software was used as simulation tool and RNGκ-εmodel was used as turbulence model in numerical simulation.Working condition includes same boundary conditions and 14 groups of blades that can instead of 14 kinds of instantaneous form in blade deformation.Pressure distribution and flow field and lift coefficient of 14 groups of blades were acquired in numerical simulation.Based on theory of airfoil section and migration of boundary layer theory and by analyzing lift coefficient values and boundary layer separation and vortex on the 14 groups of blades,flexible blade’s best attack angle and best curvature are obtained.20°is the best attack angle and 0.019 is the best and curvature.Results show that the boundary layer separation more easily appears on suction surface of great curvature blades,it will results in decreasing blade’s lift-drag ratio and aerodynamic performance and losing energy.更多还原