Development of next generation wind turbine blade design method accounting for the local flow around rotating blade

本文对涡轮机旋转叶片的绕流特性进行了实验研究，分析了叶片构型和工况对绕流特性的影响。通常的风力涡轮机叶片被设计成具有与转子的切线平行的翼型弦布置。在这种情况下，叶片在变桨轴和三维配置中具有一定的扭转角，但假设的流动是二维的。叶片设计中未考虑径向流。我们假设叶片的径向流动导致翼型截面的性能降低。在这些研究中，翼型截面根据旋转叶片的局部流动方向布置。这种叶片布置显示了翼型部分的全部性能，并且转子性能将增加。在φ3.6m风洞中对该三元叶片进行了试验。用激光多普勒测速仪（f=2000mm）测量了叶片绕流。测试了4组刀片。[1]带NACA 4418的锥扭叶片[2]带多个翼型的锥扭叶片[3]三维布置A带[2][4]三维布置B带[2]在分析中，叶片周围的速度用三维矢量表示。研究了局地环流、涡度和湍流度。

In this studies, the flow analysis around rotating blade of wind turbine and the effect on the flow by blade configurations and operating condition are investigated experimentally. The usual wind turbine blades are designed with airfoil chord arrangement paralleled to a tangential line of the rotor. In this case, the blade has some twist angle in the pitch axis and three-dimensional configurations, however the assumed flow is two-dimensional. The radial flow is not accounted for the blade design. We assumed that the radial flow o the blade causes the less performance of the airfoil section. In these studies, the airfoil sections are arranged acordings to the local flow direction of the rotating blade. This blade arrangement shows full performance of the airfoil section and the rotor performance will be increased. This three-dimensional blade is tested in the wind tunnel (φ3.6m). The flow around blade is measured with LDV (f=2000mm). The 4 sets of blades are tested.[1] Taper twist blade with NACA4418[2] Taper twist blade with multiple airfoils[3] three-dimensional arrangement A with [2][4] three-dimensional arrangement B with [2]In analysis, the velocities around blade are expressed with 3D vectors. The Local circulation, vorticity and turbulences are investigated.