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

本文通过实验研究了风力机旋转叶片的流动分析以及叶片结构和运行条件对流动的影响。通常的风力机叶片设计为翼型弦排列，平行于转子的切线。在这种情况下，叶片在俯仰轴上有一定的扭转角度和三维构型，但假设流动是二维的。径向流动没有考虑到叶片的设计。我们假设叶片的径向流动导致翼型截面的性能下降。在这些研究中，翼型截面按照旋转叶片的局部流动方向排列。这种叶片布置充分显示了翼型截面的性能，并将提高旋翼的性能。该三维叶片在风洞(φ3.6米)中进行了试验。用激光测速仪(f=2000 mm)测量了叶片周围的流动。对4组叶片进行了试验：[1]NACA4418锥形扭转叶片[2]多翼型锥形扭转叶片[3]三维布置[2][4]三维布置[2][2]三维布置B[2]在分析中，叶片周围的速度用三维矢量表示。对局地环流、涡度和湍流进行了研究。

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.