小型风力机叶片的流场仿真和应变实验研究

Flow Field Simulation and Strain Measurement Experiment of Small Wind Turbine Blades

通过有限元仿真与实验研究了叶片表面的静压分布、应变分布和不同气动载荷下叶片最大应变的变化趋势。利用FLUENT软件对200 W小型风力机额定工况进行了流场仿真,研究了叶片表面的静压分布;根据葛劳渥旋涡理论和叶素动量定理,计算了叶片的气动载荷,并利用ANSYS软件分析了叶片表面的应变分布;利用光纤光栅传感器对叶片进行了应变实验,结果表明在叶片0.6倍半径处的应变最大,且在叶片的最大应变区,ANSYS有限元计算与实验测量结果基本吻合。

The static pressure distribution, strain distribution and the trend of the maximum strain of blade were discussed through finite element simulation and experiment. The flow field simulation of 200W small wind turbine blades in rated operating conditions was conducted by CFD software FLUENT, the static pressure on the blade surface was analyzed. According to the Glauert vortex theory and blade element - momentum theory, the aerodynamic load of blade was calculated ; and the strain distri- bution was analyzed by ANSYS. The strain experiment of blade was tested by the measurement of FBG. The result shows that the strain of the 0.6 times of radius of blade is maximum. The experimental result is consistent with the ANSYS finite element calculation in the maximum zone.