Research On Numerical Simulation Of Dynamic Properties Of Wind Turbine With Blade Twisted

Wind turbine is a critical equipment in wind power generation system, whose dynamic property impacts the efficiency of wind power generation system directly. This paper is a research which the blade of horizontal axis wind turbines is twisted. In order to decrease the vortex on the blade tip and the flow loss and bring the power augmentation, and is that the more wind energy is converted to the electric energy, based on using wind power fully and the need to achieve the aim of the distributional wind power generation, this paper take Nanjing tianneng FDP1.3-200W horizontal axis wind turbine as primitive model , apply technology method based on N-S equation, 3-D, steady, implicit solve, turbulence model of k-ωSST, discretization of SECOND ORDER UPWIND and pressure-velocity coupling of typical SIMPLE scheme, simulate dynamic magnification performance of horizontal axis wind turbine and horizontal axis wind turbine by software of CFD----FLUENT.In this paper ,we take the maximal cross section of blade root as a datum( 0°), to research dynamic property of wind turbine under the same wind speed and a range of tip speed ratio or the same wind speed and a range of wind speed, in the condition of different torsion angle of blade tip cross sectionγ= 2°, 1°, 0°, -1°, -2°, -4°,……, -,20°("+" expresses the clockwise torsion, "-" expresses the anticlockwise torsion, the centre cross section torsion angle is computed by linearity interpolation law) . At last , we arrive at a conclusion that wind torsion change regularity of power augmentation of a wind turbine. It accord with the change tendency of the wind turbine theory. Then compare the models of the torsion blade of maximal power amplification and primitive blade, compute the power change condition over the same tip speed ratio and a range of wind speed. The results shows twisting blade have the augmentation action surely. Subsequently the pressure performance and velocity performance of the wind turbine with the blade being twisted are compared with the primitive wind turbine, and we gained the change of the blade tip of the wind turbine with the blade being twisted. Thereby we analyze and disclosure the dynamic augmentation principle of the wind turbine with the blade being twisted.The research of this paper show that the twisted blade change the aerodynamic characteristics and the power, pressure, velocity performance of wind turbine, which is the rule. This has a guide meaning to the blade design of miniature wind turbine. And the research method and conclusion can be used by other kind of wind turbine also.