Numerical Simulation Of Aerodynamic Performance For Horizontal Axis Wind Turbine

An accurate predicting on the aerodynamic performance of wind turbine blades can offer effective guidance on the practical operation of wind turbine and the design of wind turbine blades. Aiming at this subject, the essay firstly established a three-dimensional model of the wind turbine based on a horizontal wind turbine and simulated the three-dimensional aerodynamic performance of the wind turbine based on smooth surfaces of blades and compared with the experimental data to verify the validity of the model, and simulated the effect of different dust thickness according to the actual operating situation of the three-dimensional aerodynamic performance, at last a new method which proposed to determines the experimental parameters of the scale model of wind turbine based on the critical Reynolds number of leaves and the similar principle, in order to achieve saving expermental cost and improve the effectiveness of wind tunnel test. The content and conclusion of the reaserch are following:Numerical investigations on the effect of blade surface dust thickness, on the three-dimensional aerodynamic performance was performed. Fisrtly, the establishment of a three-dimensional model of the wind turbine based on a horizontal wind turbine and simulated the three-dimensional aerodynamic performance of the wind turbine based on smooth surfaces of blades and compared with the experimental data to verify the validity of the model. Then, simulated the effect of different dust thickness according to the actual operating situation of the three-dimensional aerodynamic performance and calculated the pressure and velocity distribution according different dust thickness. The results showed that dust thickness had great influences on the three-dimensional aerodynamic characteristics of wind turbine. With the dust thickness increasing, the wind speed on both sides of blades reducted obviously, the irregular of air flow increased, the pressure difference between the preesure side and suction side decreased and the efficiency of wind turbine decreased accordingly.Determining the experimental parameters of the scale model of wind turbine is a first step and has a pivotal role in wind tunnel experiments. Based on the above three-dimensional simulation of the flow around the wind turbine blades, a new method proposed determines the experimental parameters of wind turbine based on the critical Reynolds number of leaves and the similar principle. First, calculating the aerodynamic characteristics of the variation with Reynolds number to determine the critical Reynolds number and the experimental parameters of wind turbine. Second, On the basis of the original model and the experimental model of wind turbines'geometric dimensions and wind speed, the numerical simulation of two model situations are carried out by CFD respectively and calculate the pressure distribution, the velocity distribution and the induced velocity distribution. The results show that the method is feasible.