Analysis On Wind Dynamics Inside A Wind-turbine With Fixed Blade And Consstant Rotation-speed

In this paper, GCN1000S wind turbine model is selected to study. Firstly, wecollected the data of the performance parameters on the basic wind turbine airfoil, andthen the GCN1000S model parameters of wind turbine is obtained by interpolationmethod using the basic airfoil performance parameters, after that we test the lift and dragcoefficients on the blade sections using the numerical simulation method, obtained thewing data which is actually and reliable, thereby we established a two-dimensionalcalculation model. We take the numerical analysis based on the blade element momentumtheory (BEM method), get the power curve and efficiency curve of wind turbine. Thepower curve is agree well with the experimental results, which verifies the correctness ofthe model. On this basis, we calculated the flow around the structure of wind powergenerator using the two-dimensional model, and obtained the flow field velocity at theanemometer which is different with the coming wind speed, which shows that originalmethod that manufacturers anemometer located as wind velocity is not appropriate, thecorrection is need.In order to make clear the relationship between the flow velocity and the wind speedof the anemometer, we need to further develop3D precise analysis of flow fielddistribution in the vicinity of the wind turbine structure. Firstly, according to themanufacturer ’Solidworks-model’ into the the wind turbine geometry. By the currentactuator disc concept in this field to set up the3D model of flow field analysis. Afterdivided into appropriate discrete mesh, through CFD analysis, were calculated in differentwind speed conditions, the velocity distribution near the wind turbine structure and windspeed size of the anemometer, get the wind speed of anemometer is about80%of thecoming flow velocity. In order to further determine the proportion coefficient between theflow speed of anemometer and the coming flow velocity, we conducted the wind turbinepower calculation and the flow field using the numerical simulation of the wind turbinebased on3D CFD method, the use of three different rotation model for numerical solution,the results of wind turbine power curve which predict by sliding mesh model is more closeto the measured results in trend, determining the ratio of wind speed at the anemometer and flow speed is about86%-93%. Wind turbine power curve is more close to themeasured results both in the numerical value and the trend after the wind velocity werecorrected.The solutions have important guiding significance for the design and computationalanalysis of the wind turbines.