Research On The Aerodynamic Load Of Wind Turbine Blade Model

It is based on "the experiment and research of Wind Wheel series of the Wind Generator which is provided by the financial aid of National Natural Science Foundation.[Approval number: 59776033], which is a basal experimental study for the questions existed in wind rotor blade of MW wind generators in China. The outside truck-mounted method was used for the experiment research in characteristics of the aerodynamic loads of 1MW, 1.5MW and 2MW wind turbine blade model, power output characteristics of generators and generator sets , comparing and analyzing the experimental results of 1.5MW with the analytical results of gas dynamic load of the wind turbine rotor blade in the ANSYS program, analyzing the impact on the blade design of the blade dynamic loads, and the design on theory of the key parameters of MW wind power generator serial was initial established.The 200kW large wind turbine generator blade was designed and manufactured after a great deal of foundation work, which was tested in Shen Yang with a good effect. Based on the above study, the 1MW, 1.5MW, 2MW new special blades of the wind turbine generator were designed and made. According to the requirements of the GB / T 10760.2-89, with nine kinds of wind speed of 3m / s, 5m / s, 7m / s, 9m / s, 11m / s, 13m / s, 15m / s, 17m / s, 19m / s on wind turbine blade model, the power output characteristics and aerodynamic loads characteristic parameters was tested by the outside truck-mounted method and strain gauges testing technology, and the experimental results were theoretically analyzed. Three kinds of blade models were used in 100W wind power generation system, and six sections were selected in the test. To the section position sizes of 1MW and 2MW blade model were determined by similar proportion based on the 1.5MW. Experimental results show that:The propeller pitch angle was an important parameter in wind turbine, which had great impact in aerodynamic characteristics of the wind turbines. In the experiments of 1.5MW blade model, the design wind speed of 12m / s and 30 o pitch angle, the wind turbine output power were 78.6W. The starting performance tests of 1MW, 2MW wind turbine blade model designing found that pneumatic wind speed were 5.4m / s and 3.5 m / s. Therefore, the starting performances of 1.5MW and 2MW wind turbine blade model were better.For the static load test, the section deformation displacement of 1.5MW blade model was small and the stiffness of blade was relatively large with loads; and the section displacement of blade was linearly increased with the increasing of the radius of the wind rotor when design the loads, however the section displacement increased fleetly, indicating that the stiffness of blade was significantly decreased.There were the same load characteristics of 1MW, 1.5MW and 2MW blade model, which the tensile stress, shear stress and torque of section were linearly increased with increasing of wind speed; and tensile stress of all test sections of the blade was changed greatly, but shear stress was basically the same in the same wind speed. The shear stress and tensile stress were increased obviously in the place of 388mm to centre of gyration of wind rotor comparing with other section where the phenomenon of stress concentration had for 1.5MW blade model.The speed of 1.5MW wind turbine blade model reached 400 rpm when the wind speed was 14.6m / s, but wind energy utilization coefficient of the wind rotor was 0.062, which indicated MW wind turbine blade model and 100W were not match. The method of combining the innovative application layer unit SHELL91 and the solid element SOLID45 unit was simulated according to the actual structure of a new dedicated 1.5MW blade model, and the nodes was rigidly connected with coupling of freedom degree, which the key of two different types of cell node was that the suitable meshing and overlapping tolerance were selected. Otherwise, there were errors in load calculation using ANSYS software, which was a new attempt.The analysis of shear stress of the new dedicated 1.5MW blade model with the simulation technology of the ANSYS finite element, the results of the simulation data and the vehicle test data were coherent, and the changes of stresses in various sections of blade were basically consistent ; simultaneously the simulation and the experimental results of the amount of displacement of each section were basically consistent, the maximum relative error was 9.55% and the minimum error was 2.38% at rated wind speed of 12m / s in each loaded section, which the large errors were near the blade roots and less errors were close to the tip. It was proved that the method of the force analysis was basically reasonable, reliable and credible, which had important guiding significance to the load analysis and optimal design of MW wind turbine.The experiments of 1MW, 1.5MW and 2MW blade model were made by the outside truck-mounted method and testing technology. The experimental result was verified correctness with simulation of the ANSYS finite element, verified the feasibility and reliability of the research methodology. The problem was solved and the new ways was brought forth of research in aerodynamic loads to MW wind turbine.