Experimental Verification And Research Of Wind Turbine Blade Integrated Design Method

Energy is an important material base that can influence the quality of human life. The main energy that human use now are coal, oil, natural gas etc. But these energy reserves are limited, non-renewable, and the use of these energies will cause a series of environmental problems such as air pollution. In recent years, the renewable energy developed rapidly. Wind energy, as one of renewable green energies has swept the world, all countries in the world pay great attention to using wind energy as the breakthrough of energy shortages.Blade is one of the most important components of the wind turbine, its good design, reliable quality and superior performance are determinants that make sure the wind turbine can operate normally and stably. However, most of wind turbine blade airfoil and aerodynamic shape design in our country comes from Europe and the United States, we have not grasp its core technology. This greatly influences our country’s independent research and development level. Chen Jin, a professor of Chongqing University, has done the related research for many years. With the wind turbine airfoil and blade aerodynamics theory, groundbreaking introduce the conformal transformation theory, and combined with functional analysis method, he puts forward a series of wind turbine airfoil optimization design methods, and has designed a maximum relative thickness in 12%~40% airfoil series. During the process of designing of wind turbine. With the traditional wind turbine aerodynamics theory and the traditional blade aerodynamic elastic theory, establish a new computing model of wind turbine axial induction factor and circumferential inducing factor. This paper is the continuation of these works, to verify those design methods of the wind turbine blade, a rated power 1k W wind turbine blade has been designed and has done a power performance test. Then combines the results with another 1k W wind turbine. We get the following works and results.① Chose the optimized airfoil CQU-A150, Determine the chord and twist angle distribution of blade, then get the 3D model of blade. Introduce the airfoil CQU-A150. A MATLAB program which use the new computing model of wind turbine axial induction factor and circumferential inducing factor and wind energy utilization coefficient as the optimization objective has been developed. And we get the chord length and twist angle distribution, combined with the 2D CQU-A150 airfoil coordinates, through three dimensional coordinate transformation we get the 3D coordinates of each section of blade. Introduce these coordinates into the Solid Works software, after a series of curved surface operations, finally we get the 3D model of the blade.② Make static analysis of blade in finite element analysis software. Establish the finite element model of the blade, the blade is simplified as a hollow structure, according to the actual processing of leaves layer on the blade, SHELL99 shell element is used to model mesh, loads of the blade in the running process has been analyzed, determine the boundary conditions of the model, and analyze the results after loading.③ The production of the blade is finished. Summarize the development of blade material, introduce the characteristics of the FRP molding technology of machining, and the materials used during the processing of making blade. Describe the details of the blade manufacturing process, a group of blades are made, and the linked these blades with the exiting hub.④ A power performance test has been done. Read the GB/T 18451.0-2012/IEC 61400-12-1 standard carefully, determine the equipment according the standard and the actual situation. A test used on-board test method with the completed blades and blades of a domestic company has been done, process the testing data with bin method, then we get two power characteristic curves, from the results we get that the power generation of the new designed wind turbine is significantly higher than another wind turbine during 6m/s~9m/s wind speed. After calculation, annual energy production of the new designed wind turbine has improved 5%~6% than the domestic company’s wind turbine. The experimental results turn out that the design methods have been used are feasible, correct and advanced. It provides experimental basis for above blade design methods.