Aerodynamic Stability Research And Optimization Design Of Wnd Turbine Blade Based On Constrained Feasibility

Since non-renewable energy in the world,such as coal and oil etc., is gradually consumed, and the environment is furtherly deteriorated, people begin to focus their attention on the development and utilization of new clean energy, among which wind energy has the most richest storage. And it does not generate any pollution during the progress of application, which attracts many governments arround the world to doing what they can do to encourage and promote the development of wind industry. Wind turbine as the major form of wind-energy utilization, among which the most critical component to absorb wind energy is blade, whose aerodynamic shape can directly influence the structure, cost and efficiency of the whole turbine. But the study on high performance of blade still has much deficiency, therefore, it is necessary to do more research for the optimization of blade on aerodynamic shape. And then do some analysis and research on aerodynamic stability for blade.According to1.5MW wind turbine blade as the object of study, this paper, first of all, will take the optimization research of the aerodynamic parameters, do numerical simulation for the outer flow field of blade, and then study on prestressed aerodynamic stability based on fluid-solid coupling theory. The concrete research contents and conclusions of the paper are as follows:The blade before optimization:The aerodynamic theories of blade for wind turbine are researched. And the simplified design to obtain preliminary aerodynamic parameters of blade is deduced based on the momentum theory and blade element theory-Numerical simulation of aerodynamic performance:the theory and algorithm flow for aerodynamic performance of blade is derived. And then power coefficient for blade is obtained through numerical simulation for the comparison with follow-up study.Mathematical optimization model:considering the modified theory, such as hub loss, tip loss and cascade effect etc.,the optimization model for blade with nonlinear constraints is deduced based on the design theory of Wilson.Modified optimization algorithm:the flow of the improved genetic simulated annealing theory based on constrained feasibility is established. And then the algorithm is applied to the mathematical optimization model to obtain aerodynamic shape parameters. Finally, take numerical simulation for blade to compare the aerodynamic performance with that of blade before optimization.Research aerodynamic stability:based on the theory of spatial coordinate transformation, high-quality surface of the blade can be modeled by surface modeling in Pro/E. And then take numerical simulation of flow field in Fluent around the blade; obtain the modal results of the prestressed blade based on fluid-solid coupling theory. As is concluded, it shows that the optimized blade has excellent aerodynamic stability.