Study On Structure And Aerodynamic Performance Optimization Of A Novel Disc-shaped Wind Turbine

With the development of distributed energy strategy,small-scale low-speed wind turbine has developed rapidly.The disc-shaped wind turbine has the advantages of low noise,high efficiency and self-starting.In this paper,the optimal design of the wind turbine is carried out.By means of numerical simulation and wind tunnel test,the influence of the main parameters such as chord length and camber of the wind turbine blade on the aerodynamic performance of the wind turbine is studied,and the optimized parameter range is obtained.It can provide basis for wind turbine impeller structure finalization.The specific work is as follows:In this paper,the structure of the impeller of the disc-shaped wind turbine is analyzed.Combined with the previous research results,the chord length and camber of the blade are determined as the main parameters for further optimization,and the range of the parameters is analyzed to determine the research conditions in this paper.According to the determined research conditions,the model is established and the three-dimensional steady-state numerical simulation calculation is carried out,and the aerodynamic performance of the wind turbine is studied through the analysis of flow field,torque,power and efficiency.First,through the comparison between the calculation results of various turbulence models and the wind tunnel experiment results,the calculation results of the standard k-ω model are more consistent with the actual test.All subsequent simulations use the standard k-ω model for calculation.The results show that the effect of blade chord length on the aerodynamic performance of wind turbines will first increase and decrease with the increase of blade chord length.Within the scope of the research,the impeller with a chord length of 20 mm is the model with the best aerodynamic performance.The maximum wind energy utilization factor is 0.364,which is about 1.25 times that of the 13.64 mm and 30.64 mm blade chord length models.Similar to the influence of blade chord length on the aerodynamic performance of wind turbines,the aerodynamic performance of wind turbines also increases and then decreases with the increase of blade camber.Under the change of seven levels from 0 ° to 180 °,the maximum wind energy utilization of the dish wind turbine increased from 0.212 corresponding to the 0 ° blade model to 0.364 corresponding to the 60 ° model,and then decreased to 0.168 corresponding to the 180 ° model.Three models were selected from two sets of models for 3D printing molding,and power coefficient were measured in a low-speed wind tunnel.The obtained results are compared with the results of numerical simulations,and the rule of the influence of blade chord length and camber on the aerodynamic performance of wind turbines in numerical simulation is well verified.