Simulation And Experimental Research On Aerodynamic Characteristics Of H-type Vertical Axis Wind Turbine With Internal Entity

The 13 th five year plan of China’s energy industry proposes to reduce the emission level of carbon dioxide and pollutants,clean the existing energy system,and focus on the development of renewable energy such as wind energy.However,due to the remote location of wind farms and the narrow power market,wind abandonment will occur,resulting in a great waste of energy.So the distributed wind power generation in the city has become a new development direction.Due to the large turbulence intensity and changeable wind direction of urban wind,it is not suitable for the application of large-scale horizontal axis wind turbines.Therefore,H-type vertical axis wind turbine(VAWT)which can use omnidirectional wind flow is selected to combine it with existing entities such as tower buildings,extending along its longitudinal direction to achieve large-scale wind power utilization,meet the energy consumption of buildings,and achieve the goal of zero carbon emission.In order to study and compare the aerodynamic characteristics of the H-type VAWT model under different conditions,the model is simplified into a twodimensional model,and the relative dimension relationship between the VAWT and the internal entity is represented by fixing the diameter of the rotor and changing the diameter of the internal entity.The model is simplified to a twodimensional model,and numerical simulation is carried out by CFD software.The wind power coefficient,flow field contour plot under different parameters and torque coefficient of single blade are compared and analyzed.Finally,the feasibility of the simulation method is verified by experimental research.The results show that:(1)With the increase of the diameter of the internal entity,the maximum wind power coefficient of the model decreases gradually,and the decline speed increases with the increase of the diameter of the internal entity.Moreover,at the low tip speed ratio,the wind power coefficient of the large diameter internal entity model is higher,which operations in a wider range of tip speed ratio.(2)At the same tip speed ratio,with the increase of the diameter of the internal entity,the range of influence on the wind turbine increases,which makes the performance of the wind turbine change.(3)At low tip speed ratio,the internal entity has a positive effect on the performance of the blade,which makes the torque coefficient of the single blade of the model increase,but with th e increase of tip speed ratio,the influence of the internal entity on the blade decreases.(4)The application of the model in tower building is analyzed.When the proportion of buildings is 57.7%,the utilization rate of space is the highest.(5)The error between the simulation results and the experimental results is small under the condition of small diameter of internal entity or low tip speed ratio,but there is a certain error under the condition of high tip speed ratio of large diameter of internal entity.(6)The experimental results are consistent with the simulation results,and the best tip speed ratio of the two is basically the same,which shows the feasibility of the simulation method,but there are still some differences.The above conclusion shows that the H-type VAWT with internal entity has its unique advantages.It has high efficiency and wide operation range while using omnidirectional wind,and the internal entity can improve the self starting performance of H-type VAWT,which has practical value.