The Study Of The Interaction Between Vertialaxis Wind Turbine And Horizontal Axis Wind Turbine Of Integrated Axis Wind Turbine

In recent years,renewable energy has been receiving increasing attention from people.The domestic wind power industry has been developing rapidly.The capacity of wind turbines has increased continuously.The proportion of grid-connected wind farms in the power system is increasing,but wind energy is fluctuated and uncertain.In order to overcome the phenomenon of abandonment of wind energy and make full use of the near-ground resources at the bottom of the tower of horizontal axis wind turbine(HAWT)to increase the utilization of wind energy in limited wind farm resources,in this paper,through the combination between HAWT and vertical axis wind turbine(VAWT)is based on the tower of HAWT.An independent power generation system are added to the HAWT system to realize the transformation the structure of wind turbine.The models of 1.5 MW HAWT and independent design of 100 kW VAWT were built by using Solidworks software.The numerical simulations of a single HAWT and the integrated axis wind turbines(IAWTs)that VAWT and HAWT was in different spacing were performed adopting Fluent which is an effective computational fluid dynamics method.They were operated in inflow wind speeds of 7 m/s,10 m/s,13 m/s,and 16 m/s respectively.Then post-processing software was used to analyze the simulation results.In HAWT without adding VAWT,the velocity,pressure,and turbulent kinetic energy in the flow field were analyzed quantitatively and qualitatively.There was mutual interference between the tower and the blades in the wind turbine.There were turbulent vortexes in the downstream of the tower.Due to the rotation of the blades,a large number of spiral vortex cores were formed behind the plane of rotation.With the continuous operation of the turbine,the vortex change process can be roughly divided into three stages: formation,shedding,and mixing.The vortex changes periodically with rotation.As the measurement position was keeping away from the turbine,the speed of flow area was restored to the inflow speed,and the influence of wake of turbine was gradually reduced.As the wind speed increases,the pressure and turbulent energy increased significantly,the lift obtained by the blades increased,and the power generation capacity also increased.In IAWTs,changing the inflow wind speed and the spacing between different types of wind turbines would change the characteristics of wake flow filed and turbine performance.The utilization rate of wind energy in integrated wind turbines was 2%~3% higher than that of a single horizontal axis wind turbine.Vortex appeared below the tower,and the airflow of HAWTand VAWT will be mixed at downstream to form many large-scale vortices and small vortices.Flow fields became more complex,and turbulent kinetic energy fluctuated.Changing the distance between the two turbines in the IAWT could find that the smaller the distance was,the more obvious interaction between the units was.The distance had little effect on the power of the HAWT.When the inflow wind reached the rated velocity of turbine,the turbine power is almost stable.Adjusting the distance between the turbines was beneficial to improve the aerodynamic characteristics of the turbine and flow field.It was provided a reference for the design of turbine and the arrangement of the units in the wind farms.