Numerical Simulation Of Aerodynamic Performance Of Wind Turbine Wake Interaction And Array

Because of energy-deficiency in the international community, large-scale wind power plants are being built in nowadays. There are many problem in wind power plants such as covering too large area and mutual interference between each other. Therefore, how to fully and effectively use the energy resources and reduce land occupation must be concerned as the important topic for future study. Power loss of single turbine and even wind energy equipment utilization efficiency of wind power plant were caused by array in wind power plants and the wake interference between wind turbines. It is not only the oretically important, but has practical value to study the wake aerodynamic of the wind turbine. Blades, single wind turbine and double roter of different arrangements have been simulated using the Fluent 6.3.First,numerical simulation is conduced with software FLUENT. Pressure based, segregated, steady implicit are set in the solver. Turbulence model is SST k ?ω. Pressure-velocity coupling scheme is SIMPLEC. Discretization scheme is Second Order Upwind scheme. Power output and turbulent kinetic energy were compared with different numbers of rotating wind turbine and with single blade's and rotating blades. Computational results showed that the attaches vortex shedding from upper rotating blades was occurred during the operation,which lead to the change under lower blades environments and has great influence on total moment and power output.Secondldy, the numerical simulation is verified for its feasibility by comparing the aerodynamic performance of CFD model and wake model. The aerodynamic interaction between two rotors in both co-axial, arrangement in parallel and stagger arrangement and offset configurations has been simulated. Comparison of different location of both turbines simulation results were used for the analysis of wake interaction and velocity deficit in downstream wind direction. To reach the conclusion, the wake outlet is divergent shape. The wake of wind turbine is bias towards blade rotation downstream direction. Downstream turbine makes the upstream diverging wake to be convergence under co-axial wind conditions, and the output of downstream turbine is affected by upstream wake. Arrangement in parallel and stagger arrangement results in little power loss although their flow field were extruded by the wake effect of the reference turbine.Finally, comparison of different location of both turbines simulation results was used for the analysis of wake interaction and velocity deficit in downstream wind direction. The results showed that downstream turbine makes the upstream diverging wake to be convergence under co-axial wind conditions, and the output of downstream turbine is affected by upstream wake. As the wind direction change, down-stream turbines is removed from up-stream wind wake shadows, and the output power increases. The distance between the units should be proportional to the local prevailing winds range.