Three-dimensional flow simulation for horizontal axis wind turbine

Through three-dimensional flow field calculation for a typical horizontal axis wind turbine, with reference to wind tunnel test data, this article obtains factors that impact accuracy of three-dimensional flow field calculation. These factors include: selection of computational domain and structured grid on the blade surface. With guaranteed calculation accuracy, analysis about three-dimensional flow field was conducted, and the results show that the torsion blade design can reduce attack angle; attack angle increase with velocity of wind flow increasing; great flow speed caused flow separation; horizontal axis wind turbine will work in a state of negative angle of attack with great blade top speed ratio and flow separation reduce the load of the blade surface thus reduce the output power, but the flow separation in the strong velocity of wind flow can prevent blade to damage.