Experimental study on the effect of blade surface roughness on aerodynamic performance

In order to study the effect of surface roughness of wind turbine blade on aerodynamic performance, the three novel roughness models are proposed, and the corresponding simulation model is also established. Simulation analysis and wind tunnel test are carried out respectively, and the results show that they are consistent with each other. The 5mm-spacing double rectangular roughness strips lead to 64.9% reduction of the maximum lift/drag, the single rectangular roughness strip pasted on 10% chord-length can reduce the maximum lift/drag by 30.8%, both two rectangular strip models can cause early stall, while the effect of arc strip is minimal among three roughness models.