Effects of Surface Roughness on Aerodynamic Performance of a Wind Turbine Airfoil

Abstract

The two-dimensional incompressible Navier-Stokes equations and the SST k-ω turbulence model are used to investigate the aerodynamic performance of a wind turbine airfoil under clean and rough surface conditions.The DU 95-W-180 airfoil is analysized, which is widely used in wind turbines.The numerical simulation of the airfoil under clean surface condition is performed,and the numerical results have a good consistency with the experimental data.The studies in the effects of surface roughness on performance of the airfoil are mainly as follows:computation of the lift coefficient and the drag coefficient of the airfoil under different roughness heights on full surface and different roughness locations;the trends of the lift coefficient and the drag coefficient changing with the roughness heights and roughness locations;the critical value of roughness height and roughness location;the trends of the lift coefficient and the drag coefficient changing with the roughness heights at the critical locations.Furthermore, the unsteady flow field analysis of vortex shedding induced by the surface roughness is performed.

On the role of surface roughness in the aerodynamic performance and energy conversion of horizontal wind turbine blades: a review

“…However, Salem et al [17] validated the numerical results obtained by Nianxin [15] and compared it with Khalfallah and Koliubb [18]. Nianxin [15] and Deshun et al [16] concluded that the surface roughness causes turbulence and flow separation. Nianxin [15] and Deshun et al [16] concluded that the surface roughness causes turbulence and flow separation.…”

“…Nianxin [11] used NACA 63-430 airfoil design in a dusty environment which contains hot dry sand particles. As for Deshun et al [16], they used a DU 95-W-180 airfoil design, but, Salem et al [17] used NACA 63-215. The simulation model was validated by Nianxin [15] and Deshun et al [16] using the wind tunnel experimental data under a clean environment conditions.…”

“…As for Deshun et al [16], they used a DU 95-W-180 airfoil design, but, Salem et al [17] used NACA 63-215. The simulation model was validated by Nianxin [15] and Deshun et al [16] using the wind tunnel experimental data under a clean environment conditions. However, Salem et al [17] validated the numerical results obtained by Nianxin [15] and compared it with Khalfallah and Koliubb [18].…”

“…Nianxin [15] and Deshun et al [16] concluded that the surface roughness causes turbulence and flow separation. Figure 4 shows the variation of the drag and lift coefficients with roughness height for both, Nianxin [15] and Deshun et al [16] studies. The critical roughness length of Nianxin [15] and Deshun et al [16] airfoils is 0.3 mm and 0.5 mm.…”

Aerodynamic Effects of Roughness on Wind Turbine Blade Sections

“…Furthermore, manufacturing roughness parameters such as the arithmetic average of the roughness, , or the average 'ruggedness' of the surface, have been used to correlate some statistical measure of the roughness to changes in the wind turbine aerodynamics. Such studies as Shen (2011) andLi (2010) investigated geometric similarities as scaling methods but have shown only marginal success. In the case of Li (2010) single roughness elements were considered and their total height used as a scaling parameter for wind turbines.…”