Research of Geometric Features Effect on the Wind Turbine Airfoil Roughness Sensitivity

doi:10.3901/JME.2018.14.198

Abstract

Abstract: Based on the method of orthogonal test, researches the influence that the maximum relative thickness, the maxim relative camber and trailing edge thickness of airfoil exert upon the airfoil leading edge roughness sensitivity, to evaluate the airfoil roughness sensitivity index, and discusses the effect that increasing surface plane node on different regions of airfoil surface exerts upon the calculation results of the XFOIL software. The results show that inserting the surface node on the negative normal pressure gradient region of upper surface has a significant effect on the calculation results, and on the other rest of region of airfoil, the speed of convergence will increase, but no obvious effect on the calculation results. Through range and variance analysis, it was found that the roughness in the leading edge of airfoil will result in the deterioration of aerodynamic performance, and the maximum relative thickness in airfoil will have a significant impact on all the indictors of the sensitivity of airfoil, but the maximum relative camber and the trailing edge thickness only on some indicators among them. Meanwhile the increase of trailing edge thickness will positively exert upon cutting down the decrease of the lift coefficient and lift-drag ratio caused by the leading edge roughness of airfoil.

Key words: orthogonal test, roughness sensitivity, significant influence, wind turbine airfoil, XFOIL software

CLC Number:

TK83

LIU Hongpeng, YAN Rujing, WANG Yuzhong, WANG Qing. Research of Geometric Features Effect on the Wind Turbine Airfoil Roughness Sensitivity[J]. Journal of Mechanical Engineering, 2018, 54(14): 198-206.

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