A study on the wind blade performance using blade element momentum theory

Oday Ibraheem Abdullah, Marrwa S. Ghanim, Muhsin J. Jweeg, Hakim S. Sultan Aljibori, Azher Mouhsen Abed

2023

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DOI 10.1063/5.0135950
Data confidence 70 medium
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Abstract

In this research paper, the aerodynamic performance of the blade of horizontal axis wind turbine has been investigated numerically based on the the Blade Element Momentum (BEM) method. The blade in this analysis is divided into several computational elements, where assumed no aerodynamic interaction between the elements. The primary objective is to analyze the blade performance under certain initial and boundary conditions. In addition to investigate the effect of geometrical parameters that include the radius of the blade tip, the blade twist, the lift-to-drag ratio and the induction factors as the primary dynamic parameters on the performance of the wind blade. It was determined the design parameters for a wind turbine that built using NACA4415 airfoil shape. It was found that the total thrust force, the total torque and the total power that would be generated by the selected wind turbine are 3739.5 N, 1827.0 N.m and 29.9 kW, respectively. The results also showed that reducing the number of blade elements results in an underestimation of the results based on aerodynamic predictions. Therefore, the number of blade elements needs to be adequately selected for reliable solution of BEM equations. It was found that the maximum value of the differential power along the radial position on the wind turbine span occurred at r/R=0.8. Furthermore, the maximum percentages of increment in the axial induction factor when change the radial position from the tip to the root of blade was 62%. While, for the tangential induction factor was decreased by 88% for the same change.