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<p>Available investigations on swept blade geometry based on an empirical exponential equation for sweep representation applicable to horizontal axis wind turbines (HAWTs) showed that the exponential model can improve power generation and reduce thrust. The aim of this work is to propose a new blade sweep model based on the combination of elementary flows (source and vortex flow singularities) and to compare the results with those due to the exponential model and the straight blade geometry. A modified computational blade element momentum method written in Matlab is applied to predict power and thrust variation with tip speed ratio (TSR), as well as torque and thrust with local radius, for 10&#xa0;kW straight and swept blade HAWTs. Also, different airfoils along the swept blades, different tip sweep angles and different blade sweep starting positions besides application of linear chord and twist distributions along the swept blades were investigated. For a TSR of 10, the power generation of the proposed swept blade HAWT was 13,869.82&#xa0;W, which is 12.8%&#xa0;higher than the power of the straight blade HAWT (12,293.58&#xa0;W), while the thrust of the proposed swept blade HAWT was 2243.86&#xa0;N, which is 33.3% lower than the thrust of the straight blade HAWT (3365.76&#xa0;N). The proposed sweep model is shown to increase the efficiency of HAWTs for high TSR and produce load alleviation which increases the useful life of wind turbines. The results can contribute to widen the design options of swept blade HAWTs.</p>

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Effects of Different Blade Sweep Models and Blade Geometries on the Performance of Horizontal Axis Wind Turbines

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Kamal Abdel Radi Ismail,
  • Pedro Antonio Assad Baracat

摘要

Available investigations on swept blade geometry based on an empirical exponential equation for sweep representation applicable to horizontal axis wind turbines (HAWTs) showed that the exponential model can improve power generation and reduce thrust. The aim of this work is to propose a new blade sweep model based on the combination of elementary flows (source and vortex flow singularities) and to compare the results with those due to the exponential model and the straight blade geometry. A modified computational blade element momentum method written in Matlab is applied to predict power and thrust variation with tip speed ratio (TSR), as well as torque and thrust with local radius, for 10 kW straight and swept blade HAWTs. Also, different airfoils along the swept blades, different tip sweep angles and different blade sweep starting positions besides application of linear chord and twist distributions along the swept blades were investigated. For a TSR of 10, the power generation of the proposed swept blade HAWT was 13,869.82 W, which is 12.8% higher than the power of the straight blade HAWT (12,293.58 W), while the thrust of the proposed swept blade HAWT was 2243.86 N, which is 33.3% lower than the thrust of the straight blade HAWT (3365.76 N). The proposed sweep model is shown to increase the efficiency of HAWTs for high TSR and produce load alleviation which increases the useful life of wind turbines. The results can contribute to widen the design options of swept blade HAWTs.