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<p>To boost the output power of flapping turbine, this investigation suggests a new kinematic for a Droop-Nose Leading-Edge (DNLE). The DNLE hangs down rapidly- twice faster the main airfoil- at the second quarter of the flapping cycle which increases drag force and therefore, the power extracted by horizontal motion <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40032_2025_1170_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="49" /> </InlineMediaObject> <EquationSource Format="TEX">\({P}_{x}\left(t\right).\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>P</mi> <mi>x</mi> </msub> <mfenced close=")" open="("> <mi>t</mi> </mfenced> <mo>.</mo> </mrow> </math></EquationSource> </InlineEquation> The DNLE hangs down only when the direction of main airfoil matches the direction of the drag force. The effect of DNLE length as well as its drooping angle were explored for a large rang of reduced frequency <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40032_2025_1170_Article_IEq2.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="20" /> </InlineMediaObject> <EquationSource Format="TEX">\({f}^{*}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow> <mi>f</mi> </mrow> <mrow /> <mrow> <mrow /> <mo>∗</mo> </mrow> </mmultiscripts> </math></EquationSource> </InlineEquation>. It was found that the DNLE increases the output power by 18% when the flapping foil executed a reversed D path and by 21.9% compared to vertical path.</p>

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New Kinematic of Droop-Nose Leading-Edge (DNLE) to Increase the Extracted Power by Flapping Wing

  • 期刊论文

  • 发表日期：

    2025年2月5日

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  • Lamamra Belkacem,
  • Ghilani Laala,
  • Bouzaher Mohamed Taher,
  • Alaeddine Zereg,
  • Bouchahm Nora,
  • Boukhari Djamel Eddine

摘要

To boost the output power of flapping turbine, this investigation suggests a new kinematic for a Droop-Nose Leading-Edge (DNLE). The DNLE hangs down rapidly- twice faster the main airfoil- at the second quarter of the flapping cycle which increases drag force and therefore, the power extracted by horizontal motion \({P}_{x}\left(t\right).\) P x t . The DNLE hangs down only when the direction of main airfoil matches the direction of the drag force. The effect of DNLE length as well as its drooping angle were explored for a large rang of reduced frequency \({f}^{*}\) f ∗ . It was found that the DNLE increases the output power by 18% when the flapping foil executed a reversed D path and by 21.9% compared to vertical path.