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Tandem-wing interactions on aerodynamic performance inspired by dragonfly hovering.

Liansong Peng1, Mengzong Zheng1, Tianyu Pan2

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Dragonfly wing interactions significantly impact flight aerodynamics. Optimizing the phase difference between forewings and hindwings can enhance lift and efficiency during hovering.

Keywords:
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Area of Science:

  • Fluid dynamics
  • Biomechanics
  • Aerodynamics

Background:

  • Dragonflies utilize two pairs of wings (forewing and hindwing) for flight.
  • Interactions between these wings are crucial for dragonfly flight dynamics.
  • Understanding these interactions is key to comprehending insect flight.

Purpose of the Study:

  • To investigate the effects of tandem-wing (TW) interactions on dragonfly hovering aerodynamics.
  • To analyze how varying phase differences between wings influence aerodynamic performance.
  • To determine optimal wing configurations for enhanced lift and efficiency.

Main Methods:

  • Conducted numerical simulations comparing single-wing hovering to TW hovering.
  • Analyzed aerodynamic performance metrics including lift coefficient, power, and efficiency.
  • Studied TW hovering across a range of phase differences (γ).

Main Results:

  • TW interactions reduced forewing and hindwing lift coefficients by 7.36% and 20.25%, respectively.
  • Aerodynamic power and efficiency were decreased due to wing interactions, primarily vortex structure interplay.
  • A phase difference (γ) of 22.5° yielded maximum lift (over 20% of body weight) with high efficiency.
  • A phase difference (γ) of 180° generated lift equal to body weight.

Conclusions:

  • Tandem-wing interactions negatively impact baseline aerodynamic performance.
  • Wing phase difference is a critical factor in optimizing dragonfly hovering.
  • Specific phase differences, like 22.5°, enable significantly enhanced lift and efficiency, crucial for dragonfly maneuverability.