Experimental study on flow interaction between fore- and hindwings of dragnofly in hovering and forward flight

Hiroto Nagai, Koji Isogai, Tatsumi Fujimoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

There are various flow interactions between the fore- and hindwings of a dragonfly. However, the detailed mechanism of flow interaction between the fore- and hindwings has not been well understood. In this study, we clarify the aerodynamic mechanisms of flow interaction between fore- and hindwings of a dragonfly in hovering and forward flights. Measurements of unsteady aerodynamic forces acting on the tandem wings are conducted using a dynamically scaled mechanical model in a water tunnel. Moreover, flow visualization around the tandem wings is conducted using Particle Image Velocimetry. The effect of the phase difference between the fore- and hindwings on the aerodynamic characteristics is investigated in hovering and forward flights. The results indicate that the advanced hindwing ahead of the forewing, which is often used in steady flights of dragonflies, has a smaller variation with respect to the phase difference and a smaller difference between the fore- and hindwings in hovering and forward flight. In hovering flight, the flow interaction reduces the aerodynamic characteristics except at the phase difference of 0 deg. In forward flight, the advanced hindwing generates larger lift with a good efficiency than that without interaction.

Original languageEnglish
Title of host publication27th Congress of the International Council of the Aeronautical Sciences 2010, ICAS 2010
Pages998-1007
Number of pages10
Publication statusPublished - Dec 1 2010
Externally publishedYes
Event27th Congress of the International Council of the Aeronautical Sciences 2010, ICAS 2010 - Nice, France
Duration: Sep 19 2010Sep 24 2010

Publication series

Name27th Congress of the International Council of the Aeronautical Sciences 2010, ICAS 2010
Volume2

Other

Other27th Congress of the International Council of the Aeronautical Sciences 2010, ICAS 2010
CountryFrance
CityNice
Period9/19/109/24/10

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Materials Science(all)

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