Effect of fore-wing motion on increasing the performance of a tandem flapping wing power generator


Fenercioğlu Aydın İ. , Karakaş F.

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, vol.34, no.4, pp.1897-1915, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 34 Issue: 4
  • Publication Date: 2019
  • Doi Number: 10.17341/gazimmfd.571624
  • Title of Journal : JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
  • Page Numbers: pp.1897-1915

Abstract

Low Reynolds number flow regime attract interest to provide insight to alternative energy production studies. Understanding how natural fliers utilize and control the unsteady aerodynamic phenomena to enhance their capabilities draw continuous attention on improving the design and development of engineered systems that may take advantage of similar unsteady aerodynamic mechanisms. For a better improvement to the design of a renewable and sustainable tandem flapping-wing energy generator, this experimental study investigates the flow structures around and in the near wake of the flapping foils to put forward the effect of rapid pitch reversal time (Delta TR) and the phase angle (psi) on the system's energy efficiency by commenting on productive or destructive power production. When the fore wing and the hind wing motions are equal, the maximum power can be attained with sinusoidal motion (Delta TR = 0.5) and psi = 135 degrees phase angle. When the fore wing performs sinusoidal motion, the pitch reversal time Delta TR-hind = 0.4 case can produce power in addition to the power produced by the fore wing when the phase angle is between 45 degrees <= psi <= 180 degrees. It can be concluded that using a sinusoidal fore wing to slow down the flow seen by the hind wing less, can result in more effective energy production in a tandem flapping wing system.