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http://dx.doi.org/10.5139/JKSAS.2005.33.7.009

Thrust Characteristics of Dual Flapping Airfoils in a Biplane Configuration  

Yu, Young-Bok (한양대학교 기계공학부)
Han, Cheol-Heui (한양대학교 기계공학부)
Cho, Jin-Soo (한양대학교 기계공학부)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.33, no.7, 2005 , pp. 9-17 More about this Journal
Abstract
The wake patterns and thrust characteristics of dual flapping airfoils in a biplane configuration are investigated using an unsteady panel method. To trace complicated wake shapes behind airfoils, a core addition scheme, a vortex core model, and the fourth order Runge-Kutta convection scheme are employed. Present results are verified by comparing them with flow visualization, exact solution and published computed results. The thickness and camber of thick airfoils has an effect of decreasing thrust. The airfoils produce maximum thrust when the phase angles between plunging and pitching motions are both 90 and 120 degrees. Thrust increases as the plunge velocity is increased, which is also found as the pitch amplitude is stepped up. Thrust decreases when the distance between the airfoils is less than 0.6c.
Keywords
Flapping Motion; Wake Rollup; Unsteady Panel Method;
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