Please use this identifier to cite or link to this item: https://doi.org/10.1007/s10409-009-0259-1
Title: Analysis of non-symmetrical flapping airfoils
Authors: Tay, W.B.
Lim, K.B. 
Keywords: Airfoil
Design of experiments
Flapping
Non-symmetrical
Ornithopter
Issue Date: Aug-2009
Citation: Tay, W.B., Lim, K.B. (2009-08). Analysis of non-symmetrical flapping airfoils. Acta Mechanica Sinica/Lixue Xuebao 25 (4) : 433-450. ScholarBank@NUS Repository. https://doi.org/10.1007/s10409-009-0259-1
Abstract: Simulations have been done to assess the lift, thrust and propulsive efficiency of different types of non-symmetrical airfoils under different flapping configurations. The variables involved are reduced frequency, Strouhal number, pitch amplitude and phase angle. In order to analyze the variables more efficiently, the design of experiments using the response surface methodology is applied. Results show that both the variables and shape of the airfoil have a profound effect on the lift, thrust, and efficiency. By using non-symmetrical airfoils, average lift coefficient as high as 2.23 can be obtained. The average thrust coefficient and efficiency also reach high values of 2.53 and 0.61, respectively. The lift production is highly dependent on the airfoil's shape while thrust production is influenced more heavily by the variables. Efficiency falls somewhere in between. Two-factor interactions are found to exist among the variables. This shows that it is not sufficient to analyze each variable individually. Vorticity diagrams are analyzed to explain the results obtained. Overall, the S1020 airfoil is able to provide relatively good efficiency and at the same time generate high thrust and lift force. These results aid in the design of a better ornithopter's wing. © 2009 The Chinese Society of Theoretical and Applied Mechanics and Springer-Verlag GmbH.
Source Title: Acta Mechanica Sinica/Lixue Xuebao
URI: http://scholarbank.nus.edu.sg/handle/10635/59525
ISSN: 05677718
DOI: 10.1007/s10409-009-0259-1
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