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- W4285284792 abstract "The application of tandem flapping foil propulsors to conventional aerial and underwater vehicles plays the most important role in the exploration of aerial and marine environments. The hydrodynamic study of fish schooling or birds’ flock when swimming/flying in fluid media and the application toward the development of tandem flapping wing robots is gaining more importance in the field of bioinspired vehicles. The advantages of tandem flapping wing configuration are improved thrust performance, maneuvering, and less energy input as the downstream foils consume less power compared to the single flapping foil. In this study, the thrust of two flapping foils arranged in the tandem mode subjected to pitching motion with different pitching amplitudes ( <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>A<sub>D</sub></i> ), Strouhal numbers ( <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>St<sub>D</sub></i> ), streamwise distance ( <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>S</i> / <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</i> ), and phase lag <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>$ ({rm{varphi) }}$</tex-math></inline-formula> of foils is studied numerically using the reynolds-averaged navier-stokes equation (RANSE)-based computational fluid dynamics solver. This novel study mainly investigates the effects of Strouhal number and the dimensionless pitching amplitude on the thrust and efficiency of tandem foils. It is observed that the tandem foils generate higher efficiency at <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>St<sub>D</sub></i> = 0.2. At this condition, the effects of streamwise distance and phase lag of tandem foils are also investigated. When <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>${rm{varphi }}$</tex-math></inline-formula> is constant and <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>S</i> / <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</i> changes from 0.109 to 1, the efficiency of the upstream foil decreases and the efficiency of downstream foil increases. When <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>S</i> / <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</i> is constant and <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>${rm{ varphi }}$</tex-math></inline-formula> changes from 0° to 180°, the efficiency of the upstream foil increases and the efficiency of the downstream foil decreases with an increase in phase lag. When <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>${rm{ varphi }}$</tex-math></inline-formula> is 90°, the total efficiency of the two foils gets the maximum value. In general, when <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>S</i> / <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</i> is 1 and <inline-formula xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink><tex-math notation=LaTeX>${rm{varphi }}$</tex-math></inline-formula> is 90°, the tandem flapping foils get the maximum propulsive efficiency. For achieving this condition, pitching amplitude, frequency, and increased phase lag between the two foils play a significant role compared to the streamwise distance ( <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>S</i> / <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>c</i> ) between the tandem foils." @default.
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- W4285284792 date "2022-07-01" @default.
- W4285284792 modified "2023-10-16" @default.
- W4285284792 title "Propulsive Performance and Optimum Configuration of Tandem Flapping Foils" @default.
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- W4285284792 doi "https://doi.org/10.1109/tia.2022.3174833" @default.
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