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Hydrodynamic Performance Computation of a Flapping Foil Based on Surface Panel Method

Author: LiNingYu
Tutor: SuYuMin
School: Harbin Engineering University
Course: Design and manufacture of ships and marine structures
Keywords: flapping foil efficiency hydrodynamic performance surface panel method
CLC: U674.941
Type: Master's thesis
Year: 2012
Downloads: 75
Quote: 0
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Abstract


Flapping foil propulsion is the use of biologically inspired hydrofoils to propel andmaneuver an underwater vehicle in a manner similar to fish or aquatic animals swimming.The main advantages flapping foils have over traditional propellers are increasedmaneuverability and efficiency. At present, most studies on the flapping foil are focused onhydrodynamic performance analysis and flow simulation, and the research objects are usuallyrectangular or trapezoidal foils, but the computation of efficiency of a three-dimensionalflapping foil performing a combined roll and pitch motion has not been enough accurate. Soaccording to the form of sea turtles’ flippers, a geometrical model of the flapping foil wasestablished. Based on the basic theory of theoretical mechanics and knowledge about motionof rigid body around a fixed point, a computation method of efficiency of thethree-dimensional flapping foil performing a combined roll and pitch motion was proposed. Acomputer program had been developed by use of surface panel method based on velocitypotential, and the mean thrust coefficient and efficiency of a rectangular foil and a trapezoidalfoil were calculated. The computation results showed good agreement with the experimentaldata of the trapezoidal foil and the computation results of numerical simulation of therectangular foil by Fluent, so the validation of the proposed method was proved. Based on this,the effects of some parameters on hydrodynamic coefficients and efficiency weresystematically analyzed, including distance from the center of roll to the foil root, phasedifference, pitch amplitude, incoming velocity, motion frequency and roll amplitude.

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CLC: > Transportation > Waterway transport > Marine Engineering > Various types of vessels > Ships: navigation state points > Dive boat
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