Abstract
In order to improve the hydrodynamic performance of hydrofoils, this paper shows excellent hydrodynamic performance according to the flapping motion of fish through the tail fin. The Naca66 hydrofoil is used as the original hydrofoil and the trailing edge flap configuration is added. Ansys-fluent is used to analyze the relationship between the structural parameters (length and angle) of the flap and the hydrodynamic performance of the hydrofoil, the reliability of CFD numerical simulation is verified by PIV experiment. It is found that the hydrofoil, with clockwise rotating short flap, can significantly improve the hydrodynamic performance of a hydrofoil at a small angle of attack; at a high angle of attack, the hydrofoil with counterclockwise flap can increase the critical stall angle and slightly improve the hydrodynamic performance of the hydrofoil. The hydrodynamic performance of hydrofoil with rotatable short flaps reported in this paper can provide valuable information for the design and optimization of this kind of hydrofoil.
Highlights
Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
This mainly analyzes the influence of flap on hydrofoil according the and lower trailing edges, the analyzed decreaseinofdetail, lift coefficient, and to upper hydrodynamic performance, so theresulting flow field in is not as can reduces the pressure difference between the leading and trailing edges of hydrofoil, be seen in Figure 6a, the lift coefficient of the hydrofoil increases with the increase of thereangle of decreases increases again, this shows that stall and deep stall sulting inattack, the decrease of the and dragthen coefficient
Ansys-fluent numerical calculation software is used to analyze the influence of flap on the hydrodynamic performance of naca66 hydrofoil
Summary
A NACA66 hydrofoil was used in the present research. The hydrofoil has a relative. Flap modification of naca hydrofoil maximum camber of 2% at 50% from the leading edge. Whenever the flap angle flap performance under different Reynolds numbers are analyzed by CFD. Whenever theor flap length changed, it changed, needs to be re-modeled and meshed. The total chord length of the angle or is flap length is it needs to be re-modeled and meshed. A < 0) to obtain hydrofoils with different angle flaps. The rotation: FA > 0, counterclockwise rotation: FA < 0) to obtain hydrofoils with different reliability of CFD simulation is verified by PIV experiment and ICEM-CFD is used to mesh angle flaps. ·mis Inlet static pressure;0.5ρV∞2 is dynamic where lFluid is liftdensity force; d is drag force; inlet (mm)
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