Drag-reducing device of anti-rolling fin of ship wing flap

Abstract

The invention provides a drag-reducing device of a anti-rolling fin of a ship wing flap, comprising a fin and a wing flap, wherein one end of the fin is provided with a fin shaft; one end of the wing flap is provided with a wing flap fin shaft; the fin shaft and the wing flap fin shaft are connected with a ship hull; the upper fin surface at the free end of the fin is provided with an upper fin surface baffle, and the lower fin surface at the free end of the fin is provided with a lower fin surface baffle; the upper wing flap fin surface at the free end of the wing flap is provided with an upper wing flap fin surface baffle, and the lower wing flap fin surface at the free end of the wing flap is provided with a lower wing flap fin surface baffle. The invention has simple structure and easy installation and realization and can effectively reduce the induced resistance of a fin stabilizer, enhance the lift efficiency of the anti-rolling fin of the wing flap, prevent a water flow medium cavitation phenomenon from generation and enhance the anti-rolling effect of the anti-rolling fin of the wing flap and the safety and the economy of ship navigation.

Description

technical field [0001] The invention relates to a ship anti-rolling device, in particular to a flap-stabilizing fin drag-reducing device. Background technique [0002] Among the ship anti-rolling devices, the fin stabilizer is a kind of anti-rolling device that effectively provides lift. The fin stabilizer is an airfoil-type control airfoil. Due to the existence of the wingtip, when the ship is running, the upper and lower fin surfaces of the stabilizer fin have a certain pressure due to the difference in water flow velocity. If it is poor, the water flow will turn from the high pressure side to the low pressure side at the free end, and the water flow near the fin tip will be twisted due to backward flow and upward flow to form a wingtip vortex. The rotation of the wingtip vortex produces upwash and downwash water flow, which changes the lift force of the fin stabilizer and induces drag. The higher the speed of the vortex, the generated low pressure may reach the cavitati...

AI Technical Summary

Problems solved by technology

The higher the speed of the vortex, the generated low pressure may reach the cavitation of the liquid (that is, cavitation occurs), resulting in a decrease in the lift of the fin stabilizer, and it will cause erosion and noise on the fin surface, reducing the stabilization of the fin stabilizer effect, endangering the safety of the ship's navigation

[0003] In order to improve the anti-rolling effect of the fin stabilizer, the fin stabilizer is designed to have a flap structure. Due to the function of the flap, the lift of the flap stabilizer fin is greater than that of the ordinary fin stabilizer, but this type The structure fails to reduce the induced drag caused by the wingtip vortex. "Induced drag" is an important part of the drag on the ship's fin stabilizer and is the main factor affecting the performance of the fin stabilizer

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