Shark fin bow structure and bulbous bow ship form thereof

Abstract

The invention provides a shark fin bow structure. The shark fin bow structure comprises an upper power and a lower portion, wherein the lower portion is a bulb, the front end of the upper portion is perpendicular to the seal level and extends upwards to the surface of a ship bow and is downwards connected to the bulb and backwards smoothly connected with a ship body. With a narrow front end similar to that of the ship bow, the shark fin bow structure can change the flowing conditions of waterflow in the recessed part of an original bulb, lower the streamline expansion degree and effectively reduce the wave breaking resistance during ship navigation without affecting the reducing effects of a bulbous bow on wave making resistance, thereby solving the problem of resistance increase of a large bulbous bow ship form during medium and low-speed navigation.

Description

technical field [0001] The invention relates to the field of ship design, in particular to a shark fin bow structure and a bulbous bow hull shape. Background technique [0002] The bulbous bow, also known as the "bulb bow", is the bulbous protruding part below the water surface of the bow, which is a structure used to reduce the resistance of the ship. Its size and shape can be matched with the hull to offset the water pressure, so that the generated ship waves are small, and the water flow near the hull can be improved to reduce the resistance of the ship. The spherical part is also called the ball nose, and its types include drop-shaped, angled-shaped, SV-shaped, pear-shaped, etc. Different shapes have their advantages and are suitable for different ship types. For example, the drop type is more suitable for passenger and cargo ships with high speed, while the bump type ball nose is suitable for plump oil tankers, ore carriers and bulk carriers. However, the structure o...

AI Technical Summary

Problems solved by technology

However, the structure of the bulbous bow also has certain problems.

Due to the addition of the bulbous bow structure, the contact area between the ship and water is increased, that is, the wet surface area of ​​the ship, and the viscous resistance of water to the ship is increased. Once the shape design is unreasonable, it may "increase resistance" to the ship , in addition, due to the existence of the bulbous bow, the flow field in the middle and upper part of the bow will change from uniform to chaotic, resulting in additional resistance increase caused by unfavorable factors such as vortices, so the structure of the bulbous bow still needs to be further improved. There is a lot of room for development

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