A shark fin bow structure and its bulbous bow hull shape

Abstract

The invention provides a shark fin bow structure, which includes an upper part and a lower part, the lower part is a bulbous nose; the front end of the upper part is perpendicular to the sea level, extends upwards to the bow surface of the hull, connects downwards to the bulbous nose, and connects to the bulbous nose backwards. Hull smooth connection. Because the structure of the present invention has the same narrow front end as the bow of the hull, it can change the flow of the water flow in the original bulbous depression, slow down the expansion of the streamline, and effectively reduce the wave-breaking resistance during the ship's navigation without affecting the bulbous bow. The reduction of wave-making resistance can solve the problem of increased resistance of the hypertrophy bulbous bow ship when sailing at medium and low speeds.

Description

technical field [0001] The invention relates to the field of ship design, in particular to a shark fin bow structure and its bulbous bow shape. Background technique [0002] The bulbous bow, also known as the "bulb bow", is the spherical protrusion below the water surface of the bow, which is a structure used to reduce the resistance of the ship. Its size and shape matched with the hull can counteract the pressure of the water, so that the generated boat waves are smaller, and it can improve the current situation near the hull to reduce the resistance of the boat. The spherical part is also called the bulbous nose. Different shapes have their own advantages and are suitable for different boat types. For example, the teardrop type is more suitable for passenger and cargo ships with higher speed, while the ram type bulbous nose is suitable for plump oil tankers, ore ships and bulk cargo ships. However, the structure of the bulbous bow also has certain problems. Due to the ...

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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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