A new type of ball head with multi-draft resistance performance

Abstract

The invention discloses a novel bulbous bow with multi-draught resistance and belongs to the field of ship design. The novel bulbous bow is applicable to ships with various navigational draught conditions; each ship has a ballast draught state and a designed draught state. A transverse profile of the bow is concave around a ballast draught height; between the ballast draught height and the designed draught height and close to the designed draught height, the transverse profile is convex. The novel bulbous bow according to the technical scheme has the advantages that ballast draught state resistance is evidently improved, the designed draught and structural draught resistances are kept unchanged substantially, comprehensive oil cost of the multi-condition operating ship is lowered, economy is improved, and emission is reduced.

Description

technical field [0001] The invention belongs to the field of ship design, and relates to a bow shape structure of a ship, in particular to a bow shape structure of a ship with various sailing draft working conditions. Background technique [0002] Due to the slowdown in global economic growth and the long-term downturn in the international shipping market, various shipping price indexes have continued to decline, and the profit margins of shipping companies have been greatly reduced. At the same time, in the face of the pressure of the EEDI (Energy Efficiency Design Index) rules of the International Maritime Organization, shipowners strongly hope to improve the comprehensive operational performance of new ships to reduce fuel consumption costs and meet the requirements of the new rules. [0003] Since transport ships generally sail in various draft states in actual operation, in order to obtain the best comprehensive performance, the hull shape design must take into account ...

AI Technical Summary

Problems solved by technology

[0003] Since transport ships generally sail in various draft states in actual operation, in order to obtain the best comprehensive performance, the hull shape design must take into account a variety of typical draft conditions at the same time, which is better than the traditional one that only focuses on the design draft. more complex design

In particular, many ship types use spherical bows in the bow in order to reduce navigational resistance, including the use of invisible spherical bows with no spherical bow shape in the side view profile but a spherical bow shape in the transverse section, which further increases the difficulty of optimal design of the molded line.

Because the general ball capital is optimized for a certain fixed draft state (such as design draft), it is difficult to take into account the resistance performance of other commonly used draft states at the same time, resulting in the resistance performance of the ballast draft being much worse than that of the design draft. The case where the load resistance is greater than the design draft and structural draft resistance

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