Ball bow middle- and high-speed ship satisfying dragging navigation condition of icebreaker

Abstract

The invention relates to a ball bow middle- and high-speed ship, especially relates to a ball bow middle- and high-speed ship satisfying a dragging navigation condition of an icebreaker, and belongs to the technical field of a ball bow middle- and high-speed ship. The ball bow middle- and high-speed ship satisfying the dragging navigation condition of the icebreaker is characterized in that the X axis is in the length direction of a ship body, the Y axis is in the width direction, and the Z axis is in the vertical direction; the distance from the front end of a structural waterline to a ball bow end point is 2.5m, and the minimum distance between a ball bow while scantling draft and the tail part of an icebreaking dragging ship is 2m to 3.5m; 45%-65% of the length of the ball bow is disposed behind a bow vertical line, and the ball bow is guaranteed to have the sufficient effective length; transition between the upper part of the ball bow and the ship body is performed through a knuckle line, and an inclined angle between projection of the knuckle line in the X-axis direction and a line type of a cross section perpendicular to the X axis is 90 degrees to 150 degrees, so a transition line type is thin enough; and the front end point of a water line above the ball bow is in the shape of a sharp cutter point, the fact that a water surface is cut open is facilitated, and a wave breaking resisting force is reduced.

Description

technical field [0001] The invention relates to a bulbous bow medium-speed ship, in particular to a bulbous-bow medium-speed ship meeting the conditions for icebreaker towed navigation, and belongs to the technical field of bulbous-bow medium-speed ships. Background technique [0002] Ships sailing in the Baltic Sea need to be towed by icebreakers when they encounter severe ice conditions. Therefore, the bulbous bow of the towed ship must meet certain requirements before it can be towed by the authority's dedicated icebreaker. [0003] In order to ensure the safety of towing, the Finnish-Swedish ice class regulations and guidelines have made a detailed type description on the stern of the icebreaking towing vessel, and also stipulated the dimensions that the bow of the towed vessel must meet, such as figure 2 As shown, the maximum length from the end of the bulbous bow to the front of the waterline should not exceed 2.5m, and the gap between the bulbous bow and the stern of ...

AI Technical Summary

Problems solved by technology

[0004] However, generally for medium and high-speed ships, the bulbous bow will be designed to be relatively long, and the ratio of the length of the bulbous bow to the length between the bow and stern perpendiculars is generally greater than 3.0%. For a common ship with a length of 150m, the length of the bulbous bow will be greater than 4.5m, so the requirements for towed navigation limit the length and height of the bulbous bow

For ships with medium and high speeds (Froude number greater than 0.2

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