Stern structure for internal rotation double-paddle ship

A stern and ship technology, which is applied in the field of stern structure design, can solve problems such as optimization difficulties and many appendages at the tail, and achieve the effects of improving propulsion efficiency, improving tail wake, and optimizing implementation.

Inactive Publication Date: 2016-07-06
SHANGHAI MERCHANT SHIP DESIGN & RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is: the stern structure of the existing internally rotating double-screw ship has a lot of room for improvement in terms of reducing resistance, improving efficiency, and improving the uniformity of wake flow. More bodies, more difficult to optimize

Method used

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  • Stern structure for internal rotation double-paddle ship
  • Stern structure for internal rotation double-paddle ship
  • Stern structure for internal rotation double-paddle ship

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] see Figure 1-Figure 4 , a stern structure of an internally rotating double propeller ship, comprising a pair of small tail fins of the internally rotating double propellers, which have a horizontal inclination to the central axis of the hull from front to rear, and the inclination direction of the small tail fins is in line with the direction of the stern flow field Correspondingly, the separation of the tail water flow is reduced, thereby reducing the drag.

[0032] see figure 1 , the rear end of the support shaft at the rear of the small skeg is connected to the hull through a single shaft bracket. The small tail fin is smoothly drawn out on the line of the main hull, the size of the rear end just wraps around the paddle shaft, and the shape of the front end takes into account the layout of the gearbox; the length of the small tail ...

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Abstract

The invention relates to a stern structure for an internal rotation double-paddle ship. The stern structure comprises a pair of small tail fins. In a vertical view, each small tail fin is arranged at a horizontal inclination angle from front to back towards the central axis of a hull, and a pair of supporting shafts in the small tail fins incline at the same angle. The small tail fins inclining inwards conform to the direction of a flow field of a stern, tail water flow separation is reduced, and therefore resistance is reduced. In addition, pre-rotational flow with the rotating direction opposite to that of paddles act on the paddles, so that the rear tail flow rotation of the paddles is weakened or eliminated, and the effects of tail flow energy loss reduction and propelling efficiency improvement are achieved. By the adoption of the stern structure, the tail flow field is effectively improved, the propeller exciting force is reduced, the propeller first-stage exciting force under designed draft is reduced to be below 1.5 kPa, and the ship comfort is improved; the structure is relatively simple, the structure and the size of a tail attaching body are not additionally arranged or changed, and optimization and implementation are better facilitated; and the economical efficiency and rapidness are better considered.

Description

technical field [0001] The invention relates to a stern structure of a ship, in particular to a stern structure of an internally rotating double-screw ship, and belongs to the technical field of stern structure design. Background technique [0002] Passenger ships (including ro-ro passenger ships and passenger and cargo ships) currently use sculls due to draft restrictions, maneuverability requirements, and international regulations for safe return to port. Propeller internal rotation is more efficient than external rotation, so if there is no special reason, the form of internal rotation is used. [0003] The line shape of the large tail fin corresponding to the double propellers will cause the vibration of the propellers to cause the hull to vibrate, so it is basically no longer used. Currently, the more popular tail types are no tail fin + dual-axis bracket or small tail fin + single-axis bracket. The structure of the former is relatively simple, and it is often used on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B1/08
CPCB63B1/08Y02T70/10
Inventor 张敏健孙家鹏魏菲菲
Owner SHANGHAI MERCHANT SHIP DESIGN & RES INST
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