Shilling rudder used for icebreaker

Abstract

The invention relates to a shilling rudder used for an icebreaker. The shilling rudder comprises a rudder heel (3) installed on a stem (1), an ice blade (2) and a rudder blade (7) located below the rudder heel (3). A rectification tail (12) of the rudder blade (7) is in a fishtail shape. An upper flow generating plate (9) and a lower flow generating plate (11) are installed at the upper end and the lower end of the rudder blade (7). The rotating angle of the shilling rudder ranges from -70 degrees to +70 degrees. A middle reinforcing rib (10) is installed in the middle of the rudder blade (7). The distance between the edges of the middle reinforcing rib (10) and the edges of the rudder blade (7) ranges from 100 mm to 150 mm. The ratio of the width of the rectification tail (12) to the chord length of the rudder is 0.07. The distance between the edges of the upper flow generating plate (9) and the edges of the rudder blade (7) and the distance between the edges of the lower flow generating plate (10) and the edges of the rudder blade (7) range from 150 mm to 200 mm. By means of the shilling rudder, the shipping direction stability and the rotation performance of a ship can be effectively improved; meanwhile, the ice block impacting resisting capacity of the rudder during ice navigation can be improved, a flow field at the tail can be improved, and the propelling performance of a propeller can be improved. Compared with a shilling rudder in the prior art, the shilling rudder has the advantages of being higher in rudder efficiency, better in strength and more suitable for working in frozen sea areas.

Description

technical field [0001] The invention relates to a fishtail rudder for an icebreaker, in particular to a fishtail rudder which can improve the heading stability and turning performance of the icebreaker, and also has the ability to prevent ice block collision. Background technique [0002] As a means of improving rudder efficiency, special measures such as changing the tail of the rudder to a movable flap and adding a rotary column to the leading edge are the most effective, but these measures are not suitable for icebreakers, because the flap rudder and the rotary column rudder are very effective in icebreaking. During sailing, the rear flaps and rotating columns are easily collided by ice floes, which greatly increases the chance of damage to the rudder and easily overloads the steering gear. [0003] The rudder effect of the conventional streamlined rudder is lower than that of the flap rudder and the rotary column rudder. Although it can avoid the anti-collision problem d...

AI Technical Summary

Problems solved by technology

[0002] As a means of improving rudder efficiency, special measures such as changing the tail of the rudder to a movable flap and adding a rotary column to the leading edge are the most effective, but these measures are not suitable for icebreakers, because the flap rudder and the rotary column rudder are very effective in icebreaking. During sailing, the rear flaps and rotating columns are easily collided by ice floes, which greatly increases the chance of damage to the rudder and easily overloads the steering gear

[0003] The rudder effect of the conventional streamlined rudder is lower than that of the flap rudder and the rotary column rudder. Although it can avoid the anti-collision problem during icebreaking navigation, it cannot meet the special requirements of some icebreakers for maneuverability and gyration.

[0004] Conventional fishtail rudders only have upper and lower deflectors, and most of them are square, which is not good for the tail flow field

Moreover, the conventional fishtail rudder is not equipped with a central stiffener plate, on the one hand, the lift of the rudder is limited, and on the other hand, the strength of the rudder cannot withstand the collision of ice blocks during ice-breaking navigation.

At present, the rotation angle of the conventional fishtail rudder is ±35°, which limits the turning performance and lateral movement ability of the ship

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