CN109070981B

CN109070981B - Propulsion unit for multi-shaft ship

Info

Publication number: CN109070981B
Application number: CN201680085000.3A
Authority: CN
Inventors: 增田圣始; 藤泽竹春; 山内丰
Original assignee: Japan Marine United Corp
Current assignee: Japan Marine United Corp
Priority date: 2016-04-28
Filing date: 2016-04-28
Publication date: 2021-07-13
Anticipated expiration: 2036-04-28
Also published as: KR102199864B1; CN109070981A; EP3450299A1; WO2017187597A1; EP3450299B1; JP6770064B2; JPWO2017187597A1; EP3450299A4; KR20190003586A

Abstract

An attachment (8) for reducing hub vortex is disposed behind a propeller (side propeller) (4) without a rudder disposed behind, via a support body (7) extending from a hull (2). The attachment (8) has a circular cross section in a direction perpendicular to a central axis extending in the hull direction, and has a spindle-like shape with a diameter decreasing toward the rear end side at the rear portion thereof. The maximum diameter of the additive (8) is 10% to 40% of the diameter of the propeller (side propeller) (4), and the length in the hull direction is 40% to 70% of the diameter of the propeller (side propeller) (4).

Description

Propulsion unit for multi-shaft ship

Technical Field

The invention relates to a propulsion device for a multi-axis ship.

Background

As a propulsion device for a ship using a propeller, it has been known that a rudder device provided behind the propeller is provided with an additional object in order to reduce a hub vortex generated by rotation of the propeller and thereby improve propulsion efficiency. For example, patent document 1 listed below describes a propulsion performance improvement device for a ship, which includes a bulb and a pair of left and right fins at positions on a propeller axis line of a front edge of a rudder disposed rearward of a propeller. Patent document 2 discloses a twin-shaft twin-rudder twin-skeg ship having a bulb and fins provided in the rudder behind each propeller on the port and starboard sides.

Patent document 1, Japanese patent application laid-open No. 11-139395.

Patent document 2, Japanese patent laid-open No. 2015-166218.

However, if such attachments such as the bulb and the fin are provided with a rudder immediately behind the propeller, the attachments can be arranged behind the propeller by being attached to the rudder. That is, in the case of a single-shaft ship, a rudder is provided only behind one of the propellers provided, but in the case of a three-shaft ship, for example, if sufficient maneuverability is obtained only by a rudder disposed behind the center propeller, the rudder may be provided only on one of the center propellers, and there are many cases where the rudder is not provided behind the side propellers. In addition, even in a twin-screw ship, for example, two propellers are provided on the right and left of a stern, and only one rudder is arranged behind the center (twin-screw ship), in this case, the rudder is not arranged right behind the propellers. The same is true for vessels with more than four axes. That is, in a multi-axis ship having two or more axes, there are some propellers which do not have a rudder at the rear, and in such propellers, since there is no appropriate structure at the rear, it is not possible to provide the bulb or the fin as described above. Thus, depending on the type of multi-axis ship, there is a propeller in which hub vortex cannot be reduced by an additional object, which becomes a factor that hinders improvement of propulsion efficiency.

Disclosure of Invention

In view of the above circumstances, the present invention is intended to provide a propulsion device for a multi-axis ship, which can improve the efficiency of propulsion of a propeller of the multi-axis ship.

The present invention relates to a propulsion device for a multi-axis ship, wherein an attachment for reducing hub vortex is disposed behind a propeller without a rudder disposed behind the propeller, via a support body extending from a hull.

In the propulsion device for a multi-axis ship according to the present invention, it is preferable that the attachment has a circular cross section in a direction perpendicular to a central axis extending in the ship body direction, and has a spindle shape with a diameter decreasing toward the rear end side at the rear portion thereof.

In the propulsion device for a multi-axis ship according to the present invention, it is preferable that the maximum diameter of the additive is 10% to 40% with respect to the diameter of the propeller, and the length in the hull direction is 40% to 70% with respect to the diameter of the propeller.

The propulsion device of the multi-axis vessel of the invention can be applied in relation to the side propellers of a tri-axis vessel.

According to the propulsion device for a multi-axis ship of the present invention, an excellent effect of improving the propulsion efficiency of the propeller of the multi-axis ship is obtained.

Drawings

Fig. 1 is a view schematically showing an example of the overall structure of a multi-axis ship to which the present invention is applied.

Fig. 2 is a diagram showing an example of a mode of a propulsion device of a multi-axis ship according to an embodiment of the present invention, and is an enlarged view of a main part of fig. 1.

Fig. 3 is a diagram showing another example of the mode of the propulsion device of the multi-axis ship according to the embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 to 3 show an example of a propulsion device for a multi-axis ship according to an embodiment of the present invention. In the present embodiment, the case of applying the present invention to a three-axis ship is exemplified, and as shown in fig. 1, a multi-axis ship (three-axis ship) 1 includes one propeller (center propeller) 3 provided at the center of the stern of a ship body 2, and three propellers (side propellers) 4 provided on the left and right, respectively.

As shown in fig. 2, a rudder 5 is disposed behind the center propeller 3, and a bulbous (バルブ) -shaped attachment 6 is provided at the rudder 5 at the axial height of the center propeller 3. The attachment 6 is, for example, a body having a circular cross section in a direction perpendicular to a central axis extending in the hull direction and a spindle-like shape having a diameter that decreases toward the rear end side at the rear end thereof, and is provided so as to extend from the front edge of the rudder 5 toward the center propeller 3. By means of the addendum 6, the hub vortex generated along with the rotation of the center propeller 3 is suppressed at the center propeller 3.

In the triaxial vessel 1 of the present embodiment, the rudder is not disposed behind the side propeller 4, and instead the support body 7 is provided, whereby the attachment 8 is disposed behind the side propeller 4.

The support 7 is a plate-like member extending from the bottom of the hull 2 to the rear of the side propeller 4. The support body 7 is formed to form a vertical plane in the hull direction so as not to increase the hull resistance as much as possible, and has a streamlined shape in cross section along the horizontal plane. An attachment 8 is supported at the lower end of the support body 7 at the axial height of the side propeller 4.

The attachment 8 is a body having a circular cross section in a direction perpendicular to a central axis extending in the hull direction, and is configured in a spindle shape having a diameter that decreases toward the rear end side as the attachment 6 is used. The position of the center shaft is set to coincide with the axis of the side propeller 4. In the present embodiment, the hub vortex generated behind the side propeller 4 is suppressed by the attachment 8.

In order to effectively reduce the hub vortex of the side propeller 4, the diameter of the supplement 8 is preferably 10% to 40%, more preferably 20% to 30%, with respect to the diameter of the side propeller 4 at the maximum portion near the leading end. The length of the supplement 8 in the hull direction is preferably 40% to 70%, more preferably 50% to 60%, with respect to the diameter of the side propeller 4.

As shown in fig. 1 and 2, the basin test by the applicant of the present application revealed that if the bulbous attachment 6 is disposed on the rudder 5 behind the center propeller 3 and the attachment 8 having a diameter of about 25% of the diameter of the side propeller 4 and a length of about 56% of the diameter of the side propeller 4 is disposed behind the left and right side propellers 4, the total horsepower of the three-axis ship 1, which is the sum of the horsepower of the center propeller 3 and the horsepower of the two side propellers 4, is reduced by about 6% as compared with the case where the attachments 6, 8 are not provided. In addition, the rudder 5 behind the center propeller 3 may be provided with no additional member, and the additional member 8 may be disposed only behind the side propellers 4, so that the reduction rate of the horsepower of the entire triaxial vessel 1 is about 4%.

In addition, the support body 7 may be provided with a fin-shaped attachment 9 protruding to the left and right as shown in fig. 3, for example, in addition to the attachment 8 having the shape as described above, and may be provided with an attachment 9 as shown in fig. 3 in addition to the attachment 8 as shown in fig. 2. In addition, any shape of attachment may be disposed on the support body 7 as long as the hub vortex can be reduced at the rear of the side propeller 4.

In the present embodiment, by providing the support body 7 behind the side propeller 4, the attachment 8 can be disposed behind the side propeller 4 having no rudder behind the side propeller, and the hub vortex accompanying the rotation of the side propeller 4 can be effectively reduced.

As described above, in the present embodiment, the addendum 8 and the addendum 9 for reducing the hub vortex are disposed behind the propeller (side propeller) 4 having no rudder disposed behind, via the support body 7 extending from the hull 2, so that the hub vortex can be reduced also in the propeller (side propeller) 4 having no rudder disposed behind.

In the present embodiment, the attachment 8 can be configured to have a circular cross section in a direction perpendicular to the central axis extending in the hull direction and a spindle-like shape having a diameter that decreases toward the rear end side at the rear portion thereof, and thus the hub vortex generated in the propeller (side propeller) 4 can be more effectively reduced.

In the present embodiment, the maximum diameter of the attachment 8 can be set to 10% to 40% with respect to the diameter of the propeller (side propeller) 4, and the length in the hull direction can be set to 40% to 70% with respect to the diameter of the propeller (side propeller) 4.

Therefore, according to the present embodiment described above, the propulsive efficiency of the propeller of the multi-axis ship can be improved.

The propulsion device for a multi-axis ship according to the present invention is not limited to the above-described embodiment, and it is apparent that various modifications can be made without departing from the scope of the present invention.

Description of the reference numerals

1 Multi-axis boat (three-axis boat)

2 hull of ship

4 airscrew (side propeller)

7 support body

8 addition of

9 addition of a substance.

Claims

1. A propulsion device for a multi-axis ship, characterized in that,

the side propeller applied to the triaxial vessel is provided with an additional object for reducing hub vortex through a support body extending downwards from the bottom of the hull at the rear of the propeller without a rudder arranged at the rear,

the additive has a circular cross section in a direction perpendicular to a central axis extending in the hull direction, and has a spindle-like shape with a diameter decreasing toward the rear end side at the rear portion thereof,

the addition is a flat shape with the front end along the surface orthogonal to the central axis,

the additional object is arranged apart from the propeller in a way that the front end of the additional object is positioned at the rear part of the rear end of the propeller,

does not have a fin-shaped protrusion extending laterally or downwardly from the attachment.

2. Propulsion unit for a multi-axis ship, according to claim 1,

the maximum diameter of the additive is 10% to 40% of the diameter of the propeller, and the length of the additive in the ship body direction is 40% to 70% of the diameter of the propeller.