KR20140145242A - A rudder for a ship - Google Patents
A rudder for a ship Download PDFInfo
- Publication number
- KR20140145242A KR20140145242A KR20130067118A KR20130067118A KR20140145242A KR 20140145242 A KR20140145242 A KR 20140145242A KR 20130067118 A KR20130067118 A KR 20130067118A KR 20130067118 A KR20130067118 A KR 20130067118A KR 20140145242 A KR20140145242 A KR 20140145242A
- Authority
- KR
- South Korea
- Prior art keywords
- rudder
- bulb
- propeller
- rudder body
- twisted
- Prior art date
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/28—Other means for improving propeller efficiency
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H25/38—Rudders
- B63H25/382—Rudders movable otherwise than for steering purposes; Changing geometry
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H25/38—Rudders
- B63H2025/388—Rudders with varying angle of attack over the height of the rudder blade, e.g. twisted rudders
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The rudder bulb includes a rudder body rotatably installed at the rear of the propeller, and a rudder bulb installed at the rudder body, wherein the rudder bulb forms an elliptical bulb ellipsoid having a predetermined curvature at a tip thereof, And the rudder body has a twisted structure, thereby reducing the frictional resistance of the rudder bulb to the wake of the propeller and improving the propelling efficiency of the propeller, will be.
Description
BACKGROUND OF THE
In general, ships use rudders as means for adjusting the direction of travel.
Such a marine rudder comprises a rudder body rotatably mounted on the hull at the rear of the propeller and a rudder bulb installed in the rudder body.
When the rudder body rotates at a certain rudder angle and has a certain angle of attack in the flow of fluid, the vertical component of the lift acting on the rudder body is the tangent force Lt; / RTI >
In the prior art, cavitation occurs due to the characteristic of the wake of the propeller, that is, the resistance acting on the rudder due to the rotation of the propeller due to the rotation of the propeller, and the lift acting on the rudder is opposite to each other, The shape of the rudder has been improved due to the problem that the lateral force is lowered.
However, in the prior art, there is a problem that the wake of a propeller having an asymmetric flow velocity distribution can not be effectively rectified because the rudder body is formed in a symmetrical shape.
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a rudder structure which has a twisted rudder body and an elliptical rudder bulb facing the propeller, Rudder.
In order to attain the above object, the present invention provides a rudder body including a rudder body rotatably installed on a hull at the rear of a propeller, and a rudder bulb installed in the rudder body, wherein the rudder bulb has an elliptical bulb ellipsoid Wherein the rudder bulb has an asymmetrical shape from the maximum diameter to the distal end, and the rudder body has a twisted structure.
Further, in the present invention, it is preferable that the rudder body is more twisted in the vertical direction with respect to the center portion.
Further, in the present invention, it is preferable that the rudder body is twisted left and right by 5 degrees with respect to a vertical line.
As described above, the present invention improves the propulsion efficiency of the propeller by reducing the frictional resistance of the rudder bulb to the wake of the propeller by forming the rudder bulb structure into an elliptical shape and improving the rudder body to an asymmetrical shape .
1 is a side view of a ship including a rudder for a ship according to the present invention.
2 is a plan view of a marine rudder according to the present invention.
3 shows a cross-sectional view of a rudder bulb according to the present invention.
4 shows a front view of a rudder bulb and a rudder body according to the present invention.
5 is a side view of a rudder body according to the present invention.
6 is a front view of a rudder body according to the present invention.
Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
2 is a plan view of a rudder for a ship according to the present invention, FIG. 3 is a sectional view of a rudder bulb according to the present invention, and FIG. 4 is a plan view of a rudder according to the present invention. The front view of the rudder bulb and rudder body is shown.
1, the present invention relates to a ship rudder installed at the rear portion of a
When the
When the
A rudder body (20) is mounted on a rotatable rudder stock (21) to control the position of the rudder body (20).
The
The
Here, the portion of the
The
Therefore, the wake of the propeller can be smoothly flowed along the curved surface of the
On the other hand, the
It is preferable that the
On the other hand, the
The asymmetry of the
That is, the
Here, the right-side bulb angle?, Which is the slope of the starboard, is 0 to 15 degrees with respect to the first reference line P1, and the left-side bulb angle? ~ 30 °.
That is, the right-side bulb angle? Is smaller than the left-side bulb angle?.
The
As described above, the
Therefore, the wake velocity of the
Next, look at the rudder body structure.
FIG. 5 is a side view of the rudder body according to the present invention, and FIG. 6 is a front view of the rudder body according to the present invention.
As shown in Figs. 5 and 6, the
Referring to each cross section of the
However, the
The
5 and 6, the symbol? Indicates the right twist angle at which the rotor
The second
Accordingly, the
The present invention is not limited to the above-described embodiments, and many modifications may be made by those skilled in the art without departing from the scope of the present invention.
1: Ships
10: Propeller
11: rudder stock
12: Hub
20: rudder body
21: rudder stock
30: Rudder bulb
31: port side
32: starboard side
35: bulb ellipsoid
40: rudder body front end portion
41: rudder body center
42: rudder body twist right side
43: rudder body twist left side
50: rudder body rear end
61: first rudder body section
62: second rudder body section
63: third rudder body section
100: Vertical line
200: Horizon
A: First section of bulb
B: 2nd section of bulb
C: Third section of bulb
J1: Rudder bulb Contact point between starboard and rudder body
J2: Contact point of rudder bulb port and rudder body
P1: first reference line
P2: Second baseline
α: starboard bulb angle
β: Positive valve angle
γ: Right twist angle
δ: Left twist angle
Claims (3)
The rudder bulb forms an elliptical bulb ellipsoid having a predetermined curvature at its tip,
Wherein the rudder bulb is asymmetrical from the maximum diameter to the distal end,
Wherein the rudder body has a twisted structure.
Wherein the rudder body is further twisted in the vertical direction with respect to the center portion.
Wherein the rudder body is twisted left and right by 5 degrees with respect to a vertical line.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR20130067118A KR20140145242A (en) | 2013-06-12 | 2013-06-12 | A rudder for a ship |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR20130067118A KR20140145242A (en) | 2013-06-12 | 2013-06-12 | A rudder for a ship |
Publications (1)
Publication Number | Publication Date |
---|---|
KR20140145242A true KR20140145242A (en) | 2014-12-23 |
Family
ID=52675080
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR20130067118A KR20140145242A (en) | 2013-06-12 | 2013-06-12 | A rudder for a ship |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR20140145242A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101998285B1 (en) * | 2019-05-17 | 2019-07-09 | 이상욱 | Rudder for special ship |
CN111874178A (en) * | 2020-07-28 | 2020-11-03 | 江南造船(集团)有限责任公司 | Rudder bulb manufacturing method and rudder bulb |
-
2013
- 2013-06-12 KR KR20130067118A patent/KR20140145242A/en not_active Application Discontinuation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101998285B1 (en) * | 2019-05-17 | 2019-07-09 | 이상욱 | Rudder for special ship |
CN111874178A (en) * | 2020-07-28 | 2020-11-03 | 江南造船(集团)有限责任公司 | Rudder bulb manufacturing method and rudder bulb |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WITN | Withdrawal due to no request for examination |