KR101911100B1 - Propulsion improving apparatus of ship - Google Patents
Propulsion improving apparatus of ship Download PDFInfo
- Publication number
- KR101911100B1 KR101911100B1 KR1020130088845A KR20130088845A KR101911100B1 KR 101911100 B1 KR101911100 B1 KR 101911100B1 KR 1020130088845 A KR1020130088845 A KR 1020130088845A KR 20130088845 A KR20130088845 A KR 20130088845A KR 101911100 B1 KR101911100 B1 KR 101911100B1
- Authority
- KR
- South Korea
- Prior art keywords
- duct
- ship
- propeller
- flow path
- propulsion
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
- B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
- B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
A ship propulsion improvement apparatus having a lightweight structure according to an embodiment of the present invention includes an asymmetrical duct installed in front of a ship propeller to guide a flow of fluid, And has a tapered structure with a narrow width.
Description
[0001] The present invention relates to a ship propulsion improvement apparatus, and more particularly, to a ship propulsion improvement apparatus having a lightweight structure capable of improving a propulsion performance of a ship through a duct having a structure in which the upper chord is narrowed, .
In general, a duct is installed at the stern of the hull to improve propulsion of the ship. The duct has a columnar shape with a hollow portion in the longitudinal direction and has an airfoil cross section having a predetermined angle of attack with respect to the flow from the front toward the duct.
Conventional ducts are formed to have, for example, an airfoil cross section having the same shape in the circumferential direction when formed in a cylindrical shape. In this case, the duct generally has an airfoil section whose pressure surface faces outward and whose suction surface faces inward.
In the case of a duct having such a shape, thrust is generated in the upper region of the duct by the flow introduced into the duct.
However, in the lower region of the duct, excessive detent causes flow separation, resulting in a lower area of the duct as a resistance. This resistance reduces the propulsion efficiency of the ship by damping the thrust generated in the upper region of the duct.
A prior art related to the present invention is Korean Patent Laid-Open Publication No. 10-2012-0065029 (published on June 20, 2012), which discloses a 'circular duct support structure for a ship'.
The present invention provides a ship propulsion improvement apparatus having a lightweight structure capable of improving the propulsion performance of a ship through a duct having a structure in which the upper chord is narrowed asymmetrically.
A ship propulsion improvement apparatus having a lightweight structure according to an embodiment of the present invention includes an asymmetric duct installed in front of a ship propeller to guide a flow of a fluid, And has a tapered structure with a narrow cross section.
The duct includes a first flow path portion having an annular body and provided at a port or a starboard port through the hollow of the duct, a second flow path portion provided on the opposite side of the first flow path portion, 2 < / RTI >
The width of the upper surface of the duct has a ratio of 0.3 to 0.5 with respect to the width of the lower surface of the duct.
The inside of the duct has a twisted cross-sectional structure.
The duct is spaced upward from the central axis of the propeller.
According to the present invention, the ship propulsion improvement apparatus having a lightweight structure can affect the flow of fluid flowing into a propeller through a duct having a left-right asymmetric structure, thereby improving the propulsion performance of the ship.
Further, the present invention has a structure in which the upper chord of the duct is narrowed, and the propulsion performance of the ship can be improved by reducing the thrust reduction part.
FIG. 1 and FIG. 2 are views showing a simplified flow direction of a ship operated using a conventional ship propulsion device and a fluid flowing through the ship.
3 is a side view schematically showing a ship equipped with a ship propulsion improvement apparatus having a lightweight structure according to an embodiment of the present invention;
FIG. 4 is a side view showing a simplified enlarged view of a ship propulsion improvement apparatus having a lightweight structure according to an embodiment of the present invention. FIG.
5 is a front view schematically showing a ship propulsion improvement apparatus having a lightweight structure according to an embodiment of the present invention.
FIG. 6 is a schematic view showing a ship operating with a ship propulsion improvement apparatus having a lightweight structure according to an embodiment of the present invention; FIG.
BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: It is intended that the invention be described in its entirety by reference to the appended claims and their equivalents.
In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
FIG. 1 and FIG. 2 are schematic views showing a flow direction of a ship and a fluid flowing through the ship using a conventional ship propulsion device.
Referring to FIGS. 1 and 2 together, a
When the
At this time, as shown in FIG. 2, the fluid introduced into the rotating propeller does not flow in the linear direction by the propeller but flows in the direction of the twisted curve, so that the propulsion force of the
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, a ship propulsion improvement apparatus having a lightweight structure according to an embodiment of the present invention will be described with reference to the accompanying drawings.
3 and 4 are side views schematically showing a ship equipped with a ship propulsion improvement apparatus having a lightweight structure according to an embodiment of the present invention.
3 and 4, a ship
The
At this time, the front of the
As shown in FIG. 4, the
At this time, the
This is because, when the
The width d1 of the upper surface of the
That is, assuming that the width d2 of the lower surface of the
If the ratio of the width d1 of the upper surface of the
On the contrary, when the ratio of the width d1 of the upper surface of the
The width d1 of the upper surface of the
5 is a front view schematically showing a ship propulsion improvement apparatus having a lightweight structure according to an embodiment of the present invention.
Referring to FIG. 5, the
The
The first
The second
That is, as shown in the drawing, the first
At this time, the alpha angle is 90 ㅀ, and the β angle can be an acute angle. The flow area angles? And? Of the first and
The inside of the
Accordingly, the internal structure of the
FIG. 6 is a schematic view illustrating a ship operated using a ship propulsion improvement apparatus having a lightweight structure according to an embodiment of the present invention.
Referring to FIG. 6, it can be seen that the
At this time, the ship
As shown in the figure, when the
At this time, the
In this way, the fluid introduced into the
As described above, the ship propulsion improvement apparatus having the lightweight structure of the present invention can improve the propulsion performance of the ship by influencing the flow of the fluid flowing into the propeller through the duct having the asymmetric structure.
Further, the present invention has a structure in which the upper chord of the duct is narrowed, and the propulsion performance of the ship can be improved by reducing the thrust reduction part.
As described above, a ship propulsion improvement apparatus having a lightweight structure according to an embodiment of the present invention has been described.
It is to be understood that the terminology or words used in the foregoing detailed description and in the following claims should not be construed as limited to ordinary or dictionary meanings and the inventor shall not be construed to limit the concept of the term to the best of his / Should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be properly defined.
It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, It should be understood that water and variations may be present.
1: Ships
100: Ship propulsion improvement device
101: Propeller
102: Propeller center axis
110: duct
111: Duct center axis
112:
113:
Claims (5)
The front of the duct has a tapered structure with a narrower section from the lower part to the upper part,
In the duct,
And the arc portion is fixed to the hull by the port supporting portion and the star supporting portion,
Wherein the port support portion or the starboard support portion has a lightweight structure having a torsional sectional structure.
In the duct,
Having an annular body,
A first flow path portion provided at a port or a starboard port through the hollow of the duct,
And a second flow path portion provided on the opposite side of the first flow path portion and having a smaller flow area than the first flow path portion.
The width of the upper surface of the duct,
And a lightweight structure having a ratio of 0.3 to 0.5 with respect to a width of the lower surface of the duct.
In the duct,
And a light weighted structure provided upwardly away from a central axis of the propeller.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020130088845A KR101911100B1 (en) | 2013-07-26 | 2013-07-26 | Propulsion improving apparatus of ship |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020130088845A KR101911100B1 (en) | 2013-07-26 | 2013-07-26 | Propulsion improving apparatus of ship |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20150014041A KR20150014041A (en) | 2015-02-06 |
KR101911100B1 true KR101911100B1 (en) | 2018-10-24 |
Family
ID=52570994
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020130088845A KR101911100B1 (en) | 2013-07-26 | 2013-07-26 | Propulsion improving apparatus of ship |
Country Status (1)
Country | Link |
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KR (1) | KR101911100B1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008239060A (en) * | 2007-03-28 | 2008-10-09 | Mitsui Eng & Shipbuild Co Ltd | Stern oblong duct and vessel |
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2013
- 2013-07-26 KR KR1020130088845A patent/KR101911100B1/en active IP Right Grant
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008239060A (en) * | 2007-03-28 | 2008-10-09 | Mitsui Eng & Shipbuild Co Ltd | Stern oblong duct and vessel |
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Publication number | Publication date |
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KR20150014041A (en) | 2015-02-06 |
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