JPH11129976A - Wind pressure resistance reducing device of ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce with pressureresistance generated at navigation by a living section installed in a cargo ship such as tanker ro bulk carrier by relatively simple facilities and construction work without changing arrangement of the living rooms is the living section. SOLUTION: On the front face 4 receiving wind pressure of a living section 1 installed on the deck of a hull, a belt-like plate 7 of fixed width is projectingly provided along the end side 6 of the front face of the living second and spacedly from the end side 6 by a fixed space, and by the belt-like plate 7, wind pressure resistance received with the living section front face 4 at naveigation is appropriately reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for reducing wind pressure resistance of a ship.

[0002]

2. Description of the Related Art In a cargo ship such as a tanker or a bulk carrier, a living space in which a steering room, a crew's room, and the like are arranged on an upper deck of a hull is provided. As shown in FIG. 5, the living quarter 1 has a multi-layer structure having a front surface 4 in the ship width direction and a side surface 5 in the hull length direction substantially perpendicular to the front surface 4, which receives wind pressure resistance during navigation of the ship. A lower portion 1a having a predetermined width a and a predetermined height c;
The upper layer portion 1b is provided with a dodger 2 which extends left and right in the width direction of the hull and is used for watching over a shore.
3 is a chimney. Such a residential area 1 is usually arranged on the stern side of the hull.

[0003] The living quarters 1 installed on the stern side of the upper deck of the hull receive a large wind pressure resistance when the ship is navigating, which hinders navigation and wastes energy, and inevitably increases fuel efficiency. Accordingly, various studies have been made on measures for reducing the wind pressure resistance of the living quarters 1 during navigation and improving energy saving.

For example, Japanese Unexamined Patent Publication (Kokai) No. 58-164492 discloses a ship provided with a resistance reducing body having a shape which becomes smaller before and after the upper hull structure. And Japanese Utility Model Laid-Open No. 57-81993 discloses an upper structure of a ship (hereinafter referred to as Prior Art 2) in which the wind pressure resistance due to a head wind is as small as possible and the tailwind can be effectively used. Japanese Patent Publication No. Sho 62-112988 discloses a living quarter structure (hereinafter referred to as Prior Art 3) of a ship in which the wind pressure is reduced by locating the corner of the living quarter toward the forward side of the bow.
Japanese Patent Application Laid-Open No. 61-27789 discloses a device in which a flow guide plate is provided at a corner of a structure on a deck, and the wind pressure resistance of a ship is reduced by the flow guide plate (hereinafter referred to as prior art 4).
Is disclosed.

[0005]

However, in the case of a structure in which the shape of the living quarter is largely changed as in the prior arts 1 to 3, it becomes difficult to arrange the living room and wasteful space is generated in the living quarter. Might be. In addition, as in the prior art 4, the installation of the flow guide plate at the corner of the structure on the deck,
There is a problem that much trouble is required for the installation work.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, and to reduce the wind resistance generated during navigation by a habitat installed on the upper deck of a cargo ship such as a tanker or a bulk carrier. Without changing the arrangement in the ward from the conventional one, it can be appropriately reduced with relatively simple equipment and construction, and the energy saving of the ship can be improved,
An object of the present invention is to provide a wind pressure resistance reducing device for a ship.

[0007]

Means for Solving the Problems The present inventors change the wind resistance caused by the living quarters installed on the hull upper deck during navigation of a cargo ship, by changing the arrangement in the living quarters to the conventional one. Intensive research was conducted to develop a device that could be appropriately reduced by relatively simple equipment and construction. As a result, it was found that if a fixed band-shaped plate for reducing wind pressure resistance is attached to the front of the living area that receives wind pressure resistance during navigation in the navigation direction, this band-shaped plate can reduce wind pressure resistance during navigation. did.

The present invention has been made based on the above findings, and the invention according to claim 1 is provided on a deck of a hull and receives a wind pressure resistance when the marine vessel is navigating, and has a frontal surface in the width direction of the hull. A living space consisting of a structure having a side surface in the longitudinal direction of the hull substantially perpendicular to the front surface, wherein the front surface receiving the wind pressure resistance is spaced apart from the front edge by a predetermined distance. A band-shaped plate with a predetermined width is projected along
The band-shaped plate is characterized in that the wind pressure resistance applied to the front of the living quarter during navigation is reduced.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the apparatus is provided along a side edge of a dodger provided in an upper part of a living quarter in a boat width direction and at a predetermined interval from the edge side. It is characterized in that a band-shaped plate having a predetermined width is protruded.

According to a third aspect of the present invention, the width of the band-shaped plate protruding from the living quarter is within a range of 5 to 20% of the front width of the living quarter at the installation part, and the band-shaped plate is provided. Is characterized in that it is located at a distance equivalent to the width of the band-shaped plate from the edge of the residential area of the installation portion.

According to a fourth aspect of the present invention, the width of the band-shaped plate protruding from the dodger is in the range of 5 to 20% of the vertical width of both side edges of the dodger, and the width of the band-shaped plate is adjusted. The installation position is characterized in that it is located at a distance from the edge of the dodger equal to the width of the band-shaped plate.

[0012]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing a first embodiment of the device of the present invention, FIG. 2 is a schematic front view thereof, and a living quarter 1 has a front surface 4 in a ship width direction which receives wind pressure resistance during ship navigation. A lower part 1 having a predetermined width a and a predetermined height c having a side surface 5 in a hull length direction substantially perpendicular to the front surface 4.
a and an upper layer portion 1b having a width b smaller than the lower layer portion 1a.
As described above, the dodger 2 is provided for watching, etc. at the time of berthing, which extends right and left in the width direction of the hull.

According to the present invention, as shown in FIGS. 1 and 2, each of the front faces 4 of the lower layer section 1a and the upper layer section 1b in the living quarter 1 is spaced along the edge 6 thereof and at a predetermined distance from the edge 6. A belt-shaped plate 7 having a predetermined width is protruded.

Strip-like plate 7 projecting from lower layer portion 1a
The width of a is suitably 5 to 20% of the front width a of the lower layer portion 1a, and the width of the band-shaped plate 7b protruding from the upper layer portion 1b is 5 to 20% of the front width b of the upper layer portion 1b. Appropriate. Further, a band-like plate 7a protruding from the lower layer portion 1a.
, Ie, the distances e and f from the end side 6 are positions at a distance equivalent to the width of the band-shaped plate 7a, and the position of the band-shaped plate 7b protruding from the upper layer portion 1b, ie, The distances g and h from the edge 6 need to be at positions equivalent to the width of the band-shaped plate 7b.

FIG. 3 is a schematic perspective view showing a second embodiment of the apparatus of the present invention, and FIG. 4 is a schematic front view thereof. Second
In the device of the embodiment, the lower portion 1a and the upper portion 1b of the living quarter 1 in the device of the first embodiment described above.
In addition to the fact that a strip-shaped plate 7 of a predetermined width is protruded along each of the front sides 4 and at a predetermined interval from the side 6 at the front side 4 of the accommodation area 1, A strip-shaped plate 8 is also provided on each of the upper side, the lower side, and both end sides of the dodger 2 provided in the above.

The width of the band-shaped plate 8 protruding from the dodger 2 is suitably 5 to 20% of the vertical width d of both side edges of the dodger 2. In addition, the distance i of the band-shaped plate 8 attached to the dodger 2 from the edge 9 of the dodger 2 needs to be a position equivalent to the width of the band-shaped plate 8.

In the case of the conventional living space shown in FIG. 5 in which the above-mentioned band-shaped plate 7 or the band-shaped plates 7, 8 are not attached to the front surface 4 or the front surface 4 and the dodger 2 of the living room 1, The flow of wind received by the front 4 of the living quarter 1 in the forward direction of the ship is separated at the end 6 of the front 4 of the living quarter and the end 9 of the dodger 2 to generate a large vortex.

On the other hand, in the case of the present invention, the residential area 1
The front plate 4 or the front plate 4 and the dodger 2 are provided with the above-mentioned band-shaped plate 7 or the band-shaped plates 7 and 8.
There is an effect that the flow of the wind in the portion surrounded by the stagnation is stagnated, and the entire portion surrounded by the band-shaped plate becomes a structure having a volume.

The wind flow received from the front is once separated at the tip of the band-shaped plate 7 or 7, 8 to generate a vortex behind, but the wind flow is drawn by the rear edges 6, 9 and generated. As a result, the wind pressure resistance can be reduced as compared with the conventional living quarters.

As described above, the width of the band-shaped plate 7 or 7, 8 is set within the range of 5 to 20% of the width of the accommodation area of the installation portion, and the installation position is the edge of the accommodation area of the installation portion. Therefore, it is necessary to set the position at a distance equivalent to the width of the band-shaped plate 7 or 7, 8.

The width of the strip plate 7 or 7, 8 is
If the installation location is less than 5% of the front width of the living quarters, or if the installation location is not at a position equivalent to the width of the band-shaped plate 7 or 7, 8 from the edge of the installation quarters, As a result of the flow of the wind separated at the end of the band-shaped plate 7 or 7, 8 flowing backward as it is, the wind pressure resistance is not reduced.

On the other hand, the width of the band-shaped plate is more than 20% of the width of the living quarter of the installation portion, or the installation position is from the edge of the living quarter of the installation portion to the band-shaped plate 7.
Otherwise, if the position is not the same distance as the width of 7 or 8, the separated flow hits the belt-shaped plate 7 or 7, 8 and a new separation occurs, so that the wind pressure resistance cannot be reduced. A more preferable width and installation position of the band-shaped plate 7 or 7, 8 is about 10% of the front width of the living quarters in that part.

[0023]

FIG. 7 (a) is a schematic front view and FIG. 7 (b) is a schematic side view of a ship equipped with a conventional residential area shown in a schematic perspective view in FIG. A wind tunnel test was performed using a model of 1/50 of the actual ship size of a ship mounted in a residential area to which the belt-shaped plate was mounted. FIG.
(A) and (b) show the actual ship dimensions (m) of each part. Also,
A / A of each part in FIGS. 7A and 7B = 0.1, b
/B=0.1, c / C = 0.06, d / D = 0.12,
e / E = 0.11. The width of the strip plate is
It is the same as the distance from the end of the installation position.

FIG. 8 shows the results of the wind tunnel test. In FIG. 8, the horizontal axis indicates the wind direction (deg), and the vertical axis indicates the wind pressure resistance coefficient (C
x). Further, the mark ● indicates Cx when the device of the present invention shown in FIG. 7 is used, and the mark ○ indicates Cx when the conventional device shown in FIG. 6 is used. In addition, wind pressure resistance coefficient (Cx)
Is a numerical value obtained by the following equation.

Cx = Fx / (1/2 ρgV ² S) where Fx: resistance in the front-rear direction V: wind speed S: front projected area ρ: air density g: acceleration As is clear from FIG. °), the wind pressure resistance coefficient (Cx) is 1.118 when the conventional device is used, whereas it is 0.926 when the device of the present invention is used. 17.2% could be reduced.

Regarding the sea margin, which is used as an index for evaluating the profitability of the operation of a ship and is expected to increase the required horsepower due to wind pressure resistance and wave resistance, in the case of a full-size ship such as a tanker or a bulk carrier, when the ship is fully loaded, It is said that about one third of the sea margin is due to wind pressure resistance, and about one half of the sea margin in a ballast state is due to wind pressure resistance. According to the present invention, since the wind pressure resistance is reduced by about 15%, the sea margin of the ship can be reduced by about 5% in a full load state, and can be reduced by about 7% in a ballast state. .

[0027]

As described above, according to the present invention,
Due to the settlements installed on the hull upper deck of cargo ships such as tankers and bulk carriers, the wind resistance generated during navigation does not change the arrangement in the settlements from the conventional one,
Industrially useful effects can be obtained, which can be appropriately reduced with relatively simple equipment and construction, and can improve the energy saving of a ship.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of the device of the present invention.

FIG. 2 is a schematic front view of FIG.

FIG. 3 is a schematic perspective view showing a second embodiment of a living quarter shape according to the present invention.

FIG. 4 is a schematic front view of FIG. 2;

FIG. 5 is a schematic perspective view showing a conventional residential area shape.

FIG. 6 is a schematic perspective view of a model of a conventional ship used for a wind tunnel test.

FIG. 7 is a schematic front view and a schematic side view of a model of a ship on which the device of the present invention is installed, which is used for a wind tunnel test.

FIG. 8 is a diagram showing a wind tunnel test result.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Living area 1a Lower area of living area 1b Upper layer of living area 2 Dodger 3 Chimney 4 Front of living area 5 Side of living area 6 Edge of living area 7 Strip plate 8 Strip plate 9 Edge of dodger

Claims (4)

[Claims] 1. A structure having a front surface in a width direction of a ship, which is installed on a deck of a hull and receives wind pressure resistance during navigation of the ship, and a side surface in a hull length direction substantially perpendicular to the front surface. A strip-shaped plate having a predetermined width along the end side is provided at a predetermined interval from an edge of the front face on the front face receiving the wind pressure resistance. A wind pressure resistance reducing device for a ship, wherein the wind pressure resistance received by the ship is reduced. 2. A belt-like plate having a predetermined width is provided along a side edge of a dodger provided in an upper part of the living quarter in a boat width direction at a predetermined interval from the side edge. Wind pressure resistance reduction device. 3. The width of the strip-shaped plate protruding from the living quarter is 5 to 20% of the front width of the living quarter at the installation portion.
The wind pressure resistance reduction device according to claim 1, wherein the installation position of the band-shaped plate is a position equivalent to a width of the band-shaped plate from an edge of a residential area of the installation portion. 4. The width of the band-shaped plate protruding from the dodger is 5 to 20% of the vertical width of both side edges of the dodger.
The wind pressure resistance reduction device according to claim 2, wherein the installation position of the band-shaped plate is a position equivalent to a width of the band-shaped plate from an edge of a dodger.