KR20140036460A - Resistance reducing apparatus of ship, and ship having the same - Google Patents

Abstract

Disclosed are a resistance reducing device of a ship and a ship having the same. According to an embodiment of the present invention, the resistance reducing device of a ship includes a fluid inlet at the body of a ship; a storage tank for storing a fluid flowing in through the fluid inlet; and a fluid discharge unit for discharging the fluid stored in the storage tank. The fluid discharge unit discharges the fluid to reduce wave making resistance caused on the side of the ship.

Description

Technical Field [0001] The present invention relates to a ship's resistance reducing device and a ship equipped with the same,

The present invention relates to an apparatus for reducing resistance of a ship capable of reducing the wave resistance and a ship equipped with the apparatus.

Operated ships are subjected to wave resistance because they make waves on the surface of the water. The wave resistance takes up a large part of the resistance that the hull receives from the water, causing a large energy loss during operation. Therefore, ship hull research has been focused on the development of a linear model that can reduce the wave resistance.

The bulbous bow is a typical linear type that reduces the resistance to wave, and it is adopted by most ships in recent years. It is a bulb that protrudes forward from the athlete below the water surface. The ball athlete reduces the wave resistance by reducing the wave generated at the athlete by causing a wave that can cancel the wave caused by the athlete during the operation of the ship.

Conventional athletes are designed to achieve optimum effects under the condition that the vessel maintains its full condition and operates at design speed. Here, the design speed means the speed at which the shipbuilder must satisfy the ship's construction contract conditions, which can be achieved at 85 to 90% of the maximum output of the engine.

However, most ships do not maintain full load drafts or maintain design speeds during actual operations. In other words, when the cargo is not loaded or loaded in small quantities, it is often operated at a low speed in consideration of the transportation schedule and fuel consumption. Hereinafter, such a state is referred to as a light state state. If the operating conditions of the ship are different from the design conditions of the athlete, the athlete may increase the resistance rather than contribute to reducing the wave resistance.

For this reason, recently, techniques have been proposed that can reduce the wave resistance not only in the full load condition but also in the light load condition. Japanese Unexamined Patent Application Publication No. 2006-188125 (published on July 20, 2006) and Japanese Unexamined Patent Publication No. 2005-238909 (published on September 8, 2005) And suggests a concept player capable of improving performance.

Patent Document 1: Japanese Unexamined Patent Application Publication No. 2006-188125 (published on July 20, 2006) Patent Document 2: Japanese Laid-Open Patent Publication No. 2005-238909 (disclosed on September 8, 2005)

The embodiment of the present invention is intended to provide a resistance reducing device for a ship capable of reducing the wave-breaking resistance not only in a full state but also in a light state, and a ship equipped with the same.

Or embodiments of the present invention are intended to provide a device for reducing resistance of a ship capable of reducing the wave resistance not only at a design speed but also at a low speed, and a ship equipped with the device.

According to an aspect of the invention, there is provided a hull comprising: a fluid inlet formed in a hull; A storage tank for storing the fluid introduced from the fluid inlet; And a fluid discharging means for discharging the fluid stored in the storage tank, wherein the fluid discharging means may be provided with a resistance reducing device for a ship discharging fluid to reduce the wave resistance generated at the side of the hull .

And the fluid inlet may be provided at an end of a spherical bow formed in the hull.

First opening means for opening and closing said fluid inlet; And a controller for receiving information on the speed of the ship or the draft of the ship and controlling the open range of the first open means.

The fluid discharge means comprises a pump; And a fluid outlet located on the upper surface of the spherical aft vessel.

The fluid discharge port may be located in front of the lowest position of the water surface osteoclasts occurring on the side of the hull.

And the fluid discharge port may be located in front of the 1/10 position of the hull length.

And a controller for receiving information on the speed of the ship or the draft of the ship and controlling the driving of the pump.

And a bypass passage capable of discharging the fluid introduced into the fluid inlet to the fluid outlet without passing through the storage tank.

Third opening means for opening / closing the bypass passage; And a controller for receiving the information on the speed of the ship or the draft of the ship and controlling the open range of the third open means.

Second opening means for opening and closing said fluid outlet; And a controller for receiving information on the speed of the ship or the draft of the ship and controlling the open range of the second open means.

The fluid discharging means may comprise a plurality of different positions, and the fluid discharging means may further include a flow path selecting means for opening and closing at least one flow path of the plurality of fluid outlets. .

And a controller for receiving information on the speed of the ship or the draft of the ship and controlling the open range of the flow channel selecting means.

According to another aspect of the present invention, a vessel equipped with the above-described resistance reducing device can be provided.

The apparatus for reducing the resistance of a ship according to an embodiment of the present invention is characterized in that when a ship is operated in a light condition, the stream discharged by the fluid discharging means adds energy to waves generated by the spherical athlete to produce a larger new wave, The wave generated by the athlete can be interfered with, and the digging occurring on the athlete side can be reduced. Therefore, it is possible to reduce the wave resistance even when the ship is operated not only in a full state but also in a light state.

In addition, the storage tank can be used to store and discharge the fluid according to the draft or speed of the ship.

Further, the bypass can be used to directly discharge the fluid without passing through the storage tank.

In addition, the control unit can control the inflow and outflow according to the draft or speed of the ship.

FIG. 1 is a view showing the flow of waves in a full state.
Fig. 2 is a photograph showing the flow of waves at full speed or at high speed.
3 is a view showing the flow of waves in a light state.
4 is a view showing the flow of waves in a light state.
5 is a perspective view showing a ship's resistance reducing apparatus according to the first embodiment of the present invention.
6 is a structural diagram showing a ship's resistance reducing apparatus according to the first embodiment of the present invention.
7 is a perspective view showing a ship's resistance reducing apparatus according to a second embodiment of the present invention.
8 is a structural diagram showing a ship's resistance reducing apparatus according to a second embodiment of the present invention.
9 is a perspective view showing a ship's resistance reducing apparatus according to a third embodiment of the present invention.
10 is a structural view showing a ship's resistance reducing apparatus according to a third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as disclosed to the person having ordinary skill in the art to which the invention pertains. have. For the sake of clarity, the drawings are not drawn to scale, and the size of the elements may be slightly exaggerated to facilitate understanding.

1 and 2 are drawings and photographs showing the flow of waves in a full state. According to the experiment, since the full state of the wave and the wave current at the high speed are similar to each other, FIGS. 1 and 2 can be regarded as wave currents at high speed. Here, high-speed means the design speed, which can be achieved at 85 to 90% of the engine's maximum output.

The spherical athlete 12 protrudes forward from the lower side of the bow 11 in a spherical shape. As shown in Fig. 1, the ball player 12 causes a wave B while keeping the ball under the water surface while the ship is in full operation. The wave B generated by the spherical auger 12 influences the wave A generated by the bow 11 so that the wave A generated by the bow 11 is converted into a new wave P having a relatively weak energy Thereby reducing the ripple resistance.

The size and shape of the spherical athlete 12 are generally designed in consideration of the case where the ship is operated at a design speed in a fully loaded state as in the example of Fig. Therefore, the spherical athlete 12 generates a wave B which cancels the wave A generated by the bow 11 when the ship is operated in accordance with the design conditions thereof to generate a deformed wave P, The reduction effect can be maximized.

As a matter of course, the operating condition (loading state or speed of operation) may be different depending on the type of ship, so that the pilot 12 can be designed to exhibit the optimum effect considering the operating conditions of the ship. That is, the load condition is not designed to exert the optimum effect.

3 and 4 are drawings and photographs showing the flow of waves in a light state.

If the operating conditions of the ship are different from the design conditions of the spherical athlete 12, the effect of reducing the spherical athlete's resistance by the spherical athlete 12 may be reduced, or the spherical athlete 12 may increase the wave resistance.

For example, as shown in Fig. 3, a ship operating in a light load state in which no cargo is loaded or a small amount of cargo is loaded can be lifted up to the upper surface of the spherical athlete 12, have. In this case, since the wave C generated by the ball 12 is relatively small, it does not greatly affect the wave A generated by the bow 11. In other words, in the light state, the spherical auger 12 can not generate a wave B having a large energy as in the case of Fig. 1 (full state) because the water flow flowing along the upper surface thereof is weak, (C). Therefore, the wave C generated by the spherical auger 12 in the light state does not help to reduce the wave resistance.

3 shows the wave P generated by the wave 11 generated by the bow 11 and the wave C generated by the spherical athlete. It should be noted, however, that this is only a convenience, but there is a difference in reality.

In addition, when the wave (B) generated by the spherical athlete (11) and the wave (A) generated by the bow (11) overlap with each other according to the operating conditions, the phenomenon of increasing the wave resistance may occur.

The resistance reducing device 31 according to the first embodiment can prevent the wave C generated by the spherical auger 12 from being generated by the function of the fluid discharge means 300 even when the ship is operated in a light state or at a low speed, (E), the effect of reducing the wave resistance can be improved. This is explained in detail below.

FIG. 5 is a perspective view showing a ship's resistance reducing apparatus 31 according to a first embodiment of the present invention, and FIG. 6 is a structural view.

The apparatus for reducing resistance of a ship according to the first embodiment of the present invention includes a fluid inlet 100 formed in a hull 10, a storage tank 200 for storing inflowed fluid, And a discharge means (300). And may include a coupling tunnel 400 that is used as a path through which fluid may travel.

The fluid inlet 100 may be provided at the tip of the spherical bore 12 located below the waterline. The leading end of the spherical athlete (12) is a portion where a large pressure (water pressure) acts when the ship is operating. Accordingly, when the fluid inlet 100 is provided at the tip of the spherical forehead 12, the fluid can smoothly flow into the tunnel when the vessel is operated, and the resistance due to the inflow of the fluid can be minimized. In addition, when the fluid inlet 100 is formed at the point where the water pressure is the greatest, the resistance of the hull 10 can be reduced accordingly, thereby improving the propulsion performance of the ship.

Here, the case where the fluid inlet 100 is provided at the tip of the spherical bore 12 is illustrated, but the position of the fluid inlet 100 is not limited thereto. The fluid inlet 100 may be changed to a position slightly displaced from the tip of the spherical auger 12, that is, a lower or upper position on the front side of the spherical auger 12, or the like. Here, the expression 'forward' means the direction in which the ship is moving.

Even if the fluid inlet 100 is located on the rear side of the spherical bore 12 or the other side of the hull 10 other than the spherical bore 12, the fluid inlet 100 is located below the waterline, It can be possible as its position.

The position of the fluid inlet 100 may be determined in consideration of the inflow pressure of the fluid and the resistance of the fluid inlet 100.

In addition, the fluid inlet 100 may have an elliptical shape or a polygonal shape as well as a circular shape, and a plurality of the fluid inlet 100 may be provided at mutually spaced positions according to the design conditions of the ship.

The storage tank 200 is a space for storing the fluid introduced from the fluid inlet 100. The reason why the storage tank 200 is used is to control the amount of the fluid to be introduced and the amount to be discharged different from each other or the case where the time to introduce the fluid is different from the time to discharge the fluid.

The storage tank 200 does not discriminate its position if it exists in the hull 10. Also, the storage tank 200 provided in the hull 10 may be used as well as the storage tank 200 dedicated to the resistance reducing apparatus 31 according to the first embodiment of the present invention. For example, ballast tanks are used.

The fluid discharge means 300 is means for discharging the fluid out of the hull 10 in order to reduce the wave resistance generated on the side of the hull 10.

The fluid discharge means 300 may include a pump 310 and a fluid outlet 320 to discharge fluid from the storage tank 200. Also, an outlet connection tunnel 420, which is connected to the fluid outlet 320 and functions as a fluid flow passage, may be provided.

The fluid outlet 320 of the resistance reducing device 31 according to the first embodiment of the present invention may be provided at the center of the spherical upper surface X (see FIG. 4) of the rear remote from the fluid inlet 100. Therefore, the water flow D discharged from the fluid inlet 100 can flow in the port direction and the star direction of the hull 10 after being split to both sides by the bow 11 as shown in Fig. Here, the expression 'rear' means the direction opposite to the direction in which the ship is moving.

The pump 310 is used to discharge the fluid stored in the storage tank 200 to the fluid outlet 320. The fluid is discharged to the outside of the hull 10 through the fluid outlet 320 by the pressure change by the pump 310. The fluid discharge amount and the speed may be different depending on the operation speed of the pump 310 or the like.

At least two fluid outlets 320 may be provided at different positions. The plurality of fluid outlets 320 have the advantage of being able to cope with the wave resistance which varies depending on various operating conditions.

In this case, the fluid discharging means 300 may include a flow path selecting means 330 for selecting a plurality of fluid discharging ports 320. The flow path selecting means 330 opens and closes at least one of the plurality of fluid outlets 320 to induce fluid to be discharged to the fluid outlets 320 that can exhibit an optimum wave resistance reduction effect.

The connection tunnel (400) includes connecting to the storage tank (200). The outlet connection tunnel 420 connects the storage tank 200 and the fluid outlet 320 as well as the inlet connection tunnel 410 connecting the fluid inlet 100 and the storage tank 200. The pump 310 may be located in the middle of the outlet connection tunnel 420.

The connection tunnel 400 may be provided to correspond to a plurality of fluid inlets 100 or fluid outlets 320. And may be formed so as to extend in a curved shape from the fluid inlet 100 toward the fluid outlet 320 for smooth fluid flow and to have an inclination toward the rear upward when reaching the fluid outlet 320. [

Sectional area of the inlet connection tunnel 410 and the outlet connection tunnel 420 may be equally provided from the fluid inlet 100 to the fluid outlet 320 to reduce the resistance of the fluid flowing inside the connection tunnel 400 . Of course, if the speed of the water D discharged to the fluid outlet 320 is increased, the sectional area may gradually decrease toward the fluid outlet 320.

The inclination of the outlet connection tunnel 420 determines the direction of the water flow D discharged through the fluid outlet 320 and the water flow D is transmitted to the wave C generated by the spherical bowler 12 And a new wave (E) is created. Therefore, the inclination of the tunnel toward the fluid outlet 320 can be selected at an appropriate angle in consideration of the operating conditions of the ship, the size and shape of the spherical auger 12, and the like.

Hereinafter, the effect of reducing the ripple resistance by the fluid discharging means 300 of the resistance reducing apparatus 30 according to the first embodiment of the present invention will be described in detail.

The fluid flowing into the fluid inlet port 100 located in the spherical forehead 12 flows through the fluid tunnel of the spherical forehead surface X through the connecting tunnel 400, (Not shown). As shown in FIG. 3, the water D discharged from the fluid outlet 320 has a relatively large flow velocity as compared with the wave C generated by the spherical auger 12, so that the wave generated by the spherical auger 12 (C), and at the same time, the flow rate of the fluid flowing on the spherical upper surface (X) is also increased.

As a result, the water stream D discharged from the fluid outlet 320 in the light state adds energy to the wave C generated by the spherical auger 12 to produce a larger new wave E, And interferes with the wave (A) generated by the ship (11), thereby reducing the wave height at the bow (11) side when the ship is operated. At this time, since the new wave E is close to the size of the wave B (see Fig. 1) generated by the spherical auger 12 when the ship is operated in the full state, the wave resistance .

That is, even if the new wave E is not the same as the wave B generated by the spherical athlete 12 in the state of operating in the full state, the new wave E has energy equivalent to the wave B generated by the spherical athlete 12, The wave (A) generated by the player 11 is interfered with, so that the wave resistance can be reduced.

5, the water D discharged from the fluid outlet 320 rises from the spherical bowler 12 by the force of jetting and falls, and the flow rate of the upper portion of the spherical bowler 12 is increased Such a fluid flow can help to reduce wave resistance by causing water disturbance to reach the surface of the water. In other words, the water flow D causes fluid disturbance near the bow 11, and this wave disturbance interferes with the wave A caused by the bow 11, thereby reducing the energy of the wave A, thereby reducing the wave resistance .

However, the draft varies according to the loading condition, and the speed varies depending on the operating conditions. In this case, if the fluid discharge means 300 discharges the same amount of fluid, it is difficult to obtain an optimum wave-resistance reduction effect under various conditions.

The ship's resistance reducing apparatus 31 according to the first embodiment of the present invention uses the storage tank 200 to achieve an optimum wave resistance reduction effect under various conditions. The storage tank 200 stores the fluid introduced through the fluid inlet 100 and discharges the necessary amount of fluid to the outside of the ship 10 through the fluid discharge means 300 when necessary.

The closer the vessel is to the light state, the less the effect of reducing the wave resistance by the spherical forehead 12, and the resistance is increased thereby, so the amount of fluid discharged through the fluid discharge means 300 or the velocity of the fluid must increase. In contrast, the closer the vessel is to the design conditions of the spherical athlete 12, the smaller the amount of fluid discharged through the fluid discharge means 300 or the velocity of the fluid.

The fluid inlet port 100 is connected to the first opening means 710 and the fluid outlet port 320 is connected to the second opening means 720 to control the amount of fluid discharged through the fluid outlet means 300 or the speed of the fluid, . ≪ / RTI >

The first opening means 710 is a means for opening and closing the fluid inlet 100. It is also possible to change the sectional area of the fluid inlet 100 by varying the degree of opening /

It is also possible to shut off the resistance that may be generated by the fluid inlet 100 and extend the life of the resistance reducing device 31 by completely closing the fluid inlet 100 when the fluid discharging means 300 is not operated .

The second opening means 720 is a means for opening and closing the fluid outlet 320, and may have a different opening degree as the first opening means 710. The amount of fluid discharged through the fluid outlet 320 or the velocity of the fluid may vary depending on the degree of opening of the second opening means 720. As a result, it is possible to exhibit the optimum wave resistance reduction effect under various conditions.

The resistance reducing apparatus 30 according to the embodiment of the present invention may include a bypass passage for guiding the flow of the fluid by directly connecting the fluid inlet 100 and the fluid outlet 320 when the storage tank 200 need not be routed 500). When the fluid is discharged to the fluid outlet 320 through the bypass passage 500 without passing through the storage tank 200, the inflowing and outgoing flows are the same. Energy is also saved because no separate pump 310 operation is required. However, the inflow rate or the withdrawal rate may be adjusted by adjusting the first opening means 710 or the second opening means 720.

The bypass passage 500 is openable and closable by the third opening means 730. That is, the third opening means 730 can determine whether the fluid to be introduced is stored in the storage tank 200 or discharged directly through the bypass passage 500. The third opening means 730 can simultaneously open the flow of the fluid through the bypass passage 500 and the flow of the fluid flowing through the storage tank 200. In addition, Branching may also be possible.

The resistance reducing apparatus 31 according to the first embodiment of the present invention may include a control unit 600. [ The controller 600 receives the information on the speed of the ship or the draft of the ship to receive the pump 310, the first opening means 710 to the third opening means 730 ), Or the flow path selecting means 330. [

The controller 600 may control the pump 310. By controlling the driving of the pump 310, the pressure of the discharged fluid can be different. By varying the pressure of the discharged fluid, the amount of the fluid or the velocity of the discharged fluid can be adjusted, so that the optimum wave resistance reduction effect can be exhibited in various operating environments.

The control unit 600 may control the first opening means 710 to the third opening means 730. [ Control of the first opening means 710 for determining whether the fluid inlet 100 is opened or closed or control of the second opening means 720 for determining the opening or closing degree of the fluid outlet 320, The control of the third opening means 730 for determining whether the pass passage 500 is open or closed or the degree of opening of the pass passage 500 can exhibit the optimum wave resistance reduction effect in various operating environments.

For example, if it is not necessary to drive the resistance reducing apparatus 30, the fluid opening 100 can be closed by the first opening means 710 and the fluid outlet 320 can be closed by the second opening means 720 have. When the fluid stored in the storage tank 200 is sufficient, the fluid inlet 100 may be closed by the first opening means 710 and the fluid outlet 320 may be opened by the second opening means 720 have. In addition, by adjusting the degree of opening / closing of the first opening means 710 and the second opening means 720, the fluid amount or the discharge speed of the discharged fluid can be adjusted for reducing the wave resistance depending on the operating environment. The third opening means 730 can be controlled to decide whether to use the bypass passage 500 or the degree of opening when used in combination with the storage tank 200.

The ship's resistance reducing apparatus 32 according to the second embodiment of the present invention can reduce the resistance of the ship by reducing the position of the fluid outlet 321 and the wave resistance of the vessel according to the first embodiment of the present invention, The method for reducing is different.

FIG. 7 is a perspective view showing a ship's resistance reducing apparatus 32 according to a second embodiment of the present invention, and FIG. 8 is a structural view.

If the ship is not operated under the design conditions of the constituent skaters 11, that is to say at a draft below the full draft, or at a speed lower than the design speed, the side of the skater 11 The waveform that flows along will have a larger wave height, which is the height between the wavefront (Y) and the wave crest (Z) when compared to the design conditions. This can be easily understood by comparing Figures 1 and 3, or Figures 2 and 4.

At this time, when the fluid outlet 321 is positioned on the upper side or the front side of the osteoclast Y of the corrugation, the subsequent wave is influenced and the corrugation can be lowered. That is, when the fluid outlet 321 is positioned in front of the lowest position of the osteolysis Y, the wave height is lowered, thereby reducing the wave resistance.

Experiments have shown that the osteolysis (Y) appears within 18/20 of the ship's entire length in the direction of the bow (11) from the stern of the ship, within a distance (l, see Fig. That is, when viewed from the stern, when the entire length of the ship is divided into 20 equal parts, the osteochal (Y) is generally formed between 18 and 20 parts of the ship.

Therefore, if the fluid outlet 321 is located in front of the 1/10 position of the length of the hull 10, it is possible to prevent the fluid at the lowest position of the osteophyte Y of the water surface wave generated on the side of the hull 10, And the depth of the osteoclast (Y) is reduced. It also affects the subsequent waveforms, lowering the wave height and consequently reducing the wave resistance.

However, it is common that no osteoclast (Y) occurs at the back of 18 station (l). If osteoclastic (Y) occurs at the back of 18 station (l) It is also possible for the fluid outlet 321 to be positioned behind the station l.

The fluid discharge ports 321 are provided in pairs because they are located on the side surfaces of the bow 11. When the wave is resisted by the water waves on both sides while the ship is operated, the fluid introduced by the fluid inlet 100 is discharged to both sides of the ship 10, so that the wave resistance Can be reduced.

FIG. 9 is a perspective view showing a ship's resistance reducing apparatus 33 according to a third embodiment of the present invention, and FIG. 10 is a structural view.

The vessel resistance reducing apparatus 33 according to the third embodiment of the present invention includes two or more fluid outlets 322 and 323 which are located at different positions from each other. The first fluid outlet 322 may be positioned on the spherical upper surface X and the second fluid outlet 323 may be positioned in front of the lowest position of the surface wave crest Y generated on the side of the hull 10. At this time, the second fluid outlet 323 is normally positioned in front of the 1/10 position of the length of the hull 10 as described above.

By providing two or more fluid outlets 322 and 323 at different positions, the wave resistance can be more effectively reduced as compared with the case including one fluid outlet. In addition, it is possible to reduce the ripple resistance under various conditions.

10: Hull, 11: Player,
12: ball player, 30: resistance reducing device,
100: fluid inlet, 200: storage tank,
300: fluid discharge means, 310: pump,
320: fluid outlet, 322: first fluid outlet,
323: second fluid outlet, 330: flow path selecting means,
400: connection tunnel, 410: inlet connection tunnel,
420: outlet connection tunnel, 500: bypass passage,
600: control unit, 710: first opening means,
720: second opening means, 730: third opening means,

Claims (13)

A fluid inlet formed in the hull;
A storage tank for storing the fluid introduced from the fluid inlet; And
And fluid discharge means for discharging the fluid stored in the storage tank.
Wherein the fluid discharge means discharges the fluid to reduce the wave resistance generated at the side of the hull. The method of claim 1,
Wherein the fluid inlet is located at the tip of a spherical bow formed on the hull. The method of claim 1,
First opening means for opening and closing said fluid inlet; And
And a control unit for receiving information on the speed of the ship or the draft of the ship and controlling the opening range of the first opening means. The method of claim 1,
The fluid discharge means
Pump; And
Reducing resistance of the ship comprising a fluid outlet located on the upper surface of the bulbous bow. 5. The method of claim 4,
Wherein the fluid discharge port is located in front of a lowest position of the water wave osteolysis occurring on the side of the hull. 5. The method of claim 4,
And the fluid discharge port is located in front of the 1/10 position of the hull length. 5. The method of claim 4,
And a control unit for receiving information on the speed of the ship or the draft of the ship and controlling the driving of the pump. 5. The method of claim 4,
And a bypass passage for discharging the fluid introduced into the fluid inlet to the fluid outlet without passing through the storage tank. 9. The method of claim 8,
Third opening means for opening / closing the bypass passage; And
And a control unit for receiving information on the speed of the ship or the draft of the ship and controlling the open range of the third open means. 5. The method of claim 4,
Second opening means for opening and closing said fluid outlet; And
And a control unit for receiving information on the speed of the ship or the draft of the ship and controlling the open range of the second open means. 5. The method of claim 4,
Wherein the plurality of fluid discharge ports are formed in different positions,
Wherein the fluid discharging means further comprises flow path selecting means for opening and closing at least one flow path of the plurality of fluid outlets. 12. The method of claim 11,
And a controller for receiving information on the speed of the ship or the draft of the ship and controlling the open range of the flow channel selecting means. Ship having a resistance reduction device according to any one of claims 1 to 12.

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