KR101487658B1 - Resistance reducing apparatus of ship, and ship having the same - Google Patents

Abstract

An apparatus for reducing resistance of a ship and a ship equipped with the apparatus are disclosed. The apparatus for reducing resistance of a ship according to an embodiment of the present invention includes a pump provided in a hull, a guide channel having one end communicated with the pump and disposed outside the hull, and a fluid outlet formed at the other end of the guide channel , And the fluid discharged through the fluid outlet may reduce the wave resistance generated at the side of the hull.

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 wave resistance. It is adopted by most ships in recent years. It is a form protruding from the athlete below the surface in a spherical shape toward the front, which is also called a concept player. The player's bulb reduces the wave resistance by reducing the wave generated at the bow by causing a wave that can cancel the wave generated by the bow during the operation of the ship.

Normally, a bow bulb is designed to provide the optimum effect under the condition that the ship maintains full load 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 ship's operating conditions are different from the design conditions of the bow bulb, the bow bulb may lead to an increase in resistance rather than contributing 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 a player bulb that can improve 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 present invention, there is provided a hull comprising: a pump provided in a hull; a guide channel communicating with the pump at one end and disposed outside the hull; and a fluid outlet provided at the other end of the guide channel, The fluid discharged through the fluid discharge port varies in accordance with the waveform of the water surface wave depending on the loading state or speed of the ship, Thereby reducing the resistance of the wave generated at the side of the hull.

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The fluid outlet may be provided with a speed regulator capable of regulating the speed of the discharged fluid.

The guide passage may guide the fluid downward along the bow, and the fluid outlet may be branched to the right and left of the bow.

The guide passage may be provided with an apparatus for reducing the resistance of the ship, the length of which can be variably controlled.

The guide passage or the fluid discharge port may have one or more joints to adjust the angle of the ship in the longitudinal direction thereof.

The pump or the guide passage may be provided with an apparatus for reducing the resistance of a ship capable of sliding movement in the longitudinal direction of the ship.

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 controller for receiving information on the speed of the ship or the draft of the ship and controlling the operation of the speed regulator.

And a controller for controlling the length or angle of the guide passage by receiving information on the speed of the ship or the draft of the ship.

And a controller for receiving information on the speed of the ship or the draft of the ship and controlling the sliding motion of the pump or the guide passage.

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 can raise the osculation of the water waves by the fluid discharged to the fluid discharge port by the pump when the ship is operated in a light condition. 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, when the ship is operated in a light condition, the stream discharged to the fluid outlet adds energy to the waves generated by the player bulb to create a larger new wave, and these waves interfere with the waves generated by the athlete, . 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 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.
2 is a view showing the flow of waves in a light state.
3 is a side view showing a ship's resistance reducing apparatus according to the first embodiment of the present invention.
4 is a front view showing a ship's resistance reducing apparatus according to the first embodiment of the present invention.
5 is a front view showing a ship's resistance reducing apparatus according to a second embodiment of the present invention.
6 is a side view showing a ship's resistance reducing apparatus according to a third embodiment of the present invention.
7 is a side view showing a ship's resistance reducing apparatus according to a fourth embodiment of the present invention.
FIG. 8 is a side view showing a ship's resistance reducing apparatus according to a fifth 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.

FIG. 1 is a view showing the flow of waves in a full state. According to the experiment, the full-wave state and the wave flow at the high speed are similar to each other. Therefore, FIG. 1 can be regarded as a wave flow 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 player bulb 12 protrudes forward from the lower side of the bow 11 in a spherical shape. As shown in Fig. 1, the bow bulb 12 generates a wave B while keeping the boat under the water surface while the ship is in full operation. The wave B generated by the player bulb 12 has the effect of reducing the wave P generated at the bow 11 by canceling the wave A generated by the bow 11 to reduce the wave resistance .

The size and shape of the bow bulb 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. The player bulb 12 generates a wave B that 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.

Of course, the ship's bulb 12 may be designed to exhibit the optimum effect in consideration of the operating conditions of the ship, since the ship's conditions may vary depending on the type of ship (loading state or speed of flight). That is, the load condition is not designed to exert the optimum effect.

2 is a view showing the flow of waves in a light state.

If the operating conditions of the ship are different from the design conditions of the bow bulb 12, the effect of reducing the wave resistance by the bow bulb 12 may be reduced, or the strength of the wave resistance may be increased due to the bow bulb 12.

For example, as shown in Fig. 2, when a ship is operated in a light load state in which no cargo is loaded or a small amount of cargo is loaded, the upper surface of the bow bulb 12 may approach the water surface or even rise above the water surface have. In this case, since the wave C generated by the player bulb 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 bow bulb 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 player bulb 12 in the light state does not greatly help to reduce the wave resistance.

For this reason, FIG. 2 shows the wave (P) generated by the wave (A) generated by the player (11) and the wave (C) generated by the player bulb equally. It should be noted, however, that this is only a convenience, but there is a difference in reality.

In addition, when the wave (C) generated by the Kusan player (11) and the wave (A) generated by the player (11) overlap with each other according to the operating conditions, the wave resistance may increase rather.

If the vessel is not operated under the design conditions of the constituent bowls 11, that is to say at a draft below the full draft, or at a lower speed than the design speed, the side of the bow 11, beyond the bow bulb 12, 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 FIG. 1 and FIG.

Therefore, if the crest Y is raised and the parasail Z is lowered and consequently the crest can be reduced, the wave resistance generated at the side of the hull 10 can be greatly reduced. According to the experiment, when the osteoclast (Y) is increased, the parquet (Z) is lowered, and consequently the corrugation is reduced.

In order to reduce the wave resistance of the ship in the light condition, new energy is supplied to the waves generated by the forward bulb 12 to generate a wave similar to a full-wave full-wave energy (B) , Or by supplying the flow rate to the osteoclast (Y) to reduce the wave height. For the first method, a stream of water should be supplied near the bow bulb (12), and for the second method, water should be supplied to or from the osteoclast (Y).

Therefore, in order to reduce the wave resistance, it is possible to supply the fluid from the upper portion (X) to the osteolysis (Y) to the portion where the effect of reducing the wave resistance is the largest.

At this time, the place where the effect of reducing the wave resistance is greatest depends on the loading state and speed of the ship.

FIG. 3 is a side view showing the ship's resistance reducing apparatus 30 according to the first embodiment of the present invention, and FIG. 4 is a front view thereof.

The apparatus for reducing resistance of a ship according to the first embodiment of the present invention includes a pump 100 for discharging fluid to the outside of the ship 10, a guide passage 200 for guiding the fluid discharged from the pump 100, And a fluid outlet 300 located at the end of the guide passage 200.

The pump 100 is for discharging the fluid to the outside of the ship 10. The fluid can be received in a tank or the like provided inside the ship 10 and the fluid flowing under the water line can be received by the pump 100, As shown in FIG.

The apparatus for reducing resistance of a ship according to the first embodiment of the present invention includes a guide passage 200 for guiding a fluid along an outer wall of the ship 10 and a fluid outlet 300 connected to the guide passage 200, The fluid can be supplied to a desired location without a hole.

The guide channel 200 may extend along the bow 11 to a desired position. There is an advantage that the fluid can be supplied to both side surfaces of the hull 10 by using the single guide passage 200 when the guide passage 200 is connected along the bow 11. Therefore, when the guide channel 200 is connected along the side surface of the ship 10, two or more guide channels 200 should be provided on both sides.

FIG. 4 shows that the guide passage 200 and the fluid outlet 300 are located at the center of the front of the ship. At this time, the fluid discharged through the fluid outlet 300 is divided into two bifurcations along both sides of the bow 11 and supplied to both sides of the hull 10. Since the fluid of the same degree is supplied to both sides, the effect of reducing the wave resistance is the same on both sides of the hull 10.

The length of the guide passage 200 may be variable. It may be necessary to adjust the height at which the water line is changed depending on the loading state of the ship and the fluid must be supplied by the wave of the sea. In this case, it is possible to adjust the length of the variable guide passage 200 to supply the fluid at a desired height.

The fluid outlet 300 may be in the form of a diffuser. The diffuser has a cross-sectional area of the outlet larger than the inlet so as to discharge the fluid introduced from the pump 100 to a high pressure. When adjusting the cross-sectional area of the diffuser, the speed and pressure of the fluid can be controlled.

The fluid outlet 300 may include a velocity regulator 310. For example, it is possible to change the shape of the diffuser depending on the desired pressure or speed. If the inlet of the fluid outlet 300 is the same, the pressure increases and the velocity decreases as the outlet gets wider. As the outlet gets narrower, the pressure decreases but the velocity increases.

The use of the diffuser is merely an example of a speed adjuster 310 for adjusting the speed of the fluid and may be included in the speed adjuster 310 of the present invention if the speed is adjustable.

Further, the fluid outlet 300 may be present on the water line or may exist below the water line. If the fluid outlet 300 is present on the waterline, the discharge pressure will increase and disturbances due to the discharged fluid will increase. Conversely, if the fluid outlet 300 is below the waterline, the discharge pressure will decrease, but the disturbance due to the discharged fluid will also decrease.

5 is a front view showing a ship's resistance reducing apparatus 31 according to a second embodiment of the present invention.

The fluid outlet 301 may be separated from the guide passage 201 located at the center of the front surface of the hull 10 and divided into two for the purpose of a certain distance from the bow 11. [ That is, the distance from the branch point 330 of the guide passage 201 or the fluid outlet 301 can be adjusted to guide the fluid to a desired location.

6 is a side view showing a ship's resistance reducing apparatus 32 according to a third embodiment of the present invention.

As previously discussed, the point at which the fluid must be supplied to achieve the desired wave resistance reduction effect of the present invention may vary depending on the operating conditions. Accordingly, the guide channel 202 or the fluid outlet 302 of the present invention may include one or more joints 210 and 320.

The joints 210 and 320 provided in the guide passage 202 or the fluid outlet 302 can rotate in the longitudinal direction of the ship. Therefore, since the position of the fluid outlet 302 can be changed by rotation, it is possible to discharge the fluid to the changed position when the desired position is changed. At this time, in addition to changing the angle in the longitudinal direction by the joints 210 and 320, if the length of the guide passage 202 is variably adjusted, the fluid can be more accurately guided to a desired position.

7 is a side view showing a ship's resistance reducing apparatus 33 according to a fourth embodiment of the present invention.

It is possible to slide in the longitudinal direction of the hull 10 instead of using the joints 210 and 320 to move the fluid outlet 303 to a desired place. The pump 100 itself can slide or the guide channel 203 can slide to change the position of the fluid outlet 303 in the longitudinal direction of the hull 10. In this case, if the length of the guide passage 203 is variably adjusted in addition to the sliding movement, the fluid can be more accurately guided to a desired position.

8 is a side view showing a ship's resistance reducing apparatus 34 according to a fifth embodiment of the present invention.

In the first to fourth embodiments (30-33) of the present invention, the fluid discharge ports (300-303) are located near the target. However, in the apparatus for reducing resistance 34 of a ship according to the fifth embodiment of the present invention, the fluid discharge port 304 is provided at an upper portion of the ship 10 to allow the fluid to flow. Figure 10 shows the presence of the fluid outlet 304 in the upper front of the bow 11 but includes the placement of the fluid outlet 304 on both sides of the bow 11.

The hull 10 is streamlined to reduce the operating resistance. Accordingly, when the fluid is discharged around the upper portion of the bow 11, the fluid flows from the periphery of the bow bulb (X, see Fig. 2) to the osteolysis (Y, see Fig. 2) while flowing along the hull 10 .

In this case, as compared with the case where the fluid is supplied near the target, the effect of reducing the wave resistance can be reduced, but the configuration of the guide passage 204 is simplified. Therefore, the facility cost can be reduced and maintenance can be facilitated.

The ship's resistance reducing apparatus according to the embodiment of the present invention is necessary to reduce the wave resistance when it is not in the full load state or at the design speed and is therefore unnecessary when the ship is operated under the design conditions. In this case, if the ship's resistance reduction device can be stored onboard, it is safe from breakage and the maintenance cost is reduced. In addition, if there is a risk of breakage due to wave or the like, it is preferable to store it on a ship regardless of whether it is operated under design conditions.

For storage of the resistance reducing apparatus, the guide passage 200 is variable and may include the joints 210 and 320. The length of the guide channel 200 may be shortened and the joints 210 and 320 may be rotated to position and store the guide channel 200 and the fluid outlet 300 in a line. However, even when the guide passage 200 is not variable, it is possible to store the resistance reduction device by rotation of the joints 210 and 320. [

The guide passage 200 may be made of a rigid body, but is not limited thereto and may be a flexible tube. In this case, it is possible to position the guide passage 200 in close contact with the hull 10, and it is advantageous in that maintenance and storage are convenient.

Also, the guide passage 200 may include magnetism. Since the hull 10 contains the steel Fe, the magnetic object sticks to the hull 10. It is possible to prevent the guide passage 200 from being separated from the hull 10 in close contact with the hull 10 when the guide passage 200 contains magnetism. In this case, the resistance reducing device can be protected from an impact caused by shaking or the like of the hull 10, and it is also advantageous in reducing the operational resistance.

At this time, the magnetism may be temporarily removed for the purpose of removing or changing the position of the guide passage 200 for storage or the like.

The apparatus for reducing the resistance of a ship according to an embodiment of the present invention may include a control unit 400. The control unit 400 receives information on the speed or draft of the ship. Depending on the speed or draft of the ship, the surface waves may vary and the location, supply flow rate, or feed rate at which the fluid should be supplied may vary depending on various surface waves.

The control unit 400 may control the driving of the pump 100. [ The pump 100 may be controlled to vary the supply flow rate. If more energy is needed, that is, if the peak wave height is high, the flow rate can be increased, and if less energy is needed, the flow rate can be reduced to achieve the optimum wave resistance reduction effect in various situations.

The control unit 400 may control the speed adjuster 310. The energy of the fluid at the same flow rate can be varied by controlling the velocity of the fluid being discharged.

The control unit 400 can control the length or angle of the guide passage 200. The length or angle of the guide passage 200 can be adjusted so that the fluid outlet 300 can be positioned at a desired position. The control unit 400 can move the position of the fluid outlet 300 in the longitudinal direction of the hull 10 by allowing the pump 100 or the guide passage 200 to slide in the longitudinal direction of the hull 10, have.

10: Hull, 11: Player,
12: player bulb, 30-34: resistance reducing device,
100: pump, 200-204: guide passage,
210: joint, 300-304: fluid outlet,
310: speed regulator, 320: joint,
330: branch point, 400: control section

Claims (14)

A pump provided on the hull,
A guide channel having one end communicating with the pump and disposed outside the hull,
And a fluid outlet provided at the other end of the guide passage,
Wherein the guide passage is variable in position with respect to a waveform of a water surface wave depending on a loading state and a speed of the hull, and the fluid discharge port has a different position, and the fluid discharged through the fluid outlet is a water surface wave Guided by the osteolysis to reduce the wave resistance generated on the side of the hull,
Wherein the guide channel is variable in length. delete The method according to claim 1,
Wherein the guide channel guides the fluid downward along a side of the bow or the hull. The method according to claim 1,
Wherein the fluid outlet comprises a velocity regulator capable of regulating the velocity of the fluid to be discharged. The method according to claim 1,
The guide channel guides the fluid downward along the bow,
Wherein the fluid discharge port is branched to left and right sides of the bow to discharge fluid to both sides of the hull. delete The method according to claim 1,
Wherein the guide passage or the fluid outlet has one or more joints to adjust the angle in the longitudinal direction of the ship. A pump provided on the hull,
A guide channel having one end communicating with the pump and disposed outside the hull,
And a fluid outlet provided at the other end of the guide passage,
Wherein the guide passage is variable in position with respect to a waveform of a water surface wave depending on a loading state and a speed of the hull, and the fluid discharge port has a different position, and the fluid discharged through the fluid outlet is a water surface wave Guided by the osteolysis to reduce the wave resistance generated on the side of the hull,
Wherein the guide passage is slidable in the longitudinal direction of the hull. The method according to claim 1,
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 controller for receiving information on the speed of the ship or the draft of the ship and controlling the operation of the speed regulator. The method according to claim 1,
And a controller for receiving information on the speed of the ship or the draft of the ship and controlling the length of the guide passage. 9. The method of claim 8,
And a controller for receiving information on the speed of the ship or the draft of the ship and controlling the sliding motion of the guide passage. 12. A ship equipped with a resistance reducing device according to any one of claims 1, 3 to 5 and 7 to 12. 8. The method of claim 7,
And a control unit for receiving information on the speed of the ship or the draft of the ship and controlling the angles of the guide channel or the fluid discharge port.

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