Fluid resistance reduction device for ships

Abstract

The present invention relates to a fluid resistance reducing device for a ship, and more specifically, to a fluid resistance reducing device for a ship, which greatly reduces the friction resistance and wave resistance caused by seawater when the ship is sailing, thereby increasing the speed, and specifically realizing smooth sailing and fuel saving. According to the present invention, the fluid resistance reducing device is provided below the waterline of the hull, and can utilize the rotation of a propulsion propeller provided on the hull to introduce seawater from the bow part and discharge it to the rear of the stern while traveling, thereby greatly reducing the friction resistance and wave resistance of seawater, and thus the present invention shows that it can not only improve the navigation ability but also specifically realize the effect of increasing the speed and saving fuel.

Description

Technical Field

[0001] The present invention relates to a fluid resistance reducing device for a ship, and more specifically, to a fluid resistance reducing device for a ship, which greatly reduces the friction resistance and wave resistance caused by seawater when the ship is sailing, thereby increasing the speed and specifically realizing smooth sailing and saving fuel. Background Art

[0002] Generally speaking, a ship at sea is subjected to fluid resistance caused by seawater, i.e. friction resistance, and wave resistance due to waves generated on the water surface. In particular, friction resistance accounts for a large part of the water resistance borne by the hull, thus causing a large energy loss during navigation. At the same time, wave resistance also accounts for a part of the water resistance borne by the hull, thus causing a loss of propulsion and energy loss that increases fuel consumption. Therefore, research in the field of ship hulls has been devoted to developing hull shapes that can reduce friction resistance and wave resistance.

[0003] For example, various methods have been sought to reduce frictional resistance, such as reducing the friction coefficient by applying paint on the hull, reducing frictional resistance by spraying bubbles, or making the surface of the hull as smooth as a dolphin, but still no significant effect has been achieved.

[0004] In addition, as a representative example of reducing wave resistance, a bulbous object (bulb) protruding forward from the bow below the water surface is called a bulbous bow. The bulbous bow generates waves and can offset the waves caused by the bow to reduce the height of the waves generated on the bow side. Although wave resistance is reduced in this way, this bulbous bow is designed to produce the best effect under the condition that the ship is fully loaded and sailing at the design speed. Therefore, under actual sailing conditions where the full load draft and design speed are not maintained, it leads to an increase in wave resistance and there is a problem of increased hull length.

[0005] On the other hand, there are also various technologies proposed for reducing fluid resistance caused by seawater. For example, Japanese Patent Publication No. 2016-112950 (published on June 23, 2016) discloses a technology for forming water transfer tunnels on the starboard and port sides of a ship to allow seawater to pass through to reduce fluid resistance and enable hydroelectric power generation. However, the above technology is intended to generate hydroelectric power using fluid passing through the water transfer tunnel, and cannot reduce fluid resistance when the ship is sailing.

[0006] In addition, Korean Utility Model Publication No. 20-2010-0004331 discloses a technology that reduces the hydraulic pressure on the bow side of a sailing ship and increases the propulsion force on the stern side by introducing seawater as a hydraulic pressure on the bow side through a water intake and discharging it from the stern side at high pressure. Although this technology has the effect of increasing the propulsion force, it is not enough to reduce the friction resistance and wave resistance generated in the traveling direction of the ship when the ship is sailing.

[0007] In addition, Korean patent publication 10-2015-0047812 discloses a ballast-free system for a ship, which forms a seawater channel in the ship. When the ship stops or initially sails, the rotator in the seawater channel helps the seawater to flow quickly through electric rotation operation, thereby keeping the ship balanced. The seawater channel only provides the effect of keeping the ship balanced. It can be said that the seawater channel is a technology that cannot reduce friction resistance and wave resistance.

[0008] Therefore, the actual situation is that there is an urgent need to develop a technology that is relatively simple in structure and can improve the efficiency of reducing friction resistance and wave resistance. Summary of the invention

[0009] Technical issues

[0010] The present invention has been developed to solve the above-mentioned problems, and its purpose is to provide a fluid resistance reducing device for a ship, which guides seawater to flow along the direction of travel of the ship when the ship is sailing, thereby greatly reducing the friction resistance caused by collision with the ship and the wave resistance generated by waves, thereby not only increasing the speed but also realizing smooth sailing and saving fuel.

[0011] Problem Solving Solutions

[0012] In order to achieve the above object, the present invention provides a fluid resistance reducing device for a ship, characterized in that it comprises:

[0013] A deformed V-shaped or U-shaped fluid guide plate is provided on the outer bottom of the hull of a ship having a propulsion propeller at the stern in a state of being wrapped along the shape of the hull and arranged at a certain distance from the outer bottom of the hull to form a fluid conveying channel;

[0014] The fluid inlet of the fluid guide plate is formed on the bow side of the hull in a manner protruding toward the traveling direction of the ship;

[0015] The fluid outlet of the fluid guide plate is formed on the stern side of the hull; and

[0016] a fluid delivery channel connecting a fluid inlet and a fluid outlet,

[0017] The above-mentioned fluid discharge port is formed in a shape whose inner diameter is reduced due to an arc-shaped curved plate added on the inner side of the fluid guide plate in a relative manner and gradually expands toward the end to the same size as the fluid inlet. The propulsion propeller is arranged in the above-mentioned reduced inner diameter portion, and the seawater that is forcibly introduced by the rotational force of the propulsion propeller is quickly discharged through the fluid discharge port that gradually expands toward the end to the same size as the fluid inlet.

[0018] Effects of the Invention

[0019] According to the present invention as described above, the fluid resistance reducing device is provided below the waterline of the hull, and can utilize the rotation of the propulsion propeller provided on the hull to introduce seawater from the bow part and discharge it behind the stern while traveling, thereby greatly reducing the friction resistance and wave resistance of the seawater. Therefore, the present invention has the effect of not only improving the navigation capability but also specifically realizing the effect of increasing speed and saving fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an exemplary perspective view showing a fluid resistance reducing device for a ship and a ship equipped with the device according to an embodiment of the present invention.

[0021] Figure 2 This is a side view showing a fluid resistance reducing device for a ship and a ship equipped with the device according to an embodiment of the present invention.

[0022] Figure 3 yes Figure 2 “AA” line section view.

[0023] Figure 4 This is a schematic plan view of a fluid resistance reducing device for a ship and a ship equipped with the device according to an embodiment of the present invention.

[0024] Figure 5 This is a schematic side view showing the operating relationship of a ship equipped with a fluid resistance reducing device for a ship according to one embodiment of the present invention. DETAILED DESCRIPTION

[0025] The fluid resistance reducing device for a ship according to the present invention will be described in more detail below with reference to the accompanying drawings.

[0026] Before proceeding with the explanation, it should be reminded that the terms or words used in this specification and claims should not be interpreted limited to the usual meaning or the meaning in the dictionary, but should be based on the principle that the inventor can accurately define the concept of the term in order to explain his own invention in the best way, and should be interpreted as the meaning and concept consistent with the technical idea of ​​the present invention.

[0027] Therefore, the one embodiment described in this specification and the structure illustrated in the accompanying drawings are merely the most ideal embodiment of the present invention and do not fully represent the technical concept of the present invention. Therefore, at the time of this application, it should be understood that there are various equivalents and modifications that can replace them.

[0028] Figure 1 is an exemplary perspective view showing a fluid resistance reducing device for a ship according to an embodiment of the present invention and a ship equipped with the device. Figure 2 is a side view showing a fluid resistance reducing device for a ship and a ship equipped with the device according to an embodiment of the present invention, Figure 3 yes Figure 2 The "AA" line section view, Figure 4 is a schematic top view of a fluid resistance reducing device for a ship and a ship equipped with the device according to an embodiment of the present invention, Figure 5 This is a schematic side view showing the operating relationship of a ship equipped with a fluid resistance reducing device for a ship according to one embodiment of the present invention.

[0029] like Figures 1 to 5 As shown, the fluid resistance reducing device of the ship of the present invention is constructed to include: a deformed V-shaped or U-shaped fluid guide plate 50, which is arranged on the outer bottom of the hull 10 in a state of being wrapped along the shape of the hull 10 and at a certain interval from the outer bottom of the hull 10; a fluid inlet 51 of the above-mentioned fluid guide plate 50, which is formed on the bow 10a side of the hull 10; a fluid outlet 52 of the above-mentioned fluid guide plate 50, which is formed on the stern 10b side of the hull 10; and a fluid conveying channel 53, which connects the fluid inlet 51 and the fluid outlet 52.

[0030] The above-mentioned fluid guide plate 50 has a length corresponding to the length of the hull 10. The fluid inlet 51 and the fluid outlet 52 are formed to introduce and discharge seawater when the ship 100 is sailing. In order to minimize the resistance of seawater while increasing the introduction and discharge amounts, the fluid inlet 51 on the bow 10a side has a width corresponding to the width of the hull 10 and is formed to protrude in the traveling direction of the ship. The fluid outlet 52 formed on the stern 10b side and formed to discharge the seawater introduced through the above-mentioned fluid inlet 51 to the rear is formed in a shape whose inner diameter is reduced due to the arc-shaped curved plate 52a added in a relative manner on the inner side of the fluid guide plate 50 and gradually expands toward the end to the same size as the fluid inlet 51.

[0031] On the other hand, the propulsion propeller 11 provided on the stern 10b side is located inside the above-mentioned fluid discharge port 52 to propel the above-mentioned hull 10, especially in the narrow inner diameter portion between the arc-shaped curved plates 52a of the above-mentioned fluid discharge port 52, and the seawater is forcibly introduced and discharged through the rotational force of the propulsion propeller. The forced introduced seawater is quickly discharged through the fluid discharge port which gradually widens toward the end to the same size as the fluid inlet.

[0032] Therefore, the propulsion propeller is preferably provided close to the narrow inner diameter portion.

[0033] The fluid conveying channel 53 is a conveying pipe formed inside to guide the seawater introduced into the fluid inlet 51 to the fluid outlet 52 for discharge, and the fluid conveying channel 53 is formed across the entire bottom of the hull 10 submerged in water.

[0034] In this way, the fluid inlet 51, the fluid outlet 52 and the fluid delivery channel 53 formed by the fluid guide plate 50 are a kind of fluid delivery pipeline for the introduction and outflow of fluid when the ship 100 is sailing. It is preferably formed in an "I" shape. Needless to say, it can also be named as a nozzle or a pipeline. Regardless of its expression or shape, it is constructed to introduce the fluid that generates resistance from the bow 10a side and discharge it to the rear of the stern 10b side.

[0035] On the other hand, Figure 2 As shown, the fluid guide plate 50 composed of the above-mentioned fluid inlet 51, fluid outlet 52 and fluid delivery channel 53 is formed into a V-shape or U-shape deformed in a manner of wrapping the surface of the ship side 10c and the bottom 10d below the waterline 12, which is the limit of being submerged in water.

[0036] Hereinafter, the operational relationship according to the navigation of the ship 100 equipped with the fluid resistance reducing device of the ship 100 of the present invention will be described.

[0037] Figure 5 1 is a schematic side view showing the working relationship of a ship 100 equipped with a fluid resistance reducing device of the ship 100 according to a preferred embodiment of the present invention. Referring to the attached figure, the lower part of the waterline 12 of the hull 10 is submerged in water, and the fluid resistance reducing device composed of the fluid guide plate 50 of the present invention is also submerged in water. In this state, if the propulsion propeller 11 is rotated to make the hull 10 move forward, in the process that seawater flows from the bow 10a side of the hull 10 through the fluid guide plate 50 of the present invention into the fluid inlet 51 protruding in the traveling direction and is discharged from the fluid outlet 52 on the stern 10b side, the fluid that collides with the bow 10a and generates resistance is discharged to the stern 10b side, thereby reducing the resistance of the fluid.

[0038] In other words, if the propulsion propeller 11 inside the fluid discharge port 52 of the fluid resistance reducing device is rotated to make the ship sail, it can specifically achieve the effect that the seawater in front of the bow 10a side flows in through the fluid inlet 51 protruding in the direction of travel of the fluid guide plate 50, then flows through the fluid delivery channel 53 and is forcibly discharged to the rear of the stern 10b through the fluid discharge port 52, thereby greatly reducing the resistance of the fluid along the direction of travel of the hull 10.

[0039] In particular, the fluid inlet 51 formed on the bow 10a side of the fluid deflector 50 is formed to be wide with a width corresponding to the width of the hull 10 and is formed to protrude in the moving direction of the ship, so that the fluid colliding with the bow 10a when the ship 100 is moving is contained and discharged to the fluid discharge port 52 through the fluid delivery channel 53 before acting on the hull as resistance, thereby being able to attenuate friction resistance and wave resistance.

[0040] In addition, the above-mentioned fluid deflector 50 is in a form of wrapping the surface of the side 10c and the bottom 10d of the ship below the waterline 12 of the hull 10. Therefore, the seawater stored in the fluid delivery channel 53 of the fluid deflector 50 can perform the ballast water function of the hull 10, thereby also obtaining an effect of being able to provide a greater sense of stability during navigation.

[0041] In summary, the fluid resistance reducing device composed of the fluid guide plate 50 is provided below the waterline 12 of the hull 10, and can utilize the rotation of the propulsion propeller 11 provided on the hull 10 to introduce seawater from the bow 10a part and discharge it to the rear of the stern 10b while moving forward, thereby minimizing the push of the fluid caused by the movement of the hull. When the propulsion speed is close to the fluid discharge amount due to acceleration, the fluid located in the moving direction of the hull acts as a pedal for the screw push rather than a resistance, so the density of the fluid acts in a favorable way for the propulsion of the ship, thereby greatly reducing the friction resistance and wave resistance of the seawater. Therefore, the present invention is a useful invention that can not only improve the navigation capability but also specifically realize the effects of increasing speed and saving fuel.

Claims

1. A fluid resistance reduction device for a ship, characterized in that: include: A V-shaped or U-shaped fluid guide plate (50) is submerged below the waterline (12) and deformed in a manner to wrap around the surface of the side (10c) and the bottom (10d) of the ship, and is arranged on the outer bottom of the hull (10) of a ship (100) having a propulsion propeller (11) at the stern (10b) in a state of wrapping along the shape of the hull (10) and at a certain distance from the outer bottom of the hull (10) to form a fluid conveying channel (53); The fluid inlet (51) of the fluid guide plate (50) is formed to be wide in width corresponding to the width of the hull (10) and is formed on the bow (10a) side of the hull (10) in a manner protruding in the traveling direction of the ship; The fluid outlet (52) of the fluid guide plate (50) is formed on the stern (10b) side of the hull (10); and a fluid delivery channel (53) connecting the fluid inlet (51) and the fluid outlet (52), The fluid delivery channel (53) is formed on the outer bottom and the entire bottom surface of the hull (10). The fluid discharge port (52) is formed in a shape in which its inner diameter is reduced due to an arc-shaped curved plate (52a) which is relatively added to the inner side of the fluid guide plate (50) and surrounds the entire propulsion propeller (11), and gradually expands toward the rear end to the same size as the fluid inlet (51). The propulsion propeller (11) is arranged in the reduced inner diameter portion, and the seawater forcibly introduced by the rotational force of the propulsion propeller (11) is quickly discharged through the fluid discharge port which gradually expands toward the rear end to the same size as the fluid inlet.

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