KR20140046603A - Rudder having asymmetry wavy profile and ship with the same - Google Patents

Rudder having asymmetry wavy profile and ship with the same Download PDF

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Publication number
KR20140046603A
KR20140046603A KR1020120111472A KR20120111472A KR20140046603A KR 20140046603 A KR20140046603 A KR 20140046603A KR 1020120111472 A KR1020120111472 A KR 1020120111472A KR 20120111472 A KR20120111472 A KR 20120111472A KR 20140046603 A KR20140046603 A KR 20140046603A
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KR
South Korea
Prior art keywords
rudder
ship
sides
profile
asymmetry
Prior art date
Application number
KR1020120111472A
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Korean (ko)
Inventor
윤현식
정재환
김미정
Original Assignee
부산대학교 산학협력단
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Priority to KR1020120111472A priority Critical patent/KR20140046603A/en
Publication of KR20140046603A publication Critical patent/KR20140046603A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/06—Steering by rudders
    • B63H25/38—Rudders
    • B63H25/382—Rudders movable otherwise than for steering purposes; Changing geometry
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/06—Steering by rudders
    • B63H25/38—Rudders
    • B63H2025/388—Rudders with varying angle of attack over the height of the rudder blade, e.g. twisted rudders

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

The present invention relates to a ship rudder with an asymmetrical wavy profile and a ship including the same, which can restrict separation of seawater flow to reduce stall delay, increase a lift force, and thus improve steering performance, as well as minimizing generation of vortex and remarkably reducing vortex induced vibration (VIV) and vortex induced noise (VIN). A front end of the rudder has a profile of a wavy form which is alternately provided with valleys and ridges. The region extending from the valley to the ridges protruding from both sides of the valley is in an asymmetric form, so that the flow of the seawater is converged with different speed boundary layers on the basis of the valley.

Description

Rudder having asymmetry wavy profile and ship with the same}

The present invention relates to a rudder for ships, in particular, by limiting the separation of the seawater flow by the unique configuration having an asymmetric wave profile, to delay stall and increase the lift force to improve the adjustment performance, while minimizing the occurrence of unnecessary vortex The present invention relates to a ship rudder having a profile with an asymmetric waveform which greatly reduces vortex induced vibration (VIV) and vortex induced noise (VIN), and a vessel having the same.

In general, the term "ta" refers to a device used to control a ship.

Such a ride may be installed on the hull of the hull but is installed behind the propeller 20 at the rear of the hull 10 as shown in FIG. 1.

As such, the ship rudder 30 is installed at the rear of the propeller 20, thus causing interference with the flow from the propeller 20, which has a negative effect on the overall propulsion performance.

In addition, as the lift 30 is required to have a sufficient lift force in the direction change is required during the voyage of the ship, the design of the rudder 30 flows to improve the overall performance of the propeller 20 and the steering performance of the vessel. It should be made in the direction of increasing the lift by reducing the phenomena at the low angle of attack and having a low resistance to. To this end, studies are underway to reconsider the performance of the rudder 30 by using the shape deformation and additives of the rudder 30.

However, these studies have been conducted by trial-and-error method based on intuition based on experience, and recently, the study of applying the tube shape of the whale fin to improve the performance of the airfoil and the blade has been partially conducted. It was. The nodular shape of the whale fin is almost in line with the study of evaluating the effect on the resistance of an object by corrugating the tip of a blunt object in the field of hydrodynamics. Patent Publication No. 2010-0048540 can be referred to as "wave rudder and a ship provided with the same". In the `` corrugated rudder and the ship with the same '' of the Korean Patent Publication No. 2010-0048540, the other drag decreases due to the inflow, the lifting force is increased, and the stall phenomenon is formed by forming a wave shaped surface shape at the tip of the rudder. A delay was made.

However, in the case of the rudder having a wave-shaped surface shape as shown in FIG. 2, compared to the traditional rudder 30 which was formed only in a flat streamline from the front end 30a to the rear end 30b, the rudder due to inflow flow Despite the advantages of reduced drag, increased lift and stall stalling, there was still a need for improvement. In particular, there is an urgent need for measures that can greatly reduce Vortex Induced Vibration (VIV) and Vortex Induced Noise (VIN) while minimizing the occurrence of unnecessary vortices.

Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to delay stalling and increase lift by limiting peeling of seawater flow by a unique configuration having an asymmetric wave profile. Ship's rudder with an asymmetric waveform profile that significantly reduces vortex induced vibration (VIV) and vortex induced noise (VIN) while minimizing the generation of unnecessary vortices. To provide a ship equipped.

In order to achieve the above object, the ship rudder according to the technical idea of the present invention, in the rudder for ships installed vertically in the rear of the propeller at the rear of the hull, the bottom portion and the peak portion in the vertical direction is repeatedly formed along the vertical direction It has a profile of, but the asymmetric intervals from the bottom to the ridges protruding on both sides of the bottom is asymmetrical, so that the flow of seawater around the bottom converges with different velocity boundary layers. It is characterized by technical configuration.

Here, in order to achieve the asymmetry, the protruding heights of the protrusions located on both sides of the bottom are the same, and the distances from the bottom to the protrusions located on both sides of the protrusions are different from each other.

Further, in order to achieve the asymmetry, the protruded heights of the protrusions located on both sides of the bottom are different from each other, and the distances from the bottom to the protrusions located on both sides of the protrusions are the same.

Further, in order to achieve the asymmetry, the protruding heights of the protrusions located on both sides of the bottom are different from each other, and distances from the bottom to the protrusions located on both sides of the protrusions are different from each other.

In addition, the thickness is gradually thinner from the other end portion to the rear end portion, the asymmetric waveform profile of the tip portion may be characterized in that the curved surface.

In addition, the other end portion region is formed in the protruding portion extending from the peak portion to the left side and the right side further formed, the recessed portion having a concave shape compared to the protrusion is formed between the protrusion and the protrusion is spaced apart It can be characterized as being able to guide the flow of sea water.

On the other hand, the ship which concerns on this invention is equipped with the above-mentioned ship rudder, It is characterized by the technical configuration.

In accordance with the present invention, a ship rudder and a ship having the same have a profile of an asymmetric waveform formed at the tip of the rudder to limit the separation of seawater flow, thereby delaying stalling, increasing lift, and reducing the shape resistance by allowing the flow to flow along the shape of the rudder. The overall performance of the other is significantly improved.

In addition, the present invention has the effect of greatly reducing the vortex induced vibration (VIV) and vortex induced noise (VIN) while minimizing the occurrence of flow resistance and unnecessary vortex. In addition, it is possible to reduce the fatigue and corrosion of the structure by reducing the cavitation (cavitation) phenomenon.

1 is an installation state of the other rudder for ship according to the prior art.
Figure 2 is a perspective view for explaining the structure of the rudder according to the prior art.
3 is a view showing the use state of the ship and the ship provided with the same according to an embodiment of the present invention.
Figures 4a and 4b is a 3D model of a ship rudder and a ship having the same according to an embodiment of the present invention.
5 is a perspective view of a rudder for ship according to an embodiment of the present invention.
Figure 6 is a front view for explaining the configuration of the rudder for ship according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing a state of use of a ship rudder and a ship having the same according to an embodiment of the present invention, Figures 4a and 4b is a 3D model of the ship rudder and the ship according to the embodiment of the present invention.

As shown, the rudder 100 for the ship according to the embodiment of the present invention is installed perpendicular to the rear of the propeller 20 at the rear of the hull 10 performs a function of controlling the direction of the ship while rotating left and right. .

The ship rudder 100 according to the embodiment of the present invention has an asymmetric wave profile 110 at its distal end, including an increase in lift force and a decrease in drag force caused by inflow flowing from the propeller 20. The stall phenomenon is delayed. In addition, it significantly reduces vortex induced vibration (VIV) and vortex induced noise (VIN) and minimizes cavitation, while minimizing flow resistance and unnecessary vortices. Corrosion can be reduced.

Hereinafter, the configuration of the rudder 100 for ship according to an embodiment of the present invention will be described in more detail.

5 is a perspective view of a ship rudder according to an embodiment of the present invention, Figure 6 is a front view for explaining the configuration of the ship rudder according to the embodiment of the present invention.

As shown, the rudder 100 for ship according to the embodiment of the present invention is installed perpendicular to the rear of the propeller 20 at the rear of the hull 10, the bottom portion 111 along the vertical direction to the front end portion (100a) ) And the peaks 112 and 113 are formed repeatedly, and the sections extending from the bottoms 111 to the peaks 112 and 113 located on both sides of the bottom portion 111 are asymmetric (except for explanation). For convenience of the following, each of the hills 112 and 113 located on both sides of the bottom 111 will be divided into a first hill 112 and a second hill 113 to be described).

In order to form asymmetrically the sections leading to the first crest 112 and the second crest 113 on both sides with the bottom 111 as the center as described above, A first distance D1 from the bottom 111 to the first crest 112 and a second distance D1 from the bottom 111 to the crest 112 and the second crest 113 are the same, And the second distance D2 leading to the second end 113 may be different.

Here, looking at the profile 110 of the asymmetric waveform, the distance between the first mountain 112 and the second mountain 113 corresponds to the period (L1) and the first mountain 112 and the second mountain 113 of The height divided by the protruding height corresponds to the amplitude (L2 / 2).

In addition, looking at the cross section of the ship rudder 100 according to an embodiment of the present invention becomes thinner gradually from the front end portion (100a) to the rear end portion (100b) regardless of the cord length to reach the rear end portion (100b) very thin Make it thick. However, the tip portion 100a and the profile 110 formed on the tip portion 100a are also curved, and the bottom portion 111, the first hill 112, and the second hill 113 are also curved.

According to the configuration of the ship rudder 100 having the asymmetric wave profile 110 as described above, from the first peak portion 112 and the second peak portion 113 formed to the maximum height in the profile 110 of the asymmetric wave shape to the lowest height This leads to the development of the boundary layer of seawater flow moving to the formed bottom 111, where the first and second peaks 112 and 113 located on both sides of the bottom 111 are asymmetric. The flows moving from the first peak 112 and the second peak 113 to the bottom 111 respectively have different velocity boundary layers. Accordingly, flows having different velocity boundary layers converge at the bottom portion 111 to generate a strong vortex, which delays the stall phenomenon due to inflow of seawater and minimizes flow resistance and unnecessary vortex generation It plays a role of suppressing delaying the point of separation, Vortex Induced Vibration, and Vortex Induced Noise.

It should be noted that a strong vortex is generated at the bottom 111 of the rudder 100 for ships due to the above-described reason, which does not increase vortex vibration and vortex noise but rather suppresses it. Unlike the case of strong vortex formed at the bottom 111 of the asymmetric corrugated profile 110, it is generated due to the separation of the flow around the marine structure and then abruptly disappears, causing pressure change and vibration and noise This is because there is no vortex shedding phenomenon and rather suppresses the formation of a vortex having such a shedding phenomenon.

In addition, the first protruding portion 112a and the second protruding portion 113a extending from the first mountain portion 112 and the second mountain portion 113 to protrude from the first mountain portion 112 and the second mountain portion 113 to the left side and the right side, respectively, in the area of the other tip portion 100a of the ship. ) Is further formed. As a result, between the first protrusion 112a and the second protrusion 113a, the recessed part 111a having a recessed shape is formed between the first protrusion 112a and the second protrusion 113a. do.

Thus, according to the configuration in which the first protrusion 112a, the second protrusion 113a, and the recess 111a are formed, the seawater strongly flowing out of the propeller 20 is guided to move along the surface shape of the rudder 100. The possibility of unnecessary vortices at the rear of the 100 is further reduced.

The asymmetric waveform profile 110 according to the embodiment of the present invention is asymmetrical with respect to the first peak 112 and the second peak 113 protruding from both sides of the bottom 111 Some variations are possible while maintaining the basic form.

For example, according to the foregoing description with reference to FIGS. 5 to 6, the protrusions of the first and second mountain parts 112 and 113 positioned on both sides of the bottom part 111 in order to achieve asymmetry. The height is the same, and the distance from the bottom part 111 to the first mountain part 112 and the second mountain part 113 located on both sides thereof is characterized by being formed differently. On the other hand, however, the protruding heights of the first and second mountain parts 112 and 113 located on both sides of the bottom part 111 are different from each other, and the first and second parts located on both sides from the bottom part 111 are different. The distances to the first mountain 112 and the second mountain 113 may be formed equal to each other.

In order to achieve the asymmetry, the protruded heights of the first hill 112 and the second hill 113 located on both sides of the first hill 111 are different from each other, The distance to the first crest 112 and the distance to the second crest 113 may be different from each other.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be suitably modified and applied in the same manner. Therefore, the above description does not limit the scope of the present invention, which is defined by the limitations of the following claims.

100: rudder for ship 111: bottom
112: first mountain part 113: second mountain part
112a and 113a: protrusion 111a: recessed part

Claims (7)

In the rudder of the ship installed perpendicular to the rear of the propeller at the rear of the hull,
The front end is provided with a profile in the form of a wave formed repeatedly the bottom and the peak along the vertical direction, the section leading to the peak located in the protruding form on both sides of the bottom is asymmetrical,
The vessel for the ship, characterized in that the flow of sea water around the bottom to converge with different velocity boundary layer. The method of claim 1,
In order to achieve the asymmetry, the protruding height of the peaks located on both sides of the bottom portion is the same, and the distance from the bottom portion to the peaks located on both sides is different from each other. The method of claim 1,
In order to achieve the asymmetry, the protruding height of the mountain parts located on both sides of the bottom portion are different from each other, and the distance from the bottom portion to the mountain parts located on both sides thereof is the same. The method of claim 1,
In order to achieve the asymmetry, the protruding height of the mountain parts located on both sides with respect to the bottom part is different from each other, and the distance from the bottom part to the mountain parts located on both sides is different from each other. The method of claim 1,
A rudder for ships, characterized in that the thickness becomes thinner gradually from the tip of the rudder to the rear end, but the asymmetric wave profile of the tip is formed in a curved surface. 6. The method of claim 5,
The other distal end region protrudes from the peak and extends to the left side and the right side, and a protrusion is formed between the protrusion and the protrusion, and a recessed portion having a concave shape compared to the protrusion is formed. Other ships, characterized in that to guide the flow. Ship provided with the rudder of any one of Claims 1-6.
KR1020120111472A 2012-10-08 2012-10-08 Rudder having asymmetry wavy profile and ship with the same KR20140046603A (en)

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KR1020120111472A KR20140046603A (en) 2012-10-08 2012-10-08 Rudder having asymmetry wavy profile and ship with the same

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Application Number Priority Date Filing Date Title
KR1020120111472A KR20140046603A (en) 2012-10-08 2012-10-08 Rudder having asymmetry wavy profile and ship with the same

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105840426A (en) * 2016-03-18 2016-08-10 杭州电子科技大学 Elastic rod vortex-induced vibration wind power generation device
CN110920850A (en) * 2019-12-12 2020-03-27 哈尔滨工程大学 Promote propulsive efficiency's wave rudder for boats and ships

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105840426A (en) * 2016-03-18 2016-08-10 杭州电子科技大学 Elastic rod vortex-induced vibration wind power generation device
CN110920850A (en) * 2019-12-12 2020-03-27 哈尔滨工程大学 Promote propulsive efficiency's wave rudder for boats and ships

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