WO2021040090A1 - Rudder for ship, comprising rudder bulb - Google Patents

Rudder for ship, comprising rudder bulb Download PDF

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Publication number
WO2021040090A1
WO2021040090A1 PCT/KR2019/011063 KR2019011063W WO2021040090A1 WO 2021040090 A1 WO2021040090 A1 WO 2021040090A1 KR 2019011063 W KR2019011063 W KR 2019011063W WO 2021040090 A1 WO2021040090 A1 WO 2021040090A1
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Prior art keywords
rudder
propeller
bulb
ship
protruding
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PCT/KR2019/011063
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French (fr)
Korean (ko)
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최권호
홍춘범
박윤용
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(주)디에이취엠씨
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Priority to PCT/KR2019/011063 priority Critical patent/WO2021040090A1/en
Publication of WO2021040090A1 publication Critical patent/WO2021040090A1/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

Definitions

  • the present invention relates to a rudder for a ship including a ruther bulb, and more particularly, it includes a ruther bulb protruding in the propeller direction, and the upper and lower front ends are formed alternately with respect to the ruther bulb to increase the propulsion efficiency of the ship. It relates to a rudder for a ship including a rutherbulb.
  • a ship in general, includes a thruster that generates a thrust force and a rudder that adjusts the moving direction of the ship using thrust generated from the thruster.
  • the rudder has an angle of attack according to the flow of water, the vertical component of the lift acting on it is used as the forward force to adjust the direction of the ship.
  • the rudder is installed to be rotatable with respect to the hull and plays a role of adjusting the moving direction of the ship by changing the action direction of the propulsive force generated from the propeller of the propeller.
  • the propulsion of a ship uses only about 70% of the power generated by the main engine as propulsion to advance the ship, and the power of the remaining engines is propeller friction, heat loss and rotational flow at the rear of the propeller, propeller hub vortex. Wasted on the back.
  • the rotational flow of the rear of the propeller and the hub vortex correspond to about 5 to 7% and 1 to 3% of the power, and the strong hub vortex generates hub vortex cavitation to generate noise, vibration, and rudder. Since it causes problems such as erosion and corrosion, various devices have been conventionally developed and applied to ships in order to solve the problems caused by the recovery and cavitation of wasted energy.
  • Cavitation is due to the influence of tip vortex cavitation and hub vortex cavitation generated by the propeller, and the influence of the rudder's own cavitation occurring in the rudder by increasing the flow velocity of the incident flow or increasing the angle of incidence.
  • Damage caused by cavitation is mainly caused by tip vortex cavitation from the propeller, damage to the upper part of the rudder, damage to the middle part of the rudder due to hub vortex cavitation, and in special cases due to cavitation of the rudder itself. It can be divided into damage to the lower end of the rudder and damage to the lower end due to sole cavitation.
  • the shape of the rudder is changed, or a special coating that absorbs the impact caused by cavitation is applied to the surface of the rudder, and the space where cavitation occurs is covered.
  • a hump-shaped rudder bulb is attached to the rudder.
  • the pressure distribution generated in the rudder by the propeller rotating in a clockwise direction has a pressure surface formed in the upper left and lower right of the rudder, and the suction surface is formed in the upper right and lower left of the rudder. Is formed.
  • the rudder of a ship equipped with a high-speed or high-load thruster has a symmetric cross section due to the asymmetrical pressure distribution characteristic of the rudder surface, erosion damage due to cavitation occurs in the rudder part formed by the suction surface.
  • the front end of the upper and lower ends of the rudder around the axis of the propeller are deflected to correspond to the direction of the rotational incidence (upstream) caused by the rotation of the propeller.
  • the rudder is being developed.
  • the present invention is to solve the above problems, and a rutherbulb is mounted or formed to reduce hub vortex cavitation, while improving the turning performance during course maintenance or direction change of the ship to reduce the rotation radius of the ship. It is intended to provide a rudder for a ship including a rudder bulb in which the upper and lower front ends of the rudder are alternately deflected to correspond to the pressure distribution formed by the propeller rotating in the direction.
  • the rudder for a ship including the rudder bulb of the present invention for achieving the above object is installed at the rear of the ship at the rear of the propeller and rotated along the rotational direction of the rudder stock mounted at the aft of the ship to adjust the moving direction of the ship.
  • the front end side facing the propeller is deflected in the rotational incident flow direction of the propeller.
  • a lower rudder part positioned below the upper rudder part and formed to be staggered on a front end side of the upper rudder with the rudder stock as a center so that a front end side facing the propeller faces a direction opposite to the rotation direction of the propeller;
  • a rudder bulb protruding in the propeller direction between a lower portion of the rudder portion and an upper portion of the lower rudder portion.
  • the rudder bulb has a cylindrical bulb body part extending to the same diameter as the cap of the propeller between the lower part of the rudder part and the upper part of the lower rudder part, and a hemispherical shape protruding from the end of the bulb body part in the direction of the cap of the propeller. It is preferable to have a bulb head portion facing the cap of the propeller.
  • the front end portion of the upper rudder part is formed to be twisted in a curved shape in a direction away from the axial line of the propeller so that the front end part extends vertically downward from the top and the lower part contacts one side of the outer circumferential surface of the rudder bulb.
  • the front end of the rudder is preferably formed to be twisted in a curved shape in a direction away from the axis line so that the front end of the rudder extends vertically upward and the upper part contacts the other side of the outer circumferential surface of the rudder bulb.
  • the rudder body portion has a diameter protruding from both sides of the upper rudder and the lower rudder for laminar flow of the rotational incident flow, so that the rotational incident flow flowing into one side of the upper rudder can be laminarized.
  • the protruding side goes rearward, the protruding side is deflected upwardly away from the axial line of the propeller, and the other side protruded so that the rotational incident flow flowing into the other side of the lower rudder can be laminarized. It is preferable that it is formed to be deflected downwardly away from each other.
  • the rudder for ships including the rudder bulb of the present invention is formed with a rudder bulb to reduce the occurrence of cavitation by the propeller hub, while the upper and lower front ends are deflected in opposite directions to correspond to the flow of the rotating incident flow. As it is easy to move, there is an advantage of reducing the propulsion efficiency and fuel of the ship.
  • Figure 3 is a front view of the ship rudder of Figure 1
  • FIG. 4 is a front view of a rudder for a ship including a ruther bulb according to a second embodiment of the present invention
  • FIG. 5 is a perspective view of a rudder for a ship including a ruther bulb according to a third embodiment of the present invention
  • Figure 6 is a side view showing one side of the ship rudder of Figure 5
  • FIG. 7 is a side view showing the other side of the ship rudder of FIG. 5.
  • FIG. 8 is a front view of a rudder for a ship including a ruther bulb according to a fourth embodiment of the present invention.
  • the rudder for a ship is installed at the rear of the ship at the rear of the propeller 5 to adjust the moving direction of the ship, and the front part is curved in order to minimize the resistance of the fluid, and it is formed in a sharp streamline shape toward the rear end. .
  • rudders for ships extend in the vertical direction and are combined with the lower part of the rudder stock 3, which is rotatably mounted by the steering gear at the rear of the ship, and rotates along the rotational direction of the rudder stock 3 to determine the moving direction of the ship. do.
  • the rudder stock 3 and the steering gear mounted to control the ship's rudder are general components that determine the direction of the ship, and detailed descriptions thereof will be omitted.
  • the pressure distribution generated in the ship's rudder by the propeller (5) rotating in a clockwise direction forms a pressure surface in the upper left and lower right of the rudder, and the suction surface in the upper right and lower left of the rudder. Is formed.
  • the rudder of a ship equipped with a high-speed or high-load thruster has a symmetric cross section due to the asymmetrical pressure distribution characteristic of the rudder surface, erosion damage due to cavitation occurs at the portion of the rudder where the suction surface is formed.
  • FIG. 1 to 3 illustrate a rudder 10 for a ship including a rudder bulb according to a first embodiment of the present invention.
  • the high-performance rudder 10 for a ship takes into account the pressure distribution due to the rotational incident flow generated by the rotation of the propeller and the cavitation generated at the hub side of the propeller. It is configured to reduce the propeller (5) to increase the propulsion efficiency.
  • the high-performance rudder 10 for a ship exemplifies that a propeller 5 rotated to provide propulsion to the ship is rotated in a clockwise direction.
  • the high-performance rudder 10 for a ship includes an upper rudder part 11 and a lower rudder part 16 disposed vertically around the axis line (a) of the propeller, and an upper rudder part ( A rudder bulb 21 protruding in the direction of the propeller 5 is provided between the 11) and the lower rudder 16.
  • the upper rudder part 11 is formed in a streamline shape having the widest width on the side on which the rudder stock 3 is mounted.
  • the upper rudder part 11 is formed in a direction opposite to the rotational direction of the propeller so that the front end 12 side facing the propeller 5 is deflected in the direction of rotational incidence so as to reduce resistance to the rotational incident flow. .
  • the lower rudder unit 16 extends downward from the lower end of the upper rudder unit 11 and is formed in a streamline shape having the widest width on the side on which the rudder stock 3 is mounted.
  • the lower rudder unit 16 is a rudder stock toward a direction opposite to the rotational direction of the propeller so that the front end 17 side facing the propeller 5 is deflected in the rotational incident flow direction so as to reduce the resistance to the rotational incident flow. It is formed alternately on the front end side of the upper rudder part 11 around (3).
  • the front side of the upper rudder part 11 is deflected to the upper left of the propeller 5, and the lower rudder part 16 has the front end of the propeller 5 The front end side is deflected to the lower right based on the axis line.
  • the rudder bulb 21 protrudes in the propeller direction between the lower part of the rudder part 11 and the upper part of the lower rudder part 16, and the center of the rudder bulb 21 protrudes to coincide with the axial line of the propeller.
  • the ruther bulb 21 includes a bulb body portion 22 and a bulb head portion 26.
  • the bulb body part 22 has the same diameter as the cap 7 of the propeller 5 so as to reduce the hub vortex cavitation between the lower part of the upper rudder part 11 and the upper part of the lower rudder part 16. It extends in a cylindrical shape in the direction.
  • the bulb head portion 26 faces the cap 7 of the propeller 5 in the direction of the cap 7 of the propeller 5 at the end of the bulb body portion 22.
  • the bulb head portion 26 is formed in a hemispherical shape to reduce the occurrence of eddy currents when the fluid moved to the end of the cap 7 moves to the bulb body portion 22.
  • the rudder for ships 10 including the rudder bulb according to the first embodiment of the present invention has a rudder bulb 21 formed to reduce the occurrence of cavitation at the center of the propeller 5, while preventing the flow of rotating incident flow.
  • the upper and lower front ends are deflected in opposite directions, so that the fluid can be easily moved, thereby reducing the propulsion efficiency and fuel of the ship.
  • FIG. 4 shows a rudder 110 for a ship including a ruther bulb according to a second embodiment of the present invention.
  • the rudder for a ship 110 including the rudder bulb according to the second embodiment of the present invention is a rudder according to the first embodiment of the present invention except for the shapes of the front ends of the upper rudder part 111 and the lower rudder part 116. It is the same as the structure of the ship's rudder 10 including a bulb.
  • the front end 112 of the upper rudder part 111 extends vertically downward from the top, and the lower part is in contact with one side of the outer circumferential surface of the rudder bulb 21 on the axial line of the propeller 5 It is formed to be twisted in a curved shape in the outward direction, which is a direction away from (a).
  • the front end 117 of the lower rudder part 116 extends in a vertical upward direction from the bottom and the upper part is in an outer direction that is away from the axis line (a) so that the upper part contacts the other side of the outer circumferential surface of the rudder bulb 21 It is formed to be twisted in a curved shape.
  • the fluid flows through the outer circumferential surface of the rudder bulb 21 by the shape of each front end of the upper rudder part 111 and the lower rudder part 116.
  • the formation of vortex can be further reduced.
  • FIGS. 5 to 7 a rudder 210 for a ship including a rudder bulb according to a third embodiment of the present invention is shown.
  • a ship rudder 210 including a rudder bulb according to the third embodiment of the present invention is the same as the structure of the ship rudder 10 according to the first embodiment of the present invention except for the shape of the rudder bulb 221.
  • the rudder bulb 221 has a diameter protruding to both sides with respect to each side of the upper rudder part 11 and the lower rudder part 16 at a position where the rudder stock 3 is mounted for laminar flow of rotational incident flow.
  • the rudder bulb 221 includes a bulb head portion 26 and a bulb body portion 222, and the bulb body portion 222 includes an upper rudder portion 11 and a lower rudder portion.
  • the main body portion 223 extending with the same diameter as the cap 7 in the direction of the propeller 5 with respect to the front end of 16, and the upper rudder portion 11 extending rearward from the main body portion 223 It includes a laminar flow induction part 225 protruding to both sides with respect to the lower rudder part 16.
  • the laminar flow induction part 225 protrudes from one side 11a of the upper rudder 11 and is rearward so that the rotational incident flow flowing into the one side 11a of the upper rudder 11 can be laminarized.
  • the first laminar flow unit 226 deflected upwardly away from the axial line (a) of the propeller 5 and the rotational incident flow flowing into the other side (16b) of the lower rudder unit 16 can be laminarized.
  • it has a second laminar flow portion 228 formed to protrude from the other side (16b) of the lower rudder portion (16) and deflect downwardly to be further away from the axial line (a) of the propeller (5). .
  • one side of the laminar flow induction part 225 is formed to be deflected upward toward the rear end, and the other side is formed to be deflected downward toward the rear end.
  • the rudder for a ship 210 including the rudder bulb according to the third embodiment of the present invention is formed by the laminar flow induction part 225 of the rudder bulb formed in an asymmetric shape on both sides, Since the rotational incident flow that is generated obliquely from the bottom to the top is induced to become laminar, there is an advantage that cavitation can be reduced and the propulsive power of the ship can be improved.
  • FIG. 8 shows a rudder 310 for a ship including a ruther bulb according to a fourth embodiment of the present invention.
  • a ship rudder 310 including a rudder bulb according to the third embodiment of the present invention is the same as the structure of the ship rudder 10 according to the first embodiment of the present invention except for the shape of the rudder bulb 321.
  • the rudder bulb 321 has a diameter protruding to both sides with respect to each side of the upper rudder part 11 and the lower rudder part 16 at a position where the rudder stock 3 is mounted for laminar flow of rotational incident flow.
  • the rudder bulb 321 includes a bulb head portion 26 and a bulb body portion 322, and the bulb body portion 322 includes an upper rudder portion 11 and a lower rudder portion 16.
  • the front end of the main body portion 223 extending in the same diameter as the cap 7 in the direction of the propeller 5, and extending rearward from the main body portion 223, the upper rudder portion 11 and the lower rudder portion It has a laminar flow induction part 325 protruding to both sides with respect to (16).
  • the laminar flow induction unit 325 is formed to be symmetrical on both sides such that the center sides of both rear ends are located on the axis (a), and includes a lower laminar flow induction unit 326 and an upper laminar flow induction unit 328.
  • the lower laminar flow induction part 326 protrudes from one side of the upper rudder part 11 and the lower rudder part 16, but the cross section is convex downward so that the protruding length with respect to the lower rudder part 16 increases as it goes downward. Is formed.
  • the lower laminar flow induction part 326 has one side 16a of the lower rudder part 16 having a higher curvature than the other side 16b of the lower rudder part 16 as the front end 17 of the lower rudder part 16 is deflected. ) To induce laminar flow of the fluid flowing backwards.
  • the upper laminar flow induction part 328 protrudes from the other side of the upper rudder part 11 and the lower rudder part 16, but the cross section is convex so that the protruding length with respect to the upper rudder part 11 increases as it goes upward. Is formed.
  • the upper laminar flow induction part 328 is the other side 11b of the upper rudder part 11 having a higher curvature than the one side 11a of the upper rudder part 11 as the front end 12 of the upper rudder part 11 is deflected. ) To induce laminar flow of the fluid flowing backwards.
  • the lower laminar flow induction part 326 and the upper laminar flow induction part 328 are preferably formed to protrude toward both sides than the main body part 223 as shown in FIG. 8, and from the end of the main body part 223 to the rear. It is preferable that the length protruding from the main body portion 223 gradually extends gradually so as to extend in a curved shape with the main body portion 223.
  • the upper laminar flow induction part and the lower laminar flow induction part of the rudder bulb 321 protrude in an asymmetric shape, so that the upper rudder part 11 has a large curvature. It is possible to secure a greater amount of laminar flow of the fluid flowing along the side surface 16a having a large curvature of the other side 11b and the lower rudder unit 16, so that the driving force may be improved.

Abstract

The present invention relates to a rudder for a ship, comprising a rudder bulb and, more specifically, to a rudder for a ship, comprising a rudder bulb, the rudder comprising a rudder bulb that protrudes in the direction of a propeller, and capable of increasing the propulsion efficiency of a ship as the front upper part and the front lower part of the rudder are formed to cross each other with the rudder bulb at the center. The rudder for a ship, comprising a rudder bulb of the present invention can decrease the occurrence of cavitation due to a propeller hub by having the rudder bulb, and has the benefit of saving the fuel and propelling efficiency of the ship by enabling easy movement of fluid by having the upper part and the lower part of a front part tilted in crossing directions to correspond to a rotational incident flow.

Description

러더벌브를 포함하는 선박용 방향타Marine rudder with rutherbulb
본 발명은 러더벌브를 포함하는 선박용 방향타에 관한 것으로서, 더욱 상세하게는 프로펠러 방향으로 돌출된 러더벌브를 포함하며 러더벌브를 기준으로 전단 상부와 전단 하부가 엇갈리게 형성되어 선박의 추진효율을 높일 수 있는 러더벌브를 포함하는 선박용 방향타에 관한 것이다. The present invention relates to a rudder for a ship including a ruther bulb, and more particularly, it includes a ruther bulb protruding in the propeller direction, and the upper and lower front ends are formed alternately with respect to the ruther bulb to increase the propulsion efficiency of the ship. It relates to a rudder for a ship including a rutherbulb.
일반적으로 선박은, 추진력을 발생시키는 추진기와, 추진기로부터 발생된 추진력을 이용하여 선박의 진행 방향을 조정하는 러더(rudder, 방향타)를 포함한다. 이러한 러더는 물의 흐름에 따른 받음각을 가질 때 여기에 작용하는 양력의 수직 성분을 회두력으로 이용하여 선박의 진행 방향을 조정하는 원리로 동작된다.In general, a ship includes a thruster that generates a thrust force and a rudder that adjusts the moving direction of the ship using thrust generated from the thruster. When the rudder has an angle of attack according to the flow of water, the vertical component of the lift acting on it is used as the forward force to adjust the direction of the ship.
따라서 러더는 선체에 대해 회전 가능하게 설치되어 추진기의 프로펠러로부터 발생된 추진력의 작용방향을 변경하여 선박의 진행 방향을 조정하는 역할을 한다.Therefore, the rudder is installed to be rotatable with respect to the hull and plays a role of adjusting the moving direction of the ship by changing the action direction of the propulsive force generated from the propeller of the propeller.
최근 선박이 대형화되고 고속화됨에 따라 프로펠러에서 발생하는 후류(slip stream)는 매우 높은 하류 방향 속도를 갖게 되었고 이러한 후류에 의해 직접적으로 영향을 받게 되는 러더는 양력이나 항력뿐만 아니라 캐비테이션(cavitation, 공동현상) 관점에서 많은 관심을 불러일으키고 있다.As ships have become larger and faster in recent years, the slip stream generated by the propeller has a very high downstream speed, and the rudder that is directly affected by this wake is not only lift or drag, but also cavitation (cavitation). It is arousing a lot of interest from the point of view.
일반적으로, 선박의 추진기는 주엔진에서 발생하는 동력의 약 70% 정도만 선박을 전진시키는 추진력으로 사용하며, 나머지 엔진의 동력은 프로펠러 마찰, 열 손실 및 프로펠러 후방의 회전류, 프로펠러 허브 볼텍스(hubvortex) 등으로 낭비된다.In general, the propulsion of a ship uses only about 70% of the power generated by the main engine as propulsion to advance the ship, and the power of the remaining engines is propeller friction, heat loss and rotational flow at the rear of the propeller, propeller hub vortex. Wasted on the back.
이 중, 프로펠러 후방의 회전류와 허브 볼텍스는 동력의 약 5 ~ 7% 및 1 ~ 3%에 해당하며, 또한, 강한 허브 볼텍스는 허브 볼텍스 캐비테이션(hub vortex cavitation)을 생성하여 소음 및 진동, 러더의 침식과 부식과 같은 문제점을 야기 시키므로, 이와 같이 낭비되는 에너지의 회수와 캐비테이션에 의해 야기되는 문제점을 해결하기 위하여, 다양한 장치가 종래부터 개발되어 선박에 적용되어 왔다.Among them, the rotational flow of the rear of the propeller and the hub vortex correspond to about 5 to 7% and 1 to 3% of the power, and the strong hub vortex generates hub vortex cavitation to generate noise, vibration, and rudder. Since it causes problems such as erosion and corrosion, various devices have been conventionally developed and applied to ships in order to solve the problems caused by the recovery and cavitation of wasted energy.
캐비테이션은, 프로펠러에 의해 발생되는 팁 볼텍스(tip vortex) 캐비테이션과 허브 볼텍스(hub vortex) 캐비테이션에 의한 영향과, 입사류의 유속 증가 또는 입사각의 증가에 의해 러더에서 발생하는 러더 자체 캐비테이션의 영향 등으로 구분될 수 있으며, 캐비테이션에 의한 손상은 주로 프로펠러로부터 발생하는 팁 볼텍스(tipvortex) 캐비테이션에 의해 러더의 상부 손상, 허브 볼텍스(hub vortex) 캐비테이션에 의한 러더의 중간 부분손상, 특별한 경우 러더 자체 캐비테이션 등에 의한 러더의 하부 손상 및 소울(sole) 캐비테이션에 의한 하부 끝단 부분 손상으로 구분될 수 있다.Cavitation is due to the influence of tip vortex cavitation and hub vortex cavitation generated by the propeller, and the influence of the rudder's own cavitation occurring in the rudder by increasing the flow velocity of the incident flow or increasing the angle of incidence. Damage caused by cavitation is mainly caused by tip vortex cavitation from the propeller, damage to the upper part of the rudder, damage to the middle part of the rudder due to hub vortex cavitation, and in special cases due to cavitation of the rudder itself. It can be divided into damage to the lower end of the rudder and damage to the lower end due to sole cavitation.
이와 같은 캐비테이션에 의한 영향을 최대한 줄여 선박의 조종 성능을 향상시키기 위한 일환으로 러더의 형상을 바꾸거나, 캐비테이션으로 발생하는 충격을 흡수하는 특수코팅을 러더의 표면에 입히기도 하며, 캐비테이션이 일어나는 공간을 최소화하기 위해 러더에 혹 모양의 러더 벌브(rudder bulb)를 결합시킨다.In order to improve the ship's maneuverability by minimizing the effects of such cavitation, the shape of the rudder is changed, or a special coating that absorbs the impact caused by cavitation is applied to the surface of the rudder, and the space where cavitation occurs is covered. To minimize this, a hump-shaped rudder bulb is attached to the rudder.
한편, 선박의 후방에서 바라볼 때, 시계방향으로 회전하는 프로펠러에 의해 방향타에서 발생하는 압력분포는 방향타의 좌측 상부와 우측 하부에 압력면이 형성되고, 방향타의 우측 상부와 좌측하부에서는 흡입면이 형성된다.On the other hand, when viewed from the rear of the ship, the pressure distribution generated in the rudder by the propeller rotating in a clockwise direction has a pressure surface formed in the upper left and lower right of the rudder, and the suction surface is formed in the upper right and lower left of the rudder. Is formed.
이러한 방향타 면의 비대칭 압력분포 특성으로 인하여 고속 또는 고부하 추진기를 장착한 선박의 방향타가 좌우 대칭 단면을 갖는 다면, 흡입면이 형성하는 방향타의 부위에서 캐비테이션에 의한 침식손상이 발샐된다.If the rudder of a ship equipped with a high-speed or high-load thruster has a symmetric cross section due to the asymmetrical pressure distribution characteristic of the rudder surface, erosion damage due to cavitation occurs in the rudder part formed by the suction surface.
이와 같은 방향타의 캐비테이션 침식 손상을 최소화 시키기 위하여 프로펠러의 축선을 중심으로 방향타의 상부와 하부의 전단부를 프로펠러의 회전에 의한 회전입사류(후류) 방향에 대응되게 편향되도록 일정각도 비틀린 형상으로 형성한 비대칭 방향타가 개발되고 있다. In order to minimize such cavitation erosion damage of the rudder, the front end of the upper and lower ends of the rudder around the axis of the propeller are deflected to correspond to the direction of the rotational incidence (upstream) caused by the rotation of the propeller. The rudder is being developed.
이와 같이, 캐비테이션을 줄일 수 있으면서, 선박의 추진력을 높일 수 있는 구조가 개발되고 있으나, 보다 경제적이면서 운용의 효율성을 높일 수 있는 복합적인 구조가 요구되고 있다.As described above, a structure capable of reducing cavitation and increasing the propulsive power of a ship has been developed, but a complex structure that is more economical and can increase operational efficiency is required.
본 발명은 상기와 같은 문제점을 해결하기 위한 것으로서, 러더벌브가 장착 또는 형성되어 허브 볼텍스 캐비테이션을 줄일 수 있으면서 선박의 침로유지 또는 방향 전환시 선회 성능을 향상시켜 선박의 회전반경을 줄일 수 있도록, 시계방향으로 회전하는 프로펠러에 의해 형성되는 압력분포에 대응되게 방향타의 상부와 하부의 전단부가 엇갈리게 편향된 러더벌브를 포함하는 선박용 방향타를 제공하고자 한다.The present invention is to solve the above problems, and a rutherbulb is mounted or formed to reduce hub vortex cavitation, while improving the turning performance during course maintenance or direction change of the ship to reduce the rotation radius of the ship. It is intended to provide a rudder for a ship including a rudder bulb in which the upper and lower front ends of the rudder are alternately deflected to correspond to the pressure distribution formed by the propeller rotating in the direction.
상기와 같은 목적을 달성하기 위한 본 발명의 러더벌브를 포함하는 선박용 방향타는 선박의 후미에 프로펠러의 후방에 설치되어 상기 선박의 후미에 장착되는 러더스톡의 회전방향을 따라 회전되어 상기 선박의 이동방향을 조정하는 것으로서, 회전되는 상기 프로펠러의 회전에 의해 발생되는 회전 입사류에 대한 저항을 줄여 상기 프로펠러의 추진효율을 높일 수 있도록, 상기 회전 입사류 방향으로 편향되게 상기 프로펠러와 마주하는 전단측이 상기 프로펠러의 회전방향에 반대되는 방향을 향하는 상부러더부와; 상기 상부러더부의 하방에 위치되며, 상기 프로펠러와 마주하는 전단측이 상기 프로펠러의 회전방향에 반대되는 방향을 향하도록 상기 러더스톡을 중심으로 상기 상부러더의 전단측에 엇갈리게 형성되는 하부러더부와; 상기 상기러더부의 하부와 상기 하부러더부의 상부 사이에서 상기 프로펠러 방향으로 돌출된 러더벌브를 구비하는 것을 특징으로 한다.The rudder for a ship including the rudder bulb of the present invention for achieving the above object is installed at the rear of the ship at the rear of the propeller and rotated along the rotational direction of the rudder stock mounted at the aft of the ship to adjust the moving direction of the ship. In order to increase the propulsion efficiency of the propeller by reducing the resistance to the rotational incident flow generated by the rotation of the rotating propeller, the front end side facing the propeller is deflected in the rotational incident flow direction of the propeller. An upper rudder portion facing a direction opposite to the rotation direction; A lower rudder part positioned below the upper rudder part and formed to be staggered on a front end side of the upper rudder with the rudder stock as a center so that a front end side facing the propeller faces a direction opposite to the rotation direction of the propeller; And a rudder bulb protruding in the propeller direction between a lower portion of the rudder portion and an upper portion of the lower rudder portion.
상기 러더벌브는 상기 상기러더부의 하부와 상기 하부러더부의 상부 사이에서 상기 프로펠러의 캡과 동일한 직경으로 연장된 원통형상의 벌브본체부와, 상기 벌브본체부의 단부에서 상기 프로펠러의 캡 방향으로 반구형상으로 돌출되어 상기 프로펠러의 캡과 마주하는 벌브헤드부를 구비하는 것이 바람직하다.The rudder bulb has a cylindrical bulb body part extending to the same diameter as the cap of the propeller between the lower part of the rudder part and the upper part of the lower rudder part, and a hemispherical shape protruding from the end of the bulb body part in the direction of the cap of the propeller. It is preferable to have a bulb head portion facing the cap of the propeller.
상기 상부러더부의 전단부는 상부에서 하방으로 수직하방으로 연장되다 하부가 상기 러더벌브의 외주면의 일측부로 접하도록 상기 프로펠러의 축선상에 대해 멀어지는 방향인 외측방향으로 곡선형태로 비틀어지게 형성되며, 상기 하부러더의 전단부는 하부에서 수직상방으로 연장되다 상부가 상기 러더벌브의 외주면의 타측부로 접하도록 상기 축선상에 대해 멀어지는 방향인 외측방향으로 곡선형태로 비틀어지게 형성되는 것이 바람직하다.The front end portion of the upper rudder part is formed to be twisted in a curved shape in a direction away from the axial line of the propeller so that the front end part extends vertically downward from the top and the lower part contacts one side of the outer circumferential surface of the rudder bulb. The front end of the rudder is preferably formed to be twisted in a curved shape in a direction away from the axis line so that the front end of the rudder extends vertically upward and the upper part contacts the other side of the outer circumferential surface of the rudder bulb.
상기 러더본체부는 회전입사류의 층류화를 위하여 상기 상부러더부와 상기 하부러더부에 대해 양측으로 돌출되는 직경을 가지되, 상기 상부러더부의 일측면으로 유입되는 회전입사류를 층류화 할 수 있도록 돌출된 일측부가 후방으로 갈수록 상기 프로펠러의 축선상에 대해 멀어지게 상방측으로 편향되고, 상기 하부러더부의 타측면으로 유입되는 회전입사류를 층류화 할 수 있도록돌출된 타측부는 후방으로 갈수록 상기 축선상에 대해 멀어지게 하방측으로 편향되게 형성되는 것이 바람직하다.The rudder body portion has a diameter protruding from both sides of the upper rudder and the lower rudder for laminar flow of the rotational incident flow, so that the rotational incident flow flowing into one side of the upper rudder can be laminarized. As the protruding side goes rearward, the protruding side is deflected upwardly away from the axial line of the propeller, and the other side protruded so that the rotational incident flow flowing into the other side of the lower rudder can be laminarized. It is preferable that it is formed to be deflected downwardly away from each other.
본 발명의 러더벌브를 포함하는 선박용 방향타는 러더벌브가 형성되어 있어 프로펠러 허브에 의한 캐비테이션 발생을 줄일 수 있으면서, 회전입사류의 흐름에 대응되게 전단부 상부와 하부가 엇갈리는 방향으로 편향되어 있어 유체의 이동이 용이함에 따라 선박의 추진효율 및 연료를 절감할 수 있는 이점이 있다.The rudder for ships including the rudder bulb of the present invention is formed with a rudder bulb to reduce the occurrence of cavitation by the propeller hub, while the upper and lower front ends are deflected in opposite directions to correspond to the flow of the rotating incident flow. As it is easy to move, there is an advantage of reducing the propulsion efficiency and fuel of the ship.
선박용 방향타에 대한 측면도이고, It is a side view of a ship's rudder,
도 3은 도 1의 선박용 방향타에 대한 정면도이고,Figure 3 is a front view of the ship rudder of Figure 1,
도 4는 본 발명의 제2실시 예에 따른 러더벌브를 포함하는 선박용 방향타에 대한 정면도이고,4 is a front view of a rudder for a ship including a ruther bulb according to a second embodiment of the present invention,
도 5는 본 발명의 제3 실시 예에 따른 러더벌브를 포함하는 선박용 방향타에 대한 사시도이고,5 is a perspective view of a rudder for a ship including a ruther bulb according to a third embodiment of the present invention,
도 6은 도 5의 선박용 방향타의 일측면을 도시한 측면도이고,Figure 6 is a side view showing one side of the ship rudder of Figure 5,
도 7은 도 5의 선박용 방향타의 타측면을 도시한 측면도이다.7 is a side view showing the other side of the ship rudder of FIG. 5.
도 8은 본 발명의 제4실시 예에 따른 러더벌브를 포함하는 선박용 방향타에 대한 정면도이다.8 is a front view of a rudder for a ship including a ruther bulb according to a fourth embodiment of the present invention.
이하, 첨부된 도면을 참조하여 본 발명에 따른 러더벌브를 포함하는 선박용 방향타를 상세하게 설명한다.Hereinafter, a rudder for a ship including a ruther bulb according to the present invention will be described in detail with reference to the accompanying drawings.
일반적으로 선박용 방향타는 선박의 후미에 프로펠러(5)의 후방에 설치되어 선박의 이동방향을 조정하는 것으로서, 유체의 저항을 최소한으로 하기 위하여 앞부분이 곡선으로 형성되고, 후단으로 갈수록 뾰족한 유선형상으로 형성된다.In general, the rudder for a ship is installed at the rear of the ship at the rear of the propeller 5 to adjust the moving direction of the ship, and the front part is curved in order to minimize the resistance of the fluid, and it is formed in a sharp streamline shape toward the rear end. .
이러한 선박용 방향타는 상하방향으로 연장되며 선박의 후미에서 스티어링기어에 의해 회전가능하게 장착되는 러더스톡(3)의 하부와 결합되어 러더스톡(3)의 회전방향을 따라 회전되어 선박의 진행방향을 결정한다.These rudders for ships extend in the vertical direction and are combined with the lower part of the rudder stock 3, which is rotatably mounted by the steering gear at the rear of the ship, and rotates along the rotational direction of the rudder stock 3 to determine the moving direction of the ship. do.
선박용 방향타를 조종하기 위해 장착되는 러더스톡(3) 및 스티어링 기어는 선박의 방향을 결정하는 일반적인 구성요소로서 자세한 설명은 생략한다.The rudder stock 3 and the steering gear mounted to control the ship's rudder are general components that determine the direction of the ship, and detailed descriptions thereof will be omitted.
선박의 후방에서 볼 때, 시계방향으로 회전하는 프로펠러(5)에 의해 선박용 방향타에서 발생하는 압력분포는 방향타의 좌측 상부와 우측 하부에 압력면이 형성되고, 방향타의 우측상부와 좌측 하부에서는 흡입면이 형성된다.When viewed from the rear of the ship, the pressure distribution generated in the ship's rudder by the propeller (5) rotating in a clockwise direction forms a pressure surface in the upper left and lower right of the rudder, and the suction surface in the upper right and lower left of the rudder. Is formed.
이러한 방향타 면의 비대칭 압력 분포 특성으로 인하여 고속 또는 고부하 추진기를 장착한 선박의 방향타가 좌우 대칭 단면을 갖는다면, 흡입면이 형성되는 방향타의 부위에서 캐비테이션에 의한 침식 손상이 발생된다.If the rudder of a ship equipped with a high-speed or high-load thruster has a symmetric cross section due to the asymmetrical pressure distribution characteristic of the rudder surface, erosion damage due to cavitation occurs at the portion of the rudder where the suction surface is formed.
도 1 내지 도 3에는 본 발명의 제1실시 예에 따른 러더벌브를 포함하는 선박용 방향타(10)가 도시되어 있다.1 to 3 illustrate a rudder 10 for a ship including a rudder bulb according to a first embodiment of the present invention.
본 발명의 제1 실시 예에 따른 선박용 고성능 방향타(10)는 프로펠러의 회전에 의해 발생하는 회전 입사류에 의한 압력분포와 프로펠러의 허브 측에서 발생되는 캐비테이션을 고려한 것으로서, 회전 입사류에 대한 저항을 줄여 프로펠러(5)의 추진효율을 높일 수 있도록 구성된 것이다.The high-performance rudder 10 for a ship according to the first embodiment of the present invention takes into account the pressure distribution due to the rotational incident flow generated by the rotation of the propeller and the cavitation generated at the hub side of the propeller. It is configured to reduce the propeller (5) to increase the propulsion efficiency.
본 발명의 제1실시 예에 따른 선박용 고성능 방향타(10)는 선박에 추진력을 제공하기 위해 회전되는 프로펠러(5)가 시계방향으로 회전되는 것을 예로 들고 있다.The high-performance rudder 10 for a ship according to the first embodiment of the present invention exemplifies that a propeller 5 rotated to provide propulsion to the ship is rotated in a clockwise direction.
본 발명의 제1 실시 예에 따른 선박용 고성능 방향타(10)는 프로펠러의 축 선상(a)을 중심으로 상하로 배치되는 상부러더부(11)와 하부러더부(16), 그리고, 상부러더부(11)와 하부러더(16) 사이에 프로펠러(5) 방향으로 돌출 형성된 러더벌브(21)를 구비한다.The high-performance rudder 10 for a ship according to the first embodiment of the present invention includes an upper rudder part 11 and a lower rudder part 16 disposed vertically around the axis line (a) of the propeller, and an upper rudder part ( A rudder bulb 21 protruding in the direction of the propeller 5 is provided between the 11) and the lower rudder 16.
상부러더부(11)는 러더스톡(3)이 장착되는 측의 폭이 가장 넓은 유선형상으로 형성된다. 상부러더부(11)는 회전입사류에 대한 저항을 줄일 수 있도록 프로펠러(5)와 마주하는 전단부(12) 측이 회전입사류 방향으로 편향되게 프로펠러의 회전방향에 반대되는 방향으로 형성되어 있다.The upper rudder part 11 is formed in a streamline shape having the widest width on the side on which the rudder stock 3 is mounted. The upper rudder part 11 is formed in a direction opposite to the rotational direction of the propeller so that the front end 12 side facing the propeller 5 is deflected in the direction of rotational incidence so as to reduce resistance to the rotational incident flow. .
하부러더부(16)는 상부러더부(11)의 하단에서 하방으로 연장되며 러더스톡(3)이 장착되는 측의 폭이 가장 넓은 유선형상으로 형성된다. 하부러더부(16)는 회전입사류에 대한 저항을 줄일 수 있도록 프로펠러(5)와 마주하는 전단부(17) 측이 회전입사류 방향으로 편향되게 프로펠러의 회전방향에 반대되는 방향을 향해 러더스톡(3)을 중심으로 상부러더부(11)의 전단 측에 엇갈리게 형성된다. The lower rudder unit 16 extends downward from the lower end of the upper rudder unit 11 and is formed in a streamline shape having the widest width on the side on which the rudder stock 3 is mounted. The lower rudder unit 16 is a rudder stock toward a direction opposite to the rotational direction of the propeller so that the front end 17 side facing the propeller 5 is deflected in the rotational incident flow direction so as to reduce the resistance to the rotational incident flow. It is formed alternately on the front end side of the upper rudder part 11 around (3).
즉, 선박의 후방에서 볼 때, 상부러더부(11)는 프로펠러(5)의 축 선상을 기준으로 전단측이 좌측 상부로 편향되고, 하부러더부(16)는 전단측이 프로펠러(5)의 축 선상을 기준으로 전단측이 우측 하부로 편향된다.That is, when viewed from the rear of the ship, the front side of the upper rudder part 11 is deflected to the upper left of the propeller 5, and the lower rudder part 16 has the front end of the propeller 5 The front end side is deflected to the lower right based on the axis line.
러더벌브(21)는 상기러더부(11)의 하부와 하부러더부(16)의 상부 사이에서 프로펠러 방향으로 돌출되되, 중심이 프로펠러의 축선상과 일치되게 돌출 형성된다.The rudder bulb 21 protrudes in the propeller direction between the lower part of the rudder part 11 and the upper part of the lower rudder part 16, and the center of the rudder bulb 21 protrudes to coincide with the axial line of the propeller.
러더벌브(21)는 벌브본체부(22)와, 벌브헤드부(26)를 구비한다. The ruther bulb 21 includes a bulb body portion 22 and a bulb head portion 26.
벌브본체부(22)는 상부러더부(11)의 하부와 하부러더부(16)의 상부 사이에서 허브 볼텍스 캐비테이션을 줄일 수 있도록 프로펠러(5)의 캡(7)과 동일한 직경으로 프로펠러(5) 방향으로 원통 형상으로 연장된다.The bulb body part 22 has the same diameter as the cap 7 of the propeller 5 so as to reduce the hub vortex cavitation between the lower part of the upper rudder part 11 and the upper part of the lower rudder part 16. It extends in a cylindrical shape in the direction.
벌브헤드부(26)는 벌브본체부(22)의 단부에서 프로펠러(5)의 캡(7) 방향으로 프로펠러(5)의 캡(7)과 마주한다. 벌브헤드부(26)는 캡(7)의 단부로 이동된 유체가 벌브본체부(22)로 이동시 와류 발생을 줄일 수 있도록 반구형상으로 형성된다.The bulb head portion 26 faces the cap 7 of the propeller 5 in the direction of the cap 7 of the propeller 5 at the end of the bulb body portion 22. The bulb head portion 26 is formed in a hemispherical shape to reduce the occurrence of eddy currents when the fluid moved to the end of the cap 7 moves to the bulb body portion 22.
본 발명의 제1 실시 예에 따른 러더벌브를 포함하는 선박용 방향타(10)는 러더벌브(21)가 형성되어 있어 프로펠러(5)의 중심 측에 캐비테이션 발생을 줄일 수 있으면서, 회전입사류의 흐름에 대응되게 전단부 상부와 하부가 엇갈리는 방향으로 편향되어 있어 유체의 이동이 용이함에 따라 선박의 추진효율 및 연료를 절감할 수 있는 이점이 있다.The rudder for ships 10 including the rudder bulb according to the first embodiment of the present invention has a rudder bulb 21 formed to reduce the occurrence of cavitation at the center of the propeller 5, while preventing the flow of rotating incident flow. Correspondingly, the upper and lower front ends are deflected in opposite directions, so that the fluid can be easily moved, thereby reducing the propulsion efficiency and fuel of the ship.
한편, 도 4에는 본 발명의 제2실시 예에 따른 러더벌브를 포함하는 선박용 방향타(110)가 도시되어 있다. Meanwhile, FIG. 4 shows a rudder 110 for a ship including a ruther bulb according to a second embodiment of the present invention.
본 발명의 제2실시 예에 따른 러더벌브를 포함하는 선박용 방향타(110)는 상부러더부(111)와 하부러더부(116)의 전단부의 형상을 제외하고 본 발명의 제1 실시 예에 따른 러더벌브를 포함하는 선박용 방향타(10)의 구조와 동일하다.The rudder for a ship 110 including the rudder bulb according to the second embodiment of the present invention is a rudder according to the first embodiment of the present invention except for the shapes of the front ends of the upper rudder part 111 and the lower rudder part 116. It is the same as the structure of the ship's rudder 10 including a bulb.
도 4를 참고하면, 상부러더부(111)의 전단부(112)는 상부에서 하방으로 수직하향 방향으로 연장되다 하부가 러더벌브(21)의 외주면의 일측부로 접하도록 프로펠러(5)의 축선상(a)에 대해 멀어지는 방향인 외측방향으로 곡선형태로 비틀어지게 형성된다.4, the front end 112 of the upper rudder part 111 extends vertically downward from the top, and the lower part is in contact with one side of the outer circumferential surface of the rudder bulb 21 on the axial line of the propeller 5 It is formed to be twisted in a curved shape in the outward direction, which is a direction away from (a).
그리고, 하부러더부(116)의 전단부(117)는 하부에서 수직상향 방향으로 연장되다 상부가 러더벌브(21)의 외주면의 타측부로 접하도록 축선상(a)에 대해 멀어지는 방향인 외측 방향으로 곡선형태로 비틀어지게 형성된다.In addition, the front end 117 of the lower rudder part 116 extends in a vertical upward direction from the bottom and the upper part is in an outer direction that is away from the axis line (a) so that the upper part contacts the other side of the outer circumferential surface of the rudder bulb 21 It is formed to be twisted in a curved shape.
본 발명의 제2실시 예에 따른 러더벌브를 포함하는 선박용 방향타(110)는 상부러더부(111)와 하부러더부(116)의 각 전단부의 형상에 의해 유체가 러더벌브(21)의 외주면을 타고 상부러더부(111)와 하부러더부(116)의 전단부 측으로 이동되는 시 와류 형성이 보다 저감될 수 있는 이점이 있다.In the rudder for a ship 110 including a rudder bulb according to the second embodiment of the present invention, the fluid flows through the outer circumferential surface of the rudder bulb 21 by the shape of each front end of the upper rudder part 111 and the lower rudder part 116. When moving to the front end side of the upper rudder part 111 and the lower rudder part 116 while riding, there is an advantage that the formation of vortex can be further reduced.
한편, 도 5 내지 도 7에는 본 발명의 제3실시 예에 따른 러더벌브를 포함하는 선박용 방향타(210)가 도시되어 있다.Meanwhile, in FIGS. 5 to 7, a rudder 210 for a ship including a rudder bulb according to a third embodiment of the present invention is shown.
본 발명의 제3실시 예에 따른 러더벌브를 포함하는 선박용 방향타(210)는 러더벌브(221)의 형상을 제외하고 본 발명의 제1실시 예에 따른 선박용 방향타(10)의 구조와 동일하다.A ship rudder 210 including a rudder bulb according to the third embodiment of the present invention is the same as the structure of the ship rudder 10 according to the first embodiment of the present invention except for the shape of the rudder bulb 221.
러더벌브(221)는 회전입사류의 층류화를 위하여 러더스톡(3)이 장착되는 위치의 상부러더부(11)와 하부러더부(16)의 각 면 대해 양측으로 돌출되는 직경을 갖는다.The rudder bulb 221 has a diameter protruding to both sides with respect to each side of the upper rudder part 11 and the lower rudder part 16 at a position where the rudder stock 3 is mounted for laminar flow of rotational incident flow.
도 5 내지 도 7을 참고하면, 러더벌브(221)는 벌브헤드부(26)와, 벌브본체부(222)를 구비하며, 벌브본체부(222)는 상부러더부(11)와 하부러더부(16)의 전단부에 대해 프로펠러(5) 방향으로 캡(7)과 동일한 직경으로 연장된 메인본체부(223)와, 메인본체부(223)에서 후방으로 연장되어 상부러더부(11)와 하부러더부(16)에 대해 양측으로 돌출된 층류화유도부(225)를 구비한다.5 to 7, the rudder bulb 221 includes a bulb head portion 26 and a bulb body portion 222, and the bulb body portion 222 includes an upper rudder portion 11 and a lower rudder portion. The main body portion 223 extending with the same diameter as the cap 7 in the direction of the propeller 5 with respect to the front end of 16, and the upper rudder portion 11 extending rearward from the main body portion 223 It includes a laminar flow induction part 225 protruding to both sides with respect to the lower rudder part 16.
층류화유도부(225)는 상부러더부(11)의 일측면(11a)으로 유입되는 회전입사류를 층류화 할 수 있도록, 상부러더부(11)의 일측면(11a)에 대해 돌출되며 후방으로 갈수록 프로펠러(5)의 축선상(a)에 대해 멀어지게 상방 측으로 편향된 제1층류화부(226)와, 하부러더부(16)의 타측면(16b)으로 유입되는 회전입사류를 층류화 할 수 있도록, 하부러더부(16)의 타측면(16b)에 대해 돌출되며 후방으로 갈수록 프로펠러(5)의 축선상(a)에 대해 멀어지게 하방 측으로 편향되게 형성된 제2층류화부(228)을 구비한다. The laminar flow induction part 225 protrudes from one side 11a of the upper rudder 11 and is rearward so that the rotational incident flow flowing into the one side 11a of the upper rudder 11 can be laminarized. Increasingly, the first laminar flow unit 226 deflected upwardly away from the axial line (a) of the propeller 5 and the rotational incident flow flowing into the other side (16b) of the lower rudder unit 16 can be laminarized. Thus, it has a second laminar flow portion 228 formed to protrude from the other side (16b) of the lower rudder portion (16) and deflect downwardly to be further away from the axial line (a) of the propeller (5). .
즉, 층류화유도부(225)의 일측부는 후단으로 갈수록 상방으로 편향되게 형성되며, 타측부는 후단으로 갈수록 하방으로 편향되게 형성된다.That is, one side of the laminar flow induction part 225 is formed to be deflected upward toward the rear end, and the other side is formed to be deflected downward toward the rear end.
본 발명의 제3실시 예에 따른 러더벌브를 포함하는 선박용 방향타(210)는 양측이 비대칭형상으로 형성된 러더벌브의 층류화유도부(225)에 의해, 상방에서 하방향으로 경사지게 발생되는 회전입사류와 하방에서 상방으로 경사지게 발생되는 회전입사류가 층류화 유도되므로 캐비테이션 감소 및 선박의 추진력이 향상될 수 있는 이점이 있다.The rudder for a ship 210 including the rudder bulb according to the third embodiment of the present invention is formed by the laminar flow induction part 225 of the rudder bulb formed in an asymmetric shape on both sides, Since the rotational incident flow that is generated obliquely from the bottom to the top is induced to become laminar, there is an advantage that cavitation can be reduced and the propulsive power of the ship can be improved.
한편, 도 8에는 본 발명의 제4실시 예에 따른 러더벌브를 포함하는 선박용 방향타(310)가 도시되어 있다.Meanwhile, FIG. 8 shows a rudder 310 for a ship including a ruther bulb according to a fourth embodiment of the present invention.
본 발명의 제3실시 예에 따른 러더벌브를 포함하는 선박용 방향타(310)는 러더벌브(321)의 형상을 제외하고 본 발명의 제1실시 예에 따른 선박용 방향타(10)의 구조와 동일하다.A ship rudder 310 including a rudder bulb according to the third embodiment of the present invention is the same as the structure of the ship rudder 10 according to the first embodiment of the present invention except for the shape of the rudder bulb 321.
러더벌브(321)는 회전입사류의 층류화를 위하여 러더스톡(3)이 장착되는 위치의 상부러더부(11)와 하부러더부(16)의 각 면 대해 양측으로 돌출되는 직경을 갖는다.The rudder bulb 321 has a diameter protruding to both sides with respect to each side of the upper rudder part 11 and the lower rudder part 16 at a position where the rudder stock 3 is mounted for laminar flow of rotational incident flow.
도 8을 참고하면, 러더벌브(321)는 벌브헤드부(26)와, 벌브본체부(322)를 구비하며, 벌브본체부(322)는 상부러더부(11)와 하부러더부(16)의 전단부에 대해 프로펠러(5) 방향으로 캡(7)과 동일한 직경으로 연장된 메인본체부(223)와, 메인본체부(223)에서 후방으로 연장되어 상부러더부(11)와 하부러더부(16)에 대해 양측으로 돌출된 층류화유도부(325)를 구비한다.Referring to FIG. 8, the rudder bulb 321 includes a bulb head portion 26 and a bulb body portion 322, and the bulb body portion 322 includes an upper rudder portion 11 and a lower rudder portion 16. With respect to the front end of the main body portion 223 extending in the same diameter as the cap 7 in the direction of the propeller 5, and extending rearward from the main body portion 223, the upper rudder portion 11 and the lower rudder portion It has a laminar flow induction part 325 protruding to both sides with respect to (16).
층류화유도부(325)는 양측 후단 중심측이 축선상(a)에 위치되게 양측이 대칭되게 형성되며, 하부층류화유도부(326)와 상부층류화유도부(328)를 구비한다.The laminar flow induction unit 325 is formed to be symmetrical on both sides such that the center sides of both rear ends are located on the axis (a), and includes a lower laminar flow induction unit 326 and an upper laminar flow induction unit 328.
하부층류화유도부(326)는 상부러더부(11)와 하부러더부(16)의 일측에 대해 돌출되되 하부로 갈수록 하부러더부(16)에 대해 돌출된 길이가 커지도록 횡단면이 하방으로 편향되게 볼록하게 형성된다.The lower laminar flow induction part 326 protrudes from one side of the upper rudder part 11 and the lower rudder part 16, but the cross section is convex downward so that the protruding length with respect to the lower rudder part 16 increases as it goes downward. Is formed.
하부층류화유도부(326)는 하부러더부(16)의 전단부(17)가 편향됨에 따라 하부러더부(16)의 타측면(16b) 보다 곡률이 큰 하부러더부(16)의 일측면(16a)을 타고 후방으로 흐르는 유체를 층류화 유도한다.The lower laminar flow induction part 326 has one side 16a of the lower rudder part 16 having a higher curvature than the other side 16b of the lower rudder part 16 as the front end 17 of the lower rudder part 16 is deflected. ) To induce laminar flow of the fluid flowing backwards.
상부층류화유도부(328)는 상부러더부(11)와 하부러더부(16)의 타측에 대해 돌출되되 상부로 갈수록 상부러더부(11)에 대해 돌출된 길이가 커지도록 횡단면이 상방으로 편향되게 볼록하게 형성된다. The upper laminar flow induction part 328 protrudes from the other side of the upper rudder part 11 and the lower rudder part 16, but the cross section is convex so that the protruding length with respect to the upper rudder part 11 increases as it goes upward. Is formed.
상부층류화유도부(328)는 상부러더부(11)의 전단부(12)가 편향됨에 따라 상부러더부(11)의 일측면(11a) 보다 곡률이 큰 상부러더부(11)의 타측면(11b)을 타고 후방으로 흐르는 유체를 층류화 유도한다.The upper laminar flow induction part 328 is the other side 11b of the upper rudder part 11 having a higher curvature than the one side 11a of the upper rudder part 11 as the front end 12 of the upper rudder part 11 is deflected. ) To induce laminar flow of the fluid flowing backwards.
그리고, 하부층류화유도부(326)와 상부층류화유도부(328)는 도 8에 도시된 바와 같이 메인본체부(223) 보다 양측으로 돌출형성되는 것이 바람직하며, 메인본체부(223)의 단부에서 후방으로 갈수록 점차적으로 메인본체부(223)보다 돌출된 길이가 연장되어 메인본체부(223)와 곡면 형태로 연장되는 것이 바람직하다. In addition, the lower laminar flow induction part 326 and the upper laminar flow induction part 328 are preferably formed to protrude toward both sides than the main body part 223 as shown in FIG. 8, and from the end of the main body part 223 to the rear. It is preferable that the length protruding from the main body portion 223 gradually extends gradually so as to extend in a curved shape with the main body portion 223.
본 발명의 제4 실시 예에 따른 러더벌브를 포함하는 선박용 방향타(310)는 러더벌브(321)의 상부층류화유도부와 하부층류화유도부가 비대칭 형상으로 돌출되어, 상부러더부(11)의 굴곡이 큰 타측면(11b)과 하부러더부(16)의 굴곡이 큰 일측면(16a)을 타고 흐르는 유체의 층류화되는 양을 보다 많이 확보할 수 있어 추진력이 향상될 수 있다.In the ship rudder 310 including the rudder bulb according to the fourth embodiment of the present invention, the upper laminar flow induction part and the lower laminar flow induction part of the rudder bulb 321 protrude in an asymmetric shape, so that the upper rudder part 11 has a large curvature. It is possible to secure a greater amount of laminar flow of the fluid flowing along the side surface 16a having a large curvature of the other side 11b and the lower rudder unit 16, so that the driving force may be improved.
이상에서 설명한 본 발명에 따른 러더벌브를 포함하는 선박용 방향타는 도면에 도시된 일 예를 참조로 설명하였으나 이는 예시적인 것에 불과하며, 당해 기술분야에서 통상의 지식을 가진자라면 이로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 점을 이해할 것이다. 따라서 본 발명의 진정한 기술적 보호의 범위는 첨부된 청구범위의 기술적 사상에 의해서 정해져야 할 것이다.The rudder for a ship including a rutherbulb according to the present invention described above has been described with reference to an example shown in the drawings, but this is only exemplary, and various modifications and equivalents therefrom are those of ordinary skill in the art. It will be appreciated that other embodiments are possible. Therefore, the scope of the true technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims (4)

  1. 선박의 후미에 프로펠러의 후방에 설치되어 상기 선박의 후미에 장착되는 러더스톡의 회전방향을 따라 회전되어 상기 선박의 이동방향을 조정하는 러더벌브를 포함한 선박용 방향타에 있어서, In the rudder for ships including a rudder bulb installed at the rear of the ship at the rear of the propeller and rotated along the rotational direction of the rudder stock mounted at the aft of the ship to adjust the moving direction of the ship,
    회전되는 상기 프로펠러의 회전에 의해 발생되는 회전 입사류에 대한 저항을 줄여 상기 프로펠러의 추진효율을 높일 수 있도록, 상기 회전 입사류 방향으로 편향되게 상기 프로펠러와 마주하는 전단측이 상기 프로펠러의 회전방향에 반대되는 방향을 향하는 상부러더부와; In order to increase the propulsion efficiency of the propeller by reducing the resistance to the rotational incident flow generated by the rotation of the rotating propeller, the front end side facing the propeller is deflected in the rotational incident flow direction in the rotational direction of the propeller. An upper rudder portion facing the opposite direction;
    상기 상부러더부의 하방에 위치되며, 상기 프로펠러와 마주하는 전단측이 상기 프로펠러의 회전방향에 반대되는 방향을 향하도록 상기 러더스톡을 중심으로 상기 상부러더의 전단측에 엇갈리게 형성되는 하부러더부와;A lower rudder part positioned below the upper rudder part and formed to be staggered on a front end side of the upper rudder with the rudder stock as a center so that a front end side facing the propeller faces a direction opposite to the rotation direction of the propeller;
    상기 상기러더부의 하부와 상기 하부러더부의 상부 사이에서 상기 프로펠러 방향으로 상기 프로펠러의 캡과 동일 직경으로 돌출된 러더벌브를 구비하는 것을 특징으로 하는 러더벌브를 포함하는 선박용 방향타.A rudder for a ship comprising a rudder bulb, comprising a rudder bulb protruding from a lower portion of the rudder portion and an upper portion of the lower rudder portion in the propeller direction with the same diameter as the cap of the propeller.
  2. 제 1항이 있어서, The method of claim 1,
    상기 상부러더부의 전단부는 상부에서 하방으로 수직하방으로 연장되다 하부가 상기 러더벌브의 외주면의 일측부로 접하도록 상기 프로펠러의 축선상에 대해 멀어지는 방향인 외측방향으로 곡선형태로 비틀어지게 형성되며,The front end portion of the upper rudder part is formed to be twisted in a curved shape in a direction away from the axial line of the propeller so that the front end part extends vertically downward from the top and the lower part contacts one side of the outer circumferential surface of the rudder bulb,
    상기 하부러더의 전단부는 하부에서 수직상방으로 연장되다 상부가 상기 러더벌브의 외주면의 타측부로 접하도록 상기 축선상에 대해 멀어지는 방향인 외측방향으로 곡선형태로 비틀어지게 형성되는 것을 특징으로 하는 러더벌브를 포함하는 선박용 방향타.The front end of the lower rudder is formed to be twisted in a curved shape in a direction away from the axial line so that the front end of the lower rudder extends vertically upward and the upper part contacts the other side of the outer circumferential surface of the rudder bulb. Ship rudder comprising a.
  3. 제 1항에 있어서, 상기 러더벌브는The method of claim 1, wherein the ruther bulb
    회전입사류의 층류화를 위하여 상기 러더스톡이 장착되는 위치의 상기 상부러더부와 상기 하부러더부의 각 면 대해 양측으로 돌출되는 직경을 가지되, For the laminar flow of the rotational incident flow, the upper and lower rudder parts at the positions where the rudder stock is mounted have a diameter protruding to both sides,
    상기 상부러더부의 일측면으로 유입되는 회전입사류를 층류화 할 수 있도록 돌출된 일측부가 후방으로 갈수록 상기 프로펠러의 축선상에 대해 멀어지게 상방측으로 편향되고,One side protruding to laminarize the rotational incident flow flowing into one side of the upper rudder is deflected upwardly to be farther away from the axial line of the propeller as it goes to the rear,
    상기 하부러더부의 타측면으로 유입되는 회전입사류를 층류화 할 수 있도록돌출된 타측부는 후방으로 갈수록 상기 프로펠러의 축선상에 대해 멀어지게 하방측으로 편향되게 형성되는 것을 특징으로 하는 러더벌브를 포함하는 선박용 방향타.Including a rudder bulb, characterized in that the protruding other side portion is formed to be deflected downwardly to be further away from the axial line of the propeller toward the rear so as to laminize the rotational incident flow flowing into the other side of the lower rudder portion. Marine rudder.
  4. 제1항에 있어서, 상기 러더벌브는The method of claim 1, wherein the ruther bulb
    상기 상기러더부의 하부와 상기 하부러더부의 상부 사이에서 상기 프로펠러방향으로 돌출된 연장된 원통형상의 벌브본체부와, 상기 벌브본체부의 단부에서 상기 프로펠러의 캡 방향으로 반구형상으로 돌출되어 상기 프로펠러의 캡과 마주하는 벌브헤드부를 구비하고,An extended cylindrical bulb body part protruding in the propeller direction between the lower part of the rudder part and the upper part of the lower rudder part, and a hemispherical shape protruding in the direction of the cap of the propeller from the end of the bulb body part to the cap of the propeller It has a bulb head facing each other,
    상기 벌브본체부는The bulb body part
    상기 상부러더부와 상기 하부러더부의 전단부에 대해 상기 프로펠러 방향으로 상기 캡과 동일한 직경으로 연장된 메인본체부와, 상기 메인본체부에서 후방으로 연장되어 상기 상부러더부와 상기 하부러더부에 대해 양측으로 돌출된 층류화유도부를 구비하고,A main body portion extending with the same diameter as the cap in a direction of the propeller with respect to a front end portion of the upper and lower rudder portions, and a rearward extending from the main body portion to the upper and lower rudder portions. It has a laminar flow induction part protruding to both sides,
    상기 층류화유도부는The laminar flow induction part
    상기 상부러더부와 상기 하부러더부의 일측에 대해 돌출되되 하부로 갈수록 상기 하부러더부에 대해 돌출된 길이가 커지도록 횡단면이 하방으로 편향되게 볼록한 하부층류화유도부와,A lower laminar flow induction part protruding from one side of the upper rudder part and the lower rudder part, but having a convex cross-section so as to be deflected downward so that the protruding length of the lower rudder part increases toward a lower part,
    상기 상부러더부와 상기 하부러더부의 타측에 대해 돌출되되 상부로 갈수록 상기 상부러더부에 대해 돌출된 길이가 커지도록 횡단면이 상방으로 편향되게 볼록한 상부층류화유도부를 구비하는 것을 특징으로 하는 러더벌브를 포함하는 선박용 방향타A rudder bulb comprising a rudder bulb, characterized in that it has a convex upper laminar flow induction part protruding from the other side of the upper rudder part and the lower rudder part, but having a convex cross-section so as to increase the protruding length of the upper rudder part as it goes upward. Ship rudder
PCT/KR2019/011063 2019-08-29 2019-08-29 Rudder for ship, comprising rudder bulb WO2021040090A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010009112A (en) * 1999-07-07 2001-02-05 권상문 A rudder of ship
KR20120140370A (en) * 2011-06-21 2012-12-31 대우조선해양 주식회사 Rudder of ship
JP2013107522A (en) * 2011-11-22 2013-06-06 Nippon Yusen Kk Rudder valve and rudder for ship
KR20140075929A (en) * 2012-12-11 2014-06-20 현대중공업 주식회사 Rudder bulb structure for ship
KR20170049127A (en) * 2015-10-28 2017-05-10 현대중공업 주식회사 A ship

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010009112A (en) * 1999-07-07 2001-02-05 권상문 A rudder of ship
KR20120140370A (en) * 2011-06-21 2012-12-31 대우조선해양 주식회사 Rudder of ship
JP2013107522A (en) * 2011-11-22 2013-06-06 Nippon Yusen Kk Rudder valve and rudder for ship
KR20140075929A (en) * 2012-12-11 2014-06-20 현대중공업 주식회사 Rudder bulb structure for ship
KR20170049127A (en) * 2015-10-28 2017-05-10 현대중공업 주식회사 A ship

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